summaryrefslogtreecommitdiffstats
path: root/drivers/net/irda/irda-usb.c
blob: 205e4e825a97639320d1898995e2de52368aefb2 (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
/*****************************************************************************
 *
 * Filename:      irda-usb.c
 * Version:       0.10
 * Description:   IrDA-USB Driver
 * Status:        Experimental 
 * Author:        Dag Brattli <dag@brattli.net>
 *
 *	Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
 *      Copyright (C) 2001, Dag Brattli <dag@brattli.net>
 *      Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
 *      Copyright (C) 2004, SigmaTel, Inc. <irquality@sigmatel.com>
 *      Copyright (C) 2005, Milan Beno <beno@pobox.sk>
 *      Copyright (C) 2006, Nick Fedchik <nick@fedchik.org.ua>
 *          
 *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *****************************************************************************/

/*
 *			    IMPORTANT NOTE
 *			    --------------
 *
 * As of kernel 2.5.20, this is the state of compliance and testing of
 * this driver (irda-usb) with regards to the USB low level drivers...
 *
 * This driver has been tested SUCCESSFULLY with the following drivers :
 *	o usb-uhci-hcd	(For Intel/Via USB controllers)
 *	o uhci-hcd	(Alternate/JE driver for Intel/Via USB controllers)
 *	o ohci-hcd	(For other USB controllers)
 *
 * This driver has NOT been tested with the following drivers :
 *	o ehci-hcd	(USB 2.0 controllers)
 *
 * Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
 * so we don't have to worry about that anymore.
 * One common problem is the failure to set the address on the dongle,
 * but this happens before the driver gets loaded...
 *
 * Jean II
 */

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

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/usb.h>
#include <linux/firmware.h>

#include "irda-usb.h"

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

static int qos_mtt_bits = 0;

/* These are the currently known IrDA USB dongles. Add new dongles here */
static struct usb_device_id dongles[] = {
	/* ACTiSYS Corp.,  ACT-IR2000U FIR-USB Adapter */
	{ USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
	/* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
	{ USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
	/* KC Technology Inc.,  KC-180 USB IrDA Device */
	{ USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
	/* Extended Systems, Inc.,  XTNDAccess IrDA USB (ESI-9685) */
	{ USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
	/* SigmaTel STIR4210/4220/4116 USB IrDA (VFIR) Bridge */
	{ USB_DEVICE(0x66f, 0x4210), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
	{ USB_DEVICE(0x66f, 0x4220), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
	{ USB_DEVICE(0x66f, 0x4116), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
	{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
	  USB_DEVICE_ID_MATCH_INT_SUBCLASS,
	  .bInterfaceClass = USB_CLASS_APP_SPEC,
	  .bInterfaceSubClass = USB_CLASS_IRDA,
	  .driver_info = IUC_DEFAULT, },
	{ }, /* The end */
};

/*
 * Important note :
 * Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
 * using the "USB-IrDA specification" (yes, there exist such a thing), and
 * therefore not supported by this driver (don't add them above).
 * There is a Linux driver, stir4200, that support those USB devices.
 * Jean II
 */

MODULE_DEVICE_TABLE(usb, dongles);

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

static void irda_usb_init_qos(struct irda_usb_cb *self) ;
static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
static void irda_usb_disconnect(struct usb_interface *intf);
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *dev);
static int irda_usb_open(struct irda_usb_cb *self);
static void irda_usb_close(struct irda_usb_cb *self);
static void speed_bulk_callback(struct urb *urb);
static void write_bulk_callback(struct urb *urb);
static void irda_usb_receive(struct urb *urb);
static void irda_usb_rx_defer_expired(unsigned long data);
static int irda_usb_net_open(struct net_device *dev);
static int irda_usb_net_close(struct net_device *dev);
static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static void irda_usb_net_timeout(struct net_device *dev);
static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev);

/************************ TRANSMIT ROUTINES ************************/
/*
 * Receive packets from the IrDA stack and send them on the USB pipe.
 * Handle speed change, timeout and lot's of ugliness...
 */

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_build_header(self, skb, header)
 *
 *   Builds USB-IrDA outbound header
 *
 * When we send an IrDA frame over an USB pipe, we add to it a 1 byte
 * header. This function create this header with the proper values.
 *
 * Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
 * that the setting of the link speed and xbof number in this outbound header
 * should be applied *AFTER* the frame has been sent.
 * Unfortunately, some devices are not compliant with that... It seems that
 * reading the spec is far too difficult...
 * Jean II
 */
static void irda_usb_build_header(struct irda_usb_cb *self,
				  __u8 *header,
				  int	force)
{
	/* Here we check if we have an STIR421x chip,
	 * and if either speed or xbofs (or both) needs
	 * to be changed.
	 */
	if (self->capability & IUC_STIR421X &&
	    ((self->new_speed != -1) || (self->new_xbofs != -1))) {

		/* With STIR421x, speed and xBOFs must be set at the same
		 * time, even if only one of them changes.
		 */
		if (self->new_speed == -1)
			self->new_speed = self->speed ;

		if (self->new_xbofs == -1)
			self->new_xbofs = self->xbofs ;
	}

	/* Set the link speed */
	if (self->new_speed != -1) {
		/* Hum... Ugly hack :-(
		 * Some device are not compliant with the spec and change
		 * parameters *before* sending the frame. - Jean II
		 */
		if ((self->capability & IUC_SPEED_BUG) &&
		    (!force) && (self->speed != -1)) {
			/* No speed and xbofs change here
			 * (we'll do it later in the write callback) */
			IRDA_DEBUG(2, "%s(), not changing speed yet\n", __func__);
			*header = 0;
			return;
		}

		IRDA_DEBUG(2, "%s(), changing speed to %d\n", __func__, self->new_speed);
		self->speed = self->new_speed;
		/* We will do ` self->new_speed = -1; ' in the completion
		 * handler just in case the current URB fail - Jean II */

		switch (self->speed) {
		case 2400:
		        *header = SPEED_2400;
			break;
		default:
		case 9600:
			*header = SPEED_9600;
			break;
		case 19200:
			*header = SPEED_19200;
			break;
		case 38400:
			*header = SPEED_38400;
			break;
		case 57600:
		        *header = SPEED_57600;
			break;
		case 115200:
		        *header = SPEED_115200;
			break;
		case 576000:
		        *header = SPEED_576000;
			break;
		case 1152000:
		        *header = SPEED_1152000;
			break;
		case 4000000:
		        *header = SPEED_4000000;
			self->new_xbofs = 0;
			break;
		case 16000000:
			*header = SPEED_16000000;
  			self->new_xbofs = 0;
  			break;
  		}
	} else
		/* No change */
		*header = 0;
	
	/* Set the negotiated additional XBOFS */
	if (self->new_xbofs != -1) {
		IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __func__, self->new_xbofs);
		self->xbofs = self->new_xbofs;
		/* We will do ` self->new_xbofs = -1; ' in the completion
		 * handler just in case the current URB fail - Jean II */

		switch (self->xbofs) {
		case 48:
			*header |= 0x10;
			break;
		case 28:
		case 24:	/* USB spec 1.0 says 24 */
			*header |= 0x20;
			break;
		default:
		case 12:
			*header |= 0x30;
			break;
		case 5: /* Bug in IrLAP spec? (should be 6) */
		case 6:
			*header |= 0x40;
			break;
		case 3:
			*header |= 0x50;
			break;
		case 2:
			*header |= 0x60;
			break;
		case 1:
			*header |= 0x70;
			break;
		case 0:
			*header |= 0x80;
			break;
		}
	}
}

/*
*   calculate turnaround time for SigmaTel header
*/
static __u8 get_turnaround_time(struct sk_buff *skb)
{
	int turnaround_time = irda_get_mtt(skb);

	if ( turnaround_time == 0 )
		return 0;
	else if ( turnaround_time <= 10 )
		return 1;
	else if ( turnaround_time <= 50 )
		return 2;
	else if ( turnaround_time <= 100 )
		return 3;
	else if ( turnaround_time <= 500 )
		return 4;
	else if ( turnaround_time <= 1000 )
		return 5;
	else if ( turnaround_time <= 5000 )
		return 6;
	else
		return 7;
}


/*------------------------------------------------------------------*/
/*
 * Send a command to change the speed of the dongle
 * Need to be called with spinlock on.
 */
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
{
	__u8 *frame;
	struct urb *urb;
	int ret;

	IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __func__,
		   self->new_speed, self->new_xbofs);

	/* Grab the speed URB */
	urb = self->speed_urb;
	if (urb->status != 0) {
		IRDA_WARNING("%s(), URB still in use!\n", __func__);
		return;
	}

	/* Allocate the fake frame */
	frame = self->speed_buff;

	/* Set the new speed and xbofs in this fake frame */
	irda_usb_build_header(self, frame, 1);

	if (self->capability & IUC_STIR421X) {
		if (frame[0] == 0) return ; // do nothing if no change
		frame[1] = 0; // other parameters don't change here
		frame[2] = 0;
	}

	/* Submit the 0 length IrDA frame to trigger new speed settings */
        usb_fill_bulk_urb(urb, self->usbdev,
		      usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
                      frame, IRDA_USB_SPEED_MTU,
                      speed_bulk_callback, self);
	urb->transfer_buffer_length = self->header_length;
	urb->transfer_flags = 0;

	/* Irq disabled -> GFP_ATOMIC */
	if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
		IRDA_WARNING("%s(), failed Speed URB\n", __func__);
	}
}

/*------------------------------------------------------------------*/
/*
 * Speed URB callback
 * Now, we can only get called for the speed URB.
 */
static void speed_bulk_callback(struct urb *urb)
{
	struct irda_usb_cb *self = urb->context;
	
	IRDA_DEBUG(2, "%s()\n", __func__);

	/* We should always have a context */
	IRDA_ASSERT(self != NULL, return;);
	/* We should always be called for the speed URB */
	IRDA_ASSERT(urb == self->speed_urb, return;);

	/* Check for timeout and other USB nasties */
	if (urb->status != 0) {
		/* I get a lot of -ECONNABORTED = -103 here - Jean II */
		IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __func__, urb->status, urb->transfer_flags);

		/* Don't do anything here, that might confuse the USB layer.
		 * Instead, we will wait for irda_usb_net_timeout(), the
		 * network layer watchdog, to fix the situation.
		 * Jean II */
		/* A reset of the dongle might be welcomed here - Jean II */
		return;
	}

	/* urb is now available */
	//urb->status = 0; -> tested above

	/* New speed and xbof is now commited in hardware */
	self->new_speed = -1;
	self->new_xbofs = -1;

	/* Allow the stack to send more packets */
	netif_wake_queue(self->netdev);
}

/*------------------------------------------------------------------*/
/*
 * Send an IrDA frame to the USB dongle (for transmission)
 */
static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	struct irda_usb_cb *self = netdev_priv(netdev);
	struct urb *urb = self->tx_urb;
	unsigned long flags;
	s32 speed;
	s16 xbofs;
	int res, mtt;
	int	err = 1;	/* Failed */

	IRDA_DEBUG(4, "%s() on %s\n", __func__, netdev->name);

	netif_stop_queue(netdev);

	/* Protect us from USB callbacks, net watchdog and else. */
	spin_lock_irqsave(&self->lock, flags);

	/* Check if the device is still there.
	 * We need to check self->present under the spinlock because
	 * of irda_usb_disconnect() is synchronous - Jean II */
	if (!self->present) {
		IRDA_DEBUG(0, "%s(), Device is gone...\n", __func__);
		goto drop;
	}

	/* Check if we need to change the number of xbofs */
        xbofs = irda_get_next_xbofs(skb);
        if ((xbofs != self->xbofs) && (xbofs != -1)) {
		self->new_xbofs = xbofs;
	}

        /* Check if we need to change the speed */
	speed = irda_get_next_speed(skb);
	if ((speed != self->speed) && (speed != -1)) {
		/* Set the desired speed */
		self->new_speed = speed;

		/* Check for empty frame */
		if (!skb->len) {
			/* IrLAP send us an empty frame to make us change the
			 * speed. Changing speed with the USB adapter is in
			 * fact sending an empty frame to the adapter, so we
			 * could just let the present function do its job.
			 * However, we would wait for min turn time,
			 * do an extra memcpy and increment packet counters...
			 * Jean II */
			irda_usb_change_speed_xbofs(self);
			netdev->trans_start = jiffies;
			/* Will netif_wake_queue() in callback */
			err = 0;	/* No error */
			goto drop;
		}
	}

	if (urb->status != 0) {
		IRDA_WARNING("%s(), URB still in use!\n", __func__);
		goto drop;
	}

	skb_copy_from_linear_data(skb, self->tx_buff + self->header_length, skb->len);

	/* Change setting for next frame */
	if (self->capability & IUC_STIR421X) {
		__u8 turnaround_time;
		__u8* frame = self->tx_buff;
		turnaround_time = get_turnaround_time( skb );
		irda_usb_build_header(self, frame, 0);
		frame[2] = turnaround_time;
		if ((skb->len != 0) &&
		    ((skb->len % 128) == 0) &&
		    ((skb->len % 512) != 0)) {
			/* add extra byte for special SigmaTel feature */
			frame[1] = 1;
			skb_put(skb, 1);
		} else {
			frame[1] = 0;
		}
	} else {
		irda_usb_build_header(self, self->tx_buff, 0);
	}

	/* FIXME: Make macro out of this one */
	((struct irda_skb_cb *)skb->cb)->context = self;

	usb_fill_bulk_urb(urb, self->usbdev,
		      usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
                      self->tx_buff, skb->len + self->header_length,
                      write_bulk_callback, skb);

	/* This flag (URB_ZERO_PACKET) indicates that what we send is not
	 * a continuous stream of data but separate packets.
	 * In this case, the USB layer will insert an empty USB frame (TD)
	 * after each of our packets that is exact multiple of the frame size.
	 * This is how the dongle will detect the end of packet - Jean II */
	urb->transfer_flags = URB_ZERO_PACKET;

	/* Generate min turn time. FIXME: can we do better than this? */
	/* Trying to a turnaround time at this level is trying to measure
	 * processor clock cycle with a wrist-watch, approximate at best...
	 *
	 * What we know is the last time we received a frame over USB.
	 * Due to latency over USB that depend on the USB load, we don't
	 * know when this frame was received over IrDA (a few ms before ?)
	 * Then, same story for our outgoing frame...
	 *
	 * In theory, the USB dongle is supposed to handle the turnaround
	 * by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
	 * why this code is enabled only for dongles that doesn't meet
	 * the spec.
	 * Jean II */
	if (self->capability & IUC_NO_TURN) {
		mtt = irda_get_mtt(skb);
		if (mtt) {
			int diff;
			do_gettimeofday(&self->now);
			diff = self->now.tv_usec - self->stamp.tv_usec;
#ifdef IU_USB_MIN_RTT
			/* Factor in USB delays -> Get rid of udelay() that
			 * would be lost in the noise - Jean II */
			diff += IU_USB_MIN_RTT;
#endif /* IU_USB_MIN_RTT */
			/* If the usec counter did wraparound, the diff will
			 * go negative (tv_usec is a long), so we need to
			 * correct it by one second. Jean II */
			if (diff < 0)
				diff += 1000000;

		        /* Check if the mtt is larger than the time we have
			 * already used by all the protocol processing
			 */
			if (mtt > diff) {
				mtt -= diff;
				if (mtt > 1000)
					mdelay(mtt/1000);
				else
					udelay(mtt);
			}
		}
	}
	
	/* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
	if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
		IRDA_WARNING("%s(), failed Tx URB\n", __func__);
		self->stats.tx_errors++;
		/* Let USB recover : We will catch that in the watchdog */
		/*netif_start_queue(netdev);*/
	} else {
		/* Increment packet stats */
		self->stats.tx_packets++;
                self->stats.tx_bytes += skb->len;
		
		netdev->trans_start = jiffies;
	}
	spin_unlock_irqrestore(&self->lock, flags);
	
	return 0;

drop:
	/* Drop silently the skb and exit */
	dev_kfree_skb(skb);
	spin_unlock_irqrestore(&self->lock, flags);
	return err;		/* Usually 1 */
}

/*------------------------------------------------------------------*/
/*
 * Note : this function will be called only for tx_urb...
 */
static void write_bulk_callback(struct urb *urb)
{
	unsigned long flags;
	struct sk_buff *skb = urb->context;
	struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
	
	IRDA_DEBUG(2, "%s()\n", __func__);

	/* We should always have a context */
	IRDA_ASSERT(self != NULL, return;);
	/* We should always be called for the speed URB */
	IRDA_ASSERT(urb == self->tx_urb, return;);

	/* Free up the skb */
	dev_kfree_skb_any(skb);
	urb->context = NULL;

	/* Check for timeout and other USB nasties */
	if (urb->status != 0) {
		/* I get a lot of -ECONNABORTED = -103 here - Jean II */
		IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __func__, urb->status, urb->transfer_flags);

		/* Don't do anything here, that might confuse the USB layer,
		 * and we could go in recursion and blow the kernel stack...
		 * Instead, we will wait for irda_usb_net_timeout(), the
		 * network layer watchdog, to fix the situation.
		 * Jean II */
		/* A reset of the dongle might be welcomed here - Jean II */
		return;
	}

	/* urb is now available */
	//urb->status = 0; -> tested above

	/* Make sure we read self->present properly */
	spin_lock_irqsave(&self->lock, flags);

	/* If the network is closed, stop everything */
	if ((!self->netopen) || (!self->present)) {
		IRDA_DEBUG(0, "%s(), Network is gone...\n", __func__);
		spin_unlock_irqrestore(&self->lock, flags);
		return;
	}

	/* If changes to speed or xbofs is pending... */
	if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
		if ((self->new_speed != self->speed) ||
		    (self->new_xbofs != self->xbofs)) {
			/* We haven't changed speed yet (because of
			 * IUC_SPEED_BUG), so do it now - Jean II */
			IRDA_DEBUG(1, "%s(), Changing speed now...\n", __func__);
			irda_usb_change_speed_xbofs(self);
		} else {
			/* New speed and xbof is now commited in hardware */
			self->new_speed = -1;
			self->new_xbofs = -1;
			/* Done, waiting for next packet */
			netif_wake_queue(self->netdev);
		}
	} else {
		/* Otherwise, allow the stack to send more packets */
		netif_wake_queue(self->netdev);
	}
	spin_unlock_irqrestore(&self->lock, flags);
}

/*------------------------------------------------------------------*/
/*
 * Watchdog timer from the network layer.
 * After a predetermined timeout, if we don't give confirmation that
 * the packet has been sent (i.e. no call to netif_wake_queue()),
 * the network layer will call this function.
 * Note that URB that we submit have also a timeout. When the URB timeout
 * expire, the normal URB callback is called (write_bulk_callback()).
 */
static void irda_usb_net_timeout(struct net_device *netdev)
{
	unsigned long flags;
	struct irda_usb_cb *self = netdev_priv(netdev);
	struct urb *urb;
	int	done = 0;	/* If we have made any progress */

	IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __func__);
	IRDA_ASSERT(self != NULL, return;);

	/* Protect us from USB callbacks, net Tx and else. */
	spin_lock_irqsave(&self->lock, flags);

	/* self->present *MUST* be read under spinlock */
	if (!self->present) {
		IRDA_WARNING("%s(), device not present!\n", __func__);
		netif_stop_queue(netdev);
		spin_unlock_irqrestore(&self->lock, flags);
		return;
	}

	/* Check speed URB */
	urb = self->speed_urb;
	if (urb->status != 0) {
		IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);

		switch (urb->status) {
		case -EINPROGRESS:
			usb_unlink_urb(urb);
			/* Note : above will  *NOT* call netif_wake_queue()
			 * in completion handler, we will come back here.
			 * Jean II */
			done = 1;
			break;
		case -ECONNRESET:
		case -ENOENT:			/* urb unlinked by us */
		default:			/* ??? - Play safe */
			urb->status = 0;
			netif_wake_queue(self->netdev);
			done = 1;
			break;
		}
	}

	/* Check Tx URB */
	urb = self->tx_urb;
	if (urb->status != 0) {
		struct sk_buff *skb = urb->context;

		IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);

		/* Increase error count */
		self->stats.tx_errors++;

#ifdef IU_BUG_KICK_TIMEOUT
		/* Can't be a bad idea to reset the speed ;-) - Jean II */
		if(self->new_speed == -1)
			self->new_speed = self->speed;
		if(self->new_xbofs == -1)
			self->new_xbofs = self->xbofs;
		irda_usb_change_speed_xbofs(self);
#endif /* IU_BUG_KICK_TIMEOUT */

		switch (urb->status) {
		case -EINPROGRESS:
			usb_unlink_urb(urb);
			/* Note : above will  *NOT* call netif_wake_queue()
			 * in completion handler, because urb->status will
			 * be -ENOENT. We will fix that at the next watchdog,
			 * leaving more time to USB to recover...
			 * Jean II */
			done = 1;
			break;
		case -ECONNRESET:
		case -ENOENT:			/* urb unlinked by us */
		default:			/* ??? - Play safe */
			if(skb != NULL) {
				dev_kfree_skb_any(skb);
				urb->context = NULL;
			}
			urb->status = 0;
			netif_wake_queue(self->netdev);
			done = 1;
			break;
		}
	}
	spin_unlock_irqrestore(&self->lock, flags);

	/* Maybe we need a reset */
	/* Note : Some drivers seem to use a usb_set_interface() when they
	 * need to reset the hardware. Hum...
	 */

	/* if(done == 0) */
}

/************************* RECEIVE ROUTINES *************************/
/*
 * Receive packets from the USB layer stack and pass them to the IrDA stack.
 * Try to work around USB failures...
 */

/*
 * Note :
 * Some of you may have noticed that most dongle have an interrupt in pipe
 * that we don't use. Here is the little secret...
 * When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
 * in every USB frame. This is unnecessary overhead.
 * The interrupt in pipe will generate an event every time a packet is
 * received. Reading an interrupt pipe adds minimal overhead, but has some
 * latency (~1ms).
 * If we are connected (speed != 9600), we want to minimise latency, so
 * we just always hang the Rx URB and ignore the interrupt.
 * If we are not connected (speed == 9600), there is usually no Rx traffic,
 * and we want to minimise the USB overhead. In this case we should wait
 * on the interrupt pipe and hang the Rx URB only when an interrupt is
 * received.
 * Jean II
 *
 * Note : don't read the above as what we are currently doing, but as
 * something we could do with KC dongle. Also don't forget that the
 * interrupt pipe is not part of the original standard, so this would
 * need to be optional...
 * Jean II
 */

/*------------------------------------------------------------------*/
/*
 * Submit a Rx URB to the USB layer to handle reception of a frame
 * Mostly called by the completion callback of the previous URB.
 *
 * Jean II
 */
static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
{
	struct irda_skb_cb *cb;
	int ret;

	IRDA_DEBUG(2, "%s()\n", __func__);

	/* This should never happen */
	IRDA_ASSERT(skb != NULL, return;);
	IRDA_ASSERT(urb != NULL, return;);

	/* Save ourselves in the skb */
	cb = (struct irda_skb_cb *) skb->cb;
	cb->context = self;

	/* Reinitialize URB */
	usb_fill_bulk_urb(urb, self->usbdev, 
		      usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep), 
		      skb->data, IRDA_SKB_MAX_MTU,
                      irda_usb_receive, skb);
	urb->status = 0;

	/* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret) {
		/* If this ever happen, we are in deep s***.
		 * Basically, the Rx path will stop... */
		IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
			     __func__, ret);
	}
}

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_receive(urb)
 *
 *     Called by the USB subsystem when a frame has been received
 *
 */
static void irda_usb_receive(struct urb *urb)
{
	struct sk_buff *skb = (struct sk_buff *) urb->context;
	struct irda_usb_cb *self; 
	struct irda_skb_cb *cb;
	struct sk_buff *newskb;
	struct sk_buff *dataskb;
	struct urb *next_urb;
	unsigned int len, docopy;

	IRDA_DEBUG(2, "%s(), len=%d\n", __func__, urb->actual_length);
	
	/* Find ourselves */
	cb = (struct irda_skb_cb *) skb->cb;
	IRDA_ASSERT(cb != NULL, return;);
	self = (struct irda_usb_cb *) cb->context;
	IRDA_ASSERT(self != NULL, return;);

	/* If the network is closed or the device gone, stop everything */
	if ((!self->netopen) || (!self->present)) {
		IRDA_DEBUG(0, "%s(), Network is gone!\n", __func__);
		/* Don't re-submit the URB : will stall the Rx path */
		return;
	}
	
	/* Check the status */
	if (urb->status != 0) {
		switch (urb->status) {
		case -EILSEQ:
			self->stats.rx_crc_errors++;	
			/* Also precursor to a hot-unplug on UHCI. */
			/* Fallthrough... */
		case -ECONNRESET:
			/* Random error, if I remember correctly */
			/* uhci_cleanup_unlink() is going to kill the Rx
			 * URB just after we return. No problem, at this
			 * point the URB will be idle ;-) - Jean II */
		case -ESHUTDOWN:
			/* That's usually a hot-unplug. Submit will fail... */
		case -ETIME:
			/* Usually precursor to a hot-unplug on OHCI. */
		default:
			self->stats.rx_errors++;
			IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X \n", __func__, urb->status, urb->transfer_flags);
			break;
		}
		/* If we received an error, we don't want to resubmit the
		 * Rx URB straight away but to give the USB layer a little
		 * bit of breathing room.
		 * We are in the USB thread context, therefore there is a
		 * danger of recursion (new URB we submit fails, we come
		 * back here).
		 * With recent USB stack (2.6.15+), I'm seeing that on
		 * hot unplug of the dongle...
		 * Lowest effective timer is 10ms...
		 * Jean II */
		self->rx_defer_timer.function = &irda_usb_rx_defer_expired;
		self->rx_defer_timer.data = (unsigned long) urb;
		mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
		return;
	}
	
	/* Check for empty frames */
	if (urb->actual_length <= self->header_length) {
		IRDA_WARNING("%s(), empty frame!\n", __func__);
		goto done;
	}

	/*  
	 * Remember the time we received this frame, so we can
	 * reduce the min turn time a bit since we will know
	 * how much time we have used for protocol processing
	 */
        do_gettimeofday(&self->stamp);

	/* Check if we need to copy the data to a new skb or not.
	 * For most frames, we use ZeroCopy and pass the already
	 * allocated skb up the stack.
	 * If the frame is small, it is more efficient to copy it
	 * to save memory (copy will be fast anyway - that's
	 * called Rx-copy-break). Jean II */
	docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);

	/* Allocate a new skb */
	if (self->capability & IUC_STIR421X)
		newskb = dev_alloc_skb(docopy ? urb->actual_length :
				       IRDA_SKB_MAX_MTU +
				       USB_IRDA_STIR421X_HEADER);
	else
		newskb = dev_alloc_skb(docopy ? urb->actual_length :
				       IRDA_SKB_MAX_MTU);

	if (!newskb)  {
		self->stats.rx_dropped++;
		/* We could deliver the current skb, but this would stall
		 * the Rx path. Better drop the packet... Jean II */
		goto done;  
	}

	/* Make sure IP header get aligned (IrDA header is 5 bytes) */
	/* But IrDA-USB header is 1 byte. Jean II */
	//skb_reserve(newskb, USB_IRDA_HEADER - 1);

	if(docopy) {
		/* Copy packet, so we can recycle the original */
		skb_copy_from_linear_data(skb, newskb->data, urb->actual_length);
		/* Deliver this new skb */
		dataskb = newskb;
		/* And hook the old skb to the URB
		 * Note : we don't need to "clean up" the old skb,
		 * as we never touched it. Jean II */
	} else {
		/* We are using ZeroCopy. Deliver old skb */
		dataskb = skb;
		/* And hook the new skb to the URB */
		skb = newskb;
	}

	/* Set proper length on skb & remove USB-IrDA header */
	skb_put(dataskb, urb->actual_length);
	skb_pull(dataskb, self->header_length);

	/* Ask the networking layer to queue the packet for the IrDA stack */
	dataskb->dev = self->netdev;
	skb_reset_mac_header(dataskb);
	dataskb->protocol = htons(ETH_P_IRDA);
	len = dataskb->len;
	netif_rx(dataskb);

	/* Keep stats up to date */
	self->stats.rx_bytes += len;
	self->stats.rx_packets++;

done:
	/* Note : at this point, the URB we've just received (urb)
	 * is still referenced by the USB layer. For example, if we
	 * have received a -ECONNRESET, uhci_cleanup_unlink() will
	 * continue to process it (in fact, cleaning it up).
	 * If we were to submit this URB, disaster would ensue.
	 * Therefore, we submit our idle URB, and put this URB in our
	 * idle slot....
	 * Jean II */
	/* Note : with this scheme, we could submit the idle URB before
	 * processing the Rx URB. I don't think it would buy us anything as
	 * we are running in the USB thread context. Jean II */
	next_urb = self->idle_rx_urb;

	/* Recycle Rx URB : Now, the idle URB is the present one */
	urb->context = NULL;
	self->idle_rx_urb = urb;

	/* Submit the idle URB to replace the URB we've just received.
	 * Do it last to avoid race conditions... Jean II */
	irda_usb_submit(self, skb, next_urb);
}

/*------------------------------------------------------------------*/
/*
 * In case of errors, we want the USB layer to have time to recover.
 * Now, it is time to resubmit ouur Rx URB...
 */
static void irda_usb_rx_defer_expired(unsigned long data)
{
	struct urb *urb = (struct urb *) data;
	struct sk_buff *skb = (struct sk_buff *) urb->context;
	struct irda_usb_cb *self; 
	struct irda_skb_cb *cb;
	struct urb *next_urb;

	IRDA_DEBUG(2, "%s()\n", __func__);

	/* Find ourselves */
	cb = (struct irda_skb_cb *) skb->cb;
	IRDA_ASSERT(cb != NULL, return;);
	self = (struct irda_usb_cb *) cb->context;
	IRDA_ASSERT(self != NULL, return;);

	/* Same stuff as when Rx is done, see above... */
	next_urb = self->idle_rx_urb;
	urb->context = NULL;
	self->idle_rx_urb = urb;
	irda_usb_submit(self, skb, next_urb);
}

/*------------------------------------------------------------------*/
/*
 * Callbak from IrDA layer. IrDA wants to know if we have
 * started receiving anything.
 */
static int irda_usb_is_receiving(struct irda_usb_cb *self)
{
	/* Note : because of the way UHCI works, it's almost impossible
	 * to get this info. The Controller DMA directly to memory and
	 * signal only when the whole frame is finished. To know if the
	 * first TD of the URB has been filled or not seems hard work...
	 *
	 * The other solution would be to use the "receiving" command
	 * on the default decriptor with a usb_control_msg(), but that
	 * would add USB traffic and would return result only in the
	 * next USB frame (~1ms).
	 *
	 * I've been told that current dongles send status info on their
	 * interrupt endpoint, and that's what the Windows driver uses
	 * to know this info. Unfortunately, this is not yet in the spec...
	 *
	 * Jean II
	 */

	return 0; /* For now */
}

#define STIR421X_PATCH_PRODUCT_VER     "Product Version: "
#define STIR421X_PATCH_STMP_TAG        "STMP"
#define STIR421X_PATCH_CODE_OFFSET     512 /* patch image starts before here */
/* marks end of patch file header (PC DOS text file EOF character) */
#define STIR421X_PATCH_END_OF_HDR_TAG  0x1A
#define STIR421X_PATCH_BLOCK_SIZE      1023

/*
 * Function stir421x_fwupload (struct irda_usb_cb *self,
 *                             unsigned char *patch,
 *                             const unsigned int patch_len)
 *
 *   Upload firmware code to SigmaTel 421X IRDA-USB dongle
 */
static int stir421x_fw_upload(struct irda_usb_cb *self,
			     const unsigned char *patch,
			     const unsigned int patch_len)
{
        int ret = -ENOMEM;
        int actual_len = 0;
        unsigned int i;
        unsigned int block_size = 0;
        unsigned char *patch_block;

        patch_block = kzalloc(STIR421X_PATCH_BLOCK_SIZE, GFP_KERNEL);
	if (patch_block == NULL)
		return -ENOMEM;

	/* break up patch into 1023-byte sections */
	for (i = 0; i < patch_len; i += block_size) {
		block_size = patch_len - i;

		if (block_size > STIR421X_PATCH_BLOCK_SIZE)
			block_size = STIR421X_PATCH_BLOCK_SIZE;

		/* upload the patch section */
		memcpy(patch_block, patch + i, block_size);

		ret = usb_bulk_msg(self->usbdev,
				   usb_sndbulkpipe(self->usbdev,
						   self->bulk_out_ep),
				   patch_block, block_size,
				   &actual_len, msecs_to_jiffies(500));
		IRDA_DEBUG(3,"%s(): Bulk send %u bytes, ret=%d\n",
			   __func__, actual_len, ret);

		if (ret < 0)
			break;

		mdelay(10);
	}

	kfree(patch_block);

        return ret;
 }

/*
 * Function stir421x_patch_device(struct irda_usb_cb *self)
 *
 * Get a firmware code from userspase using hotplug request_firmware() call
  */
static int stir421x_patch_device(struct irda_usb_cb *self)
{
	unsigned int i;
	int ret;
	char stir421x_fw_name[11];
	const struct firmware *fw;
	const unsigned char *fw_version_ptr; /* pointer to version string */
	unsigned long fw_version = 0;

        /*
         * Known firmware patch file names for STIR421x dongles
         * are "42101001.sb" or "42101002.sb"
         */
        sprintf(stir421x_fw_name, "4210%4X.sb",
                self->usbdev->descriptor.bcdDevice);
        ret = request_firmware(&fw, stir421x_fw_name, &self->usbdev->dev);
        if (ret < 0)
                return ret;

        /* We get a patch from userspace */
        IRDA_MESSAGE("%s(): Received firmware %s (%zu bytes)\n",
                     __func__, stir421x_fw_name, fw->size);

        ret = -EINVAL;

	/* Get the bcd product version */
        if (!memcmp(fw->data, STIR421X_PATCH_PRODUCT_VER,
                    sizeof(STIR421X_PATCH_PRODUCT_VER) - 1)) {
                fw_version_ptr = fw->data +
			sizeof(STIR421X_PATCH_PRODUCT_VER) - 1;

                /* Let's check if the product version is dotted */
                if (fw_version_ptr[3] == '.' &&
		    fw_version_ptr[7] == '.') {
			unsigned long major, minor, build;
			major = simple_strtoul(fw_version_ptr, NULL, 10);
			minor = simple_strtoul(fw_version_ptr + 4, NULL, 10);
			build = simple_strtoul(fw_version_ptr + 8, NULL, 10);

			fw_version = (major << 12)
				+ (minor << 8)
				+ ((build / 10) << 4)
				+ (build % 10);

			IRDA_DEBUG(3, "%s(): Firmware Product version %ld\n",
                                   __func__, fw_version);
                }
        }

        if (self->usbdev->descriptor.bcdDevice == cpu_to_le16(fw_version)) {
                /*
		 * If we're here, we've found a correct patch
                 * The actual image starts after the "STMP" keyword
                 * so forward to the firmware header tag
                 */
                for (i = 0; (fw->data[i] != STIR421X_PATCH_END_OF_HDR_TAG)
			     && (i < fw->size); i++) ;
                /* here we check for the out of buffer case */
                if ((STIR421X_PATCH_END_OF_HDR_TAG == fw->data[i])
                    && (i < STIR421X_PATCH_CODE_OFFSET)) {
                        if (!memcmp(fw->data + i + 1, STIR421X_PATCH_STMP_TAG,
                                    sizeof(STIR421X_PATCH_STMP_TAG) - 1)) {

				/* We can upload the patch to the target */
				i += sizeof(STIR421X_PATCH_STMP_TAG);
                                ret = stir421x_fw_upload(self, &fw->data[i],
							 fw->size - i);
                        }
                }
        }

        release_firmware(fw);

        return ret;
}


/********************** IRDA DEVICE CALLBACKS **********************/
/*
 * Main calls from the IrDA/Network subsystem.
 * Mostly registering a new irda-usb device and removing it....
 * We only deal with the IrDA side of the business, the USB side will
 * be dealt with below...
 */


/*------------------------------------------------------------------*/
/*
 * Function irda_usb_net_open (dev)
 *
 *    Network device is taken up. Usually this is done by "ifconfig irda0 up" 
 *   
 * Note : don't mess with self->netopen - Jean II
 */
static int irda_usb_net_open(struct net_device *netdev)
{
	struct irda_usb_cb *self;
	unsigned long flags;
	char	hwname[16];
	int i;
	
	IRDA_DEBUG(1, "%s()\n", __func__);

	IRDA_ASSERT(netdev != NULL, return -1;);
	self = netdev_priv(netdev);
	IRDA_ASSERT(self != NULL, return -1;);

	spin_lock_irqsave(&self->lock, flags);
	/* Can only open the device if it's there */
	if(!self->present) {
		spin_unlock_irqrestore(&self->lock, flags);
		IRDA_WARNING("%s(), device not present!\n", __func__);
		return -1;
	}

	if(self->needspatch) {
		spin_unlock_irqrestore(&self->lock, flags);
		IRDA_WARNING("%s(), device needs patch\n", __func__) ;
		return -EIO ;
	}

	/* Initialise default speed and xbofs value
	 * (IrLAP will change that soon) */
	self->speed = -1;
	self->xbofs = -1;
	self->new_speed = -1;
	self->new_xbofs = -1;

	/* To do *before* submitting Rx urbs and starting net Tx queue
	 * Jean II */
	self->netopen = 1;
	spin_unlock_irqrestore(&self->lock, flags);

	/* 
	 * Now that everything should be initialized properly,
	 * Open new IrLAP layer instance to take care of us...
	 * Note : will send immediately a speed change...
	 */
	sprintf(hwname, "usb#%d", self->usbdev->devnum);
	self->irlap = irlap_open(netdev, &self->qos, hwname);
	IRDA_ASSERT(self->irlap != NULL, return -1;);

	/* Allow IrLAP to send data to us */
	netif_start_queue(netdev);

	/* We submit all the Rx URB except for one that we keep idle.
	 * Need to be initialised before submitting other USBs, because
	 * in some cases as soon as we submit the URBs the USB layer
	 * will trigger a dummy receive - Jean II */
	self->idle_rx_urb = self->rx_urb[IU_MAX_ACTIVE_RX_URBS];
	self->idle_rx_urb->context = NULL;

	/* Now that we can pass data to IrLAP, allow the USB layer
	 * to send us some data... */
	for (i = 0; i < IU_MAX_ACTIVE_RX_URBS; i++) {
		struct sk_buff *skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
		if (!skb) {
			/* If this ever happen, we are in deep s***.
			 * Basically, we can't start the Rx path... */
			IRDA_WARNING("%s(), Failed to allocate Rx skb\n",
				     __func__);
			return -1;
		}
		//skb_reserve(newskb, USB_IRDA_HEADER - 1);
		irda_usb_submit(self, skb, self->rx_urb[i]);
	}

	/* Ready to play !!! */
	return 0;
}

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_net_close (self)
 *
 *    Network device is taken down. Usually this is done by 
 *    "ifconfig irda0 down" 
 */
static int irda_usb_net_close(struct net_device *netdev)
{
	struct irda_usb_cb *self;
	int	i;

	IRDA_DEBUG(1, "%s()\n", __func__);

	IRDA_ASSERT(netdev != NULL, return -1;);
	self = netdev_priv(netdev);
	IRDA_ASSERT(self != NULL, return -1;);

	/* Clear this flag *before* unlinking the urbs and *before*
	 * stopping the network Tx queue - Jean II */
	self->netopen = 0;

	/* Stop network Tx queue */
	netif_stop_queue(netdev);

	/* Kill defered Rx URB */
	del_timer(&self->rx_defer_timer);

	/* Deallocate all the Rx path buffers (URBs and skb) */
	for (i = 0; i < self->max_rx_urb; i++) {
		struct urb *urb = self->rx_urb[i];
		struct sk_buff *skb = (struct sk_buff *) urb->context;
		/* Cancel the receive command */
		usb_kill_urb(urb);
		/* The skb is ours, free it */
		if(skb) {
			dev_kfree_skb(skb);
			urb->context = NULL;
		}
	}
	/* Cancel Tx and speed URB - need to be synchronous to avoid races */
	usb_kill_urb(self->tx_urb);
	usb_kill_urb(self->speed_urb);

	/* Stop and remove instance of IrLAP */
	if (self->irlap)
		irlap_close(self->irlap);
	self->irlap = NULL;

	return 0;
}

/*------------------------------------------------------------------*/
/*
 * IOCTLs : Extra out-of-band network commands...
 */
static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	unsigned long flags;
	struct if_irda_req *irq = (struct if_irda_req *) rq;
	struct irda_usb_cb *self;
	int ret = 0;

	IRDA_ASSERT(dev != NULL, return -1;);
	self = netdev_priv(dev);
	IRDA_ASSERT(self != NULL, return -1;);

	IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __func__, dev->name, cmd);

	switch (cmd) {
	case SIOCSBANDWIDTH: /* Set bandwidth */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		/* Protect us from USB callbacks, net watchdog and else. */
		spin_lock_irqsave(&self->lock, flags);
		/* Check if the device is still there */
		if(self->present) {
			/* Set the desired speed */
			self->new_speed = irq->ifr_baudrate;
			irda_usb_change_speed_xbofs(self);
		}
		spin_unlock_irqrestore(&self->lock, flags);
		break;
	case SIOCSMEDIABUSY: /* Set media busy */
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		/* Check if the IrDA stack is still there */
		if(self->netopen)
			irda_device_set_media_busy(self->netdev, TRUE);
		break;
	case SIOCGRECEIVING: /* Check if we are receiving right now */
		irq->ifr_receiving = irda_usb_is_receiving(self);
		break;
	default:
		ret = -EOPNOTSUPP;
	}
	
	return ret;
}

/*------------------------------------------------------------------*/
/*
 * Get device stats (for /proc/net/dev and ifconfig)
 */
static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev)
{
	struct irda_usb_cb *self = netdev_priv(dev);
	return &self->stats;
}

/********************* IRDA CONFIG SUBROUTINES *********************/
/*
 * Various subroutines dealing with IrDA and network stuff we use to
 * configure and initialise each irda-usb instance.
 * These functions are used below in the main calls of the driver...
 */

/*------------------------------------------------------------------*/
/*
 * Set proper values in the IrDA QOS structure
 */
static inline void irda_usb_init_qos(struct irda_usb_cb *self)
{
	struct irda_class_desc *desc;

	IRDA_DEBUG(3, "%s()\n", __func__);
	
	desc = self->irda_desc;
	
	/* Initialize QoS for this device */
	irda_init_max_qos_capabilies(&self->qos);

	/* See spec section 7.2 for meaning.
	 * Values are little endian (as most USB stuff), the IrDA stack
	 * use it in native order (see parameters.c). - Jean II */
	self->qos.baud_rate.bits       = le16_to_cpu(desc->wBaudRate);
	self->qos.min_turn_time.bits   = desc->bmMinTurnaroundTime;
	self->qos.additional_bofs.bits = desc->bmAdditionalBOFs;
	self->qos.window_size.bits     = desc->bmWindowSize;
	self->qos.data_size.bits       = desc->bmDataSize;

	IRDA_DEBUG(0, "%s(), dongle says speed=0x%X, size=0x%X, window=0x%X, bofs=0x%X, turn=0x%X\n", 
		__func__, self->qos.baud_rate.bits, self->qos.data_size.bits, self->qos.window_size.bits, self->qos.additional_bofs.bits, self->qos.min_turn_time.bits);

	/* Don't always trust what the dongle tell us */
	if(self->capability & IUC_SIR_ONLY)
		self->qos.baud_rate.bits	&= 0x00ff;
	if(self->capability & IUC_SMALL_PKT)
		self->qos.data_size.bits	 = 0x07;
	if(self->capability & IUC_NO_WINDOW)
		self->qos.window_size.bits	 = 0x01;
	if(self->capability & IUC_MAX_WINDOW)
		self->qos.window_size.bits	 = 0x7f;
	if(self->capability & IUC_MAX_XBOFS)
		self->qos.additional_bofs.bits	 = 0x01;

#if 1
	/* Module parameter can override the rx window size */
	if (qos_mtt_bits)
		self->qos.min_turn_time.bits = qos_mtt_bits;
#endif	    
	/* 
	 * Note : most of those values apply only for the receive path,
	 * the transmit path will be set differently - Jean II 
	 */
	irda_qos_bits_to_value(&self->qos);
}

/*------------------------------------------------------------------*/
/*
 * Initialise the network side of the irda-usb instance
 * Called when a new USB instance is registered in irda_usb_probe()
 */
static inline int irda_usb_open(struct irda_usb_cb *self)
{
	struct net_device *netdev = self->netdev;

	IRDA_DEBUG(1, "%s()\n", __func__);

	irda_usb_init_qos(self);

	/* Override the network functions we need to use */
	netdev->hard_start_xmit = irda_usb_hard_xmit;
	netdev->tx_timeout	= irda_usb_net_timeout;
	netdev->watchdog_timeo  = 250*HZ/1000;	/* 250 ms > USB timeout */
	netdev->open            = irda_usb_net_open;
	netdev->stop            = irda_usb_net_close;
	netdev->get_stats	= irda_usb_net_get_stats;
	netdev->do_ioctl        = irda_usb_net_ioctl;

	return register_netdev(netdev);
}

/*------------------------------------------------------------------*/
/*
 * Cleanup the network side of the irda-usb instance
 * Called when a USB instance is removed in irda_usb_disconnect()
 */
static inline void irda_usb_close(struct irda_usb_cb *self)
{
	IRDA_DEBUG(1, "%s()\n", __func__);

	/* Remove netdevice */
	unregister_netdev(self->netdev);

	/* Remove the speed buffer */
	kfree(self->speed_buff);
	self->speed_buff = NULL;

	kfree(self->tx_buff);
	self->tx_buff = NULL;
}

/********************** USB CONFIG SUBROUTINES **********************/
/*
 * Various subroutines dealing with USB stuff we use to configure and
 * initialise each irda-usb instance.
 * These functions are used below in the main calls of the driver...
 */

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_parse_endpoints(dev, ifnum)
 *
 *    Parse the various endpoints and find the one we need.
 *
 * The endpoint are the pipes used to communicate with the USB device.
 * The spec defines 2 endpoints of type bulk transfer, one in, and one out.
 * These are used to pass frames back and forth with the dongle.
 * Most dongle have also an interrupt endpoint, that will be probably
 * documented in the next spec...
 */
static inline int irda_usb_parse_endpoints(struct irda_usb_cb *self, struct usb_host_endpoint *endpoint, int ennum)
{
	int i;		/* Endpoint index in table */
		
	/* Init : no endpoints */
	self->bulk_in_ep = 0;
	self->bulk_out_ep = 0;
	self->bulk_int_ep = 0;

	/* Let's look at all those endpoints */
	for(i = 0; i < ennum; i++) {
		/* All those variables will get optimised by the compiler,
		 * so let's aim for clarity... - Jean II */
		__u8 ep;	/* Endpoint address */
		__u8 dir;	/* Endpoint direction */
		__u8 attr;	/* Endpoint attribute */
		__u16 psize;	/* Endpoint max packet size in bytes */

		/* Get endpoint address, direction and attribute */
		ep = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
		dir = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK;
		attr = endpoint[i].desc.bmAttributes;
		psize = le16_to_cpu(endpoint[i].desc.wMaxPacketSize);

		/* Is it a bulk endpoint ??? */
		if(attr == USB_ENDPOINT_XFER_BULK) {
			/* We need to find an IN and an OUT */
			if(dir == USB_DIR_IN) {
				/* This is our Rx endpoint */
				self->bulk_in_ep = ep;
			} else {
				/* This is our Tx endpoint */
				self->bulk_out_ep = ep;
				self->bulk_out_mtu = psize;
			}
		} else {
			if((attr == USB_ENDPOINT_XFER_INT) &&
			   (dir == USB_DIR_IN)) {
				/* This is our interrupt endpoint */
				self->bulk_int_ep = ep;
			} else {
				IRDA_ERROR("%s(), Unrecognised endpoint %02X.\n", __func__, ep);
			}
		}
	}

	IRDA_DEBUG(0, "%s(), And our endpoints are : in=%02X, out=%02X (%d), int=%02X\n",
		__func__, self->bulk_in_ep, self->bulk_out_ep, self->bulk_out_mtu, self->bulk_int_ep);

	return((self->bulk_in_ep != 0) && (self->bulk_out_ep != 0));
}

#ifdef IU_DUMP_CLASS_DESC
/*------------------------------------------------------------------*/
/*
 * Function usb_irda_dump_class_desc(desc)
 *
 *    Prints out the contents of the IrDA class descriptor
 *
 */
static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
{
	/* Values are little endian */
	printk("bLength=%x\n", desc->bLength);
	printk("bDescriptorType=%x\n", desc->bDescriptorType);
	printk("bcdSpecRevision=%x\n", le16_to_cpu(desc->bcdSpecRevision)); 
	printk("bmDataSize=%x\n", desc->bmDataSize);
	printk("bmWindowSize=%x\n", desc->bmWindowSize);
	printk("bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
	printk("wBaudRate=%x\n", le16_to_cpu(desc->wBaudRate));
	printk("bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
	printk("bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
	printk("bMaxUnicastList=%x\n", desc->bMaxUnicastList);
}
#endif /* IU_DUMP_CLASS_DESC */

/*------------------------------------------------------------------*/
/*
 * Function irda_usb_find_class_desc(intf)
 *
 *    Returns instance of IrDA class descriptor, or NULL if not found
 *
 * The class descriptor is some extra info that IrDA USB devices will
 * offer to us, describing their IrDA characteristics. We will use that in
 * irda_usb_init_qos()
 */
static inline struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf)
{
	struct usb_device *dev = interface_to_usbdev (intf);
	struct irda_class_desc *desc;
	int ret;

	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
	if (!desc)
		return NULL;

	/* USB-IrDA class spec 1.0:
	 *	6.1.3: Standard "Get Descriptor" Device Request is not
	 *	       appropriate to retrieve class-specific descriptor
	 *	6.2.5: Class Specific "Get Class Descriptor" Interface Request
	 *	       is mandatory and returns the USB-IrDA class descriptor
	 */

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
		IU_REQ_GET_CLASS_DESC,
		USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		0, intf->altsetting->desc.bInterfaceNumber, desc,
		sizeof(*desc), 500);
	
	IRDA_DEBUG(1, "%s(), ret=%d\n", __func__, ret);
	if (ret < sizeof(*desc)) {
		IRDA_WARNING("usb-irda: class_descriptor read %s (%d)\n",
			     (ret<0) ? "failed" : "too short", ret);
	}
	else if (desc->bDescriptorType != USB_DT_IRDA) {
		IRDA_WARNING("usb-irda: bad class_descriptor type\n");
	}
	else {
#ifdef IU_DUMP_CLASS_DESC
		irda_usb_dump_class_desc(desc);
#endif	/* IU_DUMP_CLASS_DESC */

		return desc;
	}
	kfree(desc);
	return NULL;
}

/*********************** USB DEVICE CALLBACKS ***********************/
/*
 * Main calls from the USB subsystem.
 * Mostly registering a new irda-usb device and removing it....
 */

/*------------------------------------------------------------------*/
/*
 * This routine is called by the USB subsystem for each new device
 * in the system. We need to check if the device is ours, and in
 * this case start handling it.
 * The USB layer protect us from reentrancy (via BKL), so we don't need
 * to spinlock in there... Jean II
 */
static int irda_usb_probe(struct usb_interface *intf,
			  const struct usb_device_id *id)
{
	struct net_device *net;
	struct usb_device *dev = interface_to_usbdev(intf);
	struct irda_usb_cb *self;
	struct usb_host_interface *interface;
	struct irda_class_desc *irda_desc;
	int ret = -ENOMEM;
	int i;		/* Driver instance index / Rx URB index */

	/* Note : the probe make sure to call us only for devices that
	 * matches the list of dongle (top of the file). So, we
	 * don't need to check if the dongle is really ours.
	 * Jean II */

	IRDA_MESSAGE("IRDA-USB found at address %d, Vendor: %x, Product: %x\n",
		     dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
		     le16_to_cpu(dev->descriptor.idProduct));

	net = alloc_irdadev(sizeof(*self));
	if (!net) 
		goto err_out;

	SET_NETDEV_DEV(net, &intf->dev);
	self = netdev_priv(net);
	self->netdev = net;
	spin_lock_init(&self->lock);
	init_timer(&self->rx_defer_timer);

	self->capability = id->driver_info;
	self->needspatch = ((self->capability & IUC_STIR421X) != 0);

	/* Create all of the needed urbs */
	if (self->capability & IUC_STIR421X) {
		self->max_rx_urb = IU_SIGMATEL_MAX_RX_URBS;
		self->header_length = USB_IRDA_STIR421X_HEADER;
	} else {
		self->max_rx_urb = IU_MAX_RX_URBS;
		self->header_length = USB_IRDA_HEADER;
	}

	self->rx_urb = kcalloc(self->max_rx_urb, sizeof(struct urb *),
				GFP_KERNEL);

	for (i = 0; i < self->max_rx_urb; i++) {
		self->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
		if (!self->rx_urb[i]) {
			goto err_out_1;
		}
	}
	self->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!self->tx_urb) {
		goto err_out_1;
	}
	self->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!self->speed_urb) {
		goto err_out_2;
	}

	/* Is this really necessary? (no, except maybe for broken devices) */
	if (usb_reset_configuration (dev) < 0) {
		err("reset_configuration failed");
		ret = -EIO;
		goto err_out_3;
	}

	/* Is this really necessary? */
	/* Note : some driver do hardcode the interface number, some others
	 * specify an alternate, but very few driver do like this.
	 * Jean II */
	ret = usb_set_interface(dev, intf->altsetting->desc.bInterfaceNumber, 0);
	IRDA_DEBUG(1, "usb-irda: set interface %d result %d\n", intf->altsetting->desc.bInterfaceNumber, ret);
	switch (ret) {
		case 0:
			break;
		case -EPIPE:		/* -EPIPE = -32 */
			/* Martin Diehl says if we get a -EPIPE we should
			 * be fine and we don't need to do a usb_clear_halt().
			 * - Jean II */
			IRDA_DEBUG(0, "%s(), Received -EPIPE, ignoring...\n", __func__);
			break;
		default:
			IRDA_DEBUG(0, "%s(), Unknown error %d\n", __func__, ret);
			ret = -EIO;
			goto err_out_3;
	}

	/* Find our endpoints */
	interface = intf->cur_altsetting;
	if(!irda_usb_parse_endpoints(self, interface->endpoint,
				     interface->desc.bNumEndpoints)) {
		IRDA_ERROR("%s(), Bogus endpoints...\n", __func__);
		ret = -EIO;
		goto err_out_3;
	}

	self->usbdev = dev;

	/* Find IrDA class descriptor */
	irda_desc = irda_usb_find_class_desc(intf);
	ret = -ENODEV;
	if (!irda_desc)
		goto err_out_3;

	if (self->needspatch) {
		ret = usb_control_msg (self->usbdev, usb_sndctrlpipe (self->usbdev, 0),
				       0x02, 0x40, 0, 0, NULL, 0, 500);
		if (ret < 0) {
			IRDA_DEBUG (0, "usb_control_msg failed %d\n", ret);
			goto err_out_3;
		} else {
			mdelay(10);
		}
	}

	self->irda_desc =  irda_desc;
	self->present = 1;
	self->netopen = 0;
	self->usbintf = intf;

	/* Allocate the buffer for speed changes */
	/* Don't change this buffer size and allocation without doing
	 * some heavy and complete testing. Don't ask why :-(
	 * Jean II */
	self->speed_buff = kzalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
	if (!self->speed_buff)
		goto err_out_3;

	self->tx_buff = kzalloc(IRDA_SKB_MAX_MTU + self->header_length,
				GFP_KERNEL);
	if (!self->tx_buff)
		goto err_out_4;

	ret = irda_usb_open(self);
	if (ret) 
		goto err_out_5;

	IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
	usb_set_intfdata(intf, self);

	if (self->needspatch) {
		/* Now we fetch and upload the firmware patch */
		ret = stir421x_patch_device(self);
		self->needspatch = (ret < 0);
		if (self->needspatch) {
			IRDA_ERROR("STIR421X: Couldn't upload patch\n");
			goto err_out_6;
		}

		/* replace IrDA class descriptor with what patched device is now reporting */
		irda_desc = irda_usb_find_class_desc (self->usbintf);
		if (!irda_desc) {
			ret = -ENODEV;
			goto err_out_6;
		}
		kfree(self->irda_desc);
		self->irda_desc = irda_desc;
		irda_usb_init_qos(self);
	}

	return 0;
err_out_6:
	unregister_netdev(self->netdev);
err_out_5:
	kfree(self->tx_buff);
err_out_4:
	kfree(self->speed_buff);
err_out_3:
	/* Free all urbs that we may have created */
	usb_free_urb(self->speed_urb);
err_out_2:
	usb_free_urb(self->tx_urb);
err_out_1:
	for (i = 0; i < self->max_rx_urb; i++)
		usb_free_urb(self->rx_urb[i]);
	free_netdev(net);
err_out:
	return ret;
}

/*------------------------------------------------------------------*/
/*
 * The current irda-usb device is removed, the USB layer tell us
 * to shut it down...
 * One of the constraints is that when we exit this function,
 * we cannot use the usb_device no more. Gone. Destroyed. kfree().
 * Most other subsystem allow you to destroy the instance at a time
 * when it's convenient to you, to postpone it to a later date, but
 * not the USB subsystem.
 * So, we must make bloody sure that everything gets deactivated.
 * Jean II
 */
static void irda_usb_disconnect(struct usb_interface *intf)
{
	unsigned long flags;
	struct irda_usb_cb *self = usb_get_intfdata(intf);
	int i;

	IRDA_DEBUG(1, "%s()\n", __func__);

	usb_set_intfdata(intf, NULL);
	if (!self)
		return;

	/* Make sure that the Tx path is not executing. - Jean II */
	spin_lock_irqsave(&self->lock, flags);

	/* Oups ! We are not there any more.
	 * This will stop/desactivate the Tx path. - Jean II */
	self->present = 0;

	/* Kill defered Rx URB */
	del_timer(&self->rx_defer_timer);

	/* We need to have irq enabled to unlink the URBs. That's OK,
	 * at this point the Tx path is gone - Jean II */
	spin_unlock_irqrestore(&self->lock, flags);

	/* Hum... Check if networking is still active (avoid races) */
	if((self->netopen) || (self->irlap)) {
		/* Accept no more transmissions */
		/*netif_device_detach(self->netdev);*/
		netif_stop_queue(self->netdev);
		/* Stop all the receive URBs. Must be synchronous. */
		for (i = 0; i < self->max_rx_urb; i++)
			usb_kill_urb(self->rx_urb[i]);
		/* Cancel Tx and speed URB.
		 * Make sure it's synchronous to avoid races. */
		usb_kill_urb(self->tx_urb);
		usb_kill_urb(self->speed_urb);
	}

	/* Cleanup the device stuff */
	irda_usb_close(self);
	/* No longer attached to USB bus */
	self->usbdev = NULL;
	self->usbintf = NULL;

	/* Clean up our urbs */
	for (i = 0; i < self->max_rx_urb; i++)
		usb_free_urb(self->rx_urb[i]);
	kfree(self->rx_urb);
	/* Clean up Tx and speed URB */
	usb_free_urb(self->tx_urb);
	usb_free_urb(self->speed_urb);

	/* Free self and network device */
	free_netdev(self->netdev);
	IRDA_DEBUG(0, "%s(), USB IrDA Disconnected\n", __func__);
}

/*------------------------------------------------------------------*/
/*
 * USB device callbacks
 */
static struct usb_driver irda_driver = {
	.name		= "irda-usb",
	.probe		= irda_usb_probe,
	.disconnect	= irda_usb_disconnect,
	.id_table	= dongles,
};

/************************* MODULE CALLBACKS *************************/
/*
 * Deal with module insertion/removal
 * Mostly tell USB about our existence
 */

/*------------------------------------------------------------------*/
/*
 * Module insertion
 */
static int __init usb_irda_init(void)
{
	int	ret;

	ret = usb_register(&irda_driver);
	if (ret < 0)
		return ret;

	IRDA_MESSAGE("USB IrDA support registered\n");
	return 0;
}
module_init(usb_irda_init);

/*------------------------------------------------------------------*/
/*
 * Module removal
 */
static void __exit usb_irda_cleanup(void)
{
	/* Deregister the driver and remove all pending instances */
	usb_deregister(&irda_driver);
}
module_exit(usb_irda_cleanup);

/*------------------------------------------------------------------*/
/*
 * Module parameters
 */
module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
MODULE_AUTHOR("Roman Weissgaerber <weissg@vienna.at>, Dag Brattli <dag@brattli.net>, Jean Tourrilhes <jt@hpl.hp.com> and Nick Fedchik <nick@fedchik.org.ua>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
MODULE_LICENSE("GPL");