summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/hisax/hfc_usb.c
blob: ad5831f37d84a378c79e1253fa4cf0892a3b191b (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
/*
 * hfc_usb.c
 *
 * $Id: hfc_usb.c,v 2.3.2.24 2007/10/14 08:40:29 mbachem Exp $
 *
 * modular HiSax ISDN driver for Colognechip HFC-S USB chip
 *
 * Authors : Peter Sprenger (sprenger@moving-bytes.de)
 *           Martin Bachem (m.bachem@gmx.de, info@colognechip.com)
 *
 *           based on the first hfc_usb driver of
 *           Werner Cornelius (werner@isdn-development.de)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * See Version Histroy at the bottom of this file
 *
*/

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel_stat.h>
#include <linux/usb.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/moduleparam.h>
#include "hisax.h"
#include "hisax_if.h"
#include "hfc_usb.h"

static const char *hfcusb_revision =
    "$Revision: 2.3.2.24 $ $Date: 2007/10/14 08:40:29 $ ";

/* Hisax debug support
*  debug flags defined in hfc_usb.h as HFCUSB_DBG_[*]
*/
#define __debug_variable hfc_debug
#include "hisax_debug.h"
static u_int debug;
module_param(debug, uint, 0);
static int hfc_debug;


/* private vendor specific data */
typedef struct {
	__u8 led_scheme;	// led display scheme
	signed short led_bits[8];	// array of 8 possible LED bitmask settings
	char *vend_name;	// device name
} hfcsusb_vdata;

/* VID/PID device list */
static struct usb_device_id hfcusb_idtab[] = {
	{
	 USB_DEVICE(0x0959, 0x2bd0),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_OFF, {4, 0, 2, 1},
			   "ISDN USB TA (Cologne Chip HFC-S USB based)"}),
	},
	{
	 USB_DEVICE(0x0675, 0x1688),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {1, 2, 0, 0},
			   "DrayTek miniVigor 128 USB ISDN TA"}),
	},
	{
	 USB_DEVICE(0x07b0, 0x0007),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {0x80, -64, -32, -16},
			   "Billion tiny USB ISDN TA 128"}),
	},
	{
	 USB_DEVICE(0x0742, 0x2008),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {4, 0, 2, 1},
			   "Stollmann USB TA"}),
	},
	{
	 USB_DEVICE(0x0742, 0x2009),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {4, 0, 2, 1},
			   "Aceex USB ISDN TA"}),
	},
	{
	 USB_DEVICE(0x0742, 0x200A),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {4, 0, 2, 1},
			   "OEM USB ISDN TA"}),
	},
	{
	 USB_DEVICE(0x08e3, 0x0301),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {2, 0, 1, 4},
			   "Olitec USB RNIS"}),
	},
	{
	 USB_DEVICE(0x07fa, 0x0846),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {0x80, -64, -32, -16},
			   "Bewan Modem RNIS USB"}),
	},
	{
	 USB_DEVICE(0x07fa, 0x0847),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {0x80, -64, -32, -16},
			   "Djinn Numeris USB"}),
	},
	{
	 USB_DEVICE(0x07b0, 0x0006),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {0x80, -64, -32, -16},
			   "Twister ISDN TA"}),
	},
	{
	 USB_DEVICE(0x071d, 0x1005),
	 .driver_info = (unsigned long) &((hfcsusb_vdata)
			  {LED_SCHEME1, {0x02, 0, 0x01, 0x04},
			   "Eicon DIVA USB 4.0"}),
	},
	{ }
};

/* structure defining input+output fifos (interrupt/bulk mode) */
struct usb_fifo;		/* forward definition */
typedef struct iso_urb_struct {
	struct urb *purb;
	__u8 buffer[ISO_BUFFER_SIZE];	/* buffer incoming/outgoing data */
	struct usb_fifo *owner_fifo;	/* pointer to owner fifo */
} iso_urb_struct;

struct hfcusb_data;		/* forward definition */

typedef struct usb_fifo {
	int fifonum;		/* fifo index attached to this structure */
	int active;		/* fifo is currently active */
	struct hfcusb_data *hfc;	/* pointer to main structure */
	int pipe;		/* address of endpoint */
	__u8 usb_packet_maxlen;	/* maximum length for usb transfer */
	unsigned int max_size;	/* maximum size of receive/send packet */
	__u8 intervall;		/* interrupt interval */
	struct sk_buff *skbuff;	/* actual used buffer */
	struct urb *urb;	/* transfer structure for usb routines */
	__u8 buffer[128];	/* buffer incoming/outgoing data */
	int bit_line;		/* how much bits are in the fifo? */

	volatile __u8 usb_transfer_mode;	/* switched between ISO and INT */
	iso_urb_struct iso[2];	/* need two urbs to have one always for pending */
	struct hisax_if *hif;	/* hisax interface */
	int delete_flg;		/* only delete skbuff once */
	int last_urblen;	/* remember length of last packet */
} usb_fifo;

/* structure holding all data for one device */
typedef struct hfcusb_data {
	/* HiSax Interface for loadable Layer1 drivers */
	struct hisax_d_if d_if;		/* see hisax_if.h */
	struct hisax_b_if b_if[2];	/* see hisax_if.h */
	int protocol;

	struct usb_device *dev;	/* our device */
	int if_used;		/* used interface number */
	int alt_used;		/* used alternate config */
	int ctrl_paksize;	/* control pipe packet size */
	int ctrl_in_pipe,	/* handles for control pipe */
	    ctrl_out_pipe;
	int cfg_used;		/* configuration index used */
	int vend_idx;		/* vendor found */
	int b_mode[2];		/* B-channel mode */
	int l1_activated;	/* layer 1 activated */
	int disc_flag;		/* TRUE if device was disonnected to avoid some USB actions */
	int packet_size, iso_packet_size;

	/* control pipe background handling */
	ctrl_buft ctrl_buff[HFC_CTRL_BUFSIZE];	/* buffer holding queued data */
	volatile int ctrl_in_idx, ctrl_out_idx, ctrl_cnt;	/* input/output pointer + count */
	struct urb *ctrl_urb;	/* transfer structure for control channel */

	struct usb_ctrlrequest ctrl_write;	/* buffer for control write request */
	struct usb_ctrlrequest ctrl_read;	/* same for read request */

	__u8 old_led_state, led_state;

	volatile __u8 threshold_mask;	/* threshold actually reported */
	volatile __u8 bch_enables;	/* or mask for sctrl_r and sctrl register values */

	usb_fifo fifos[HFCUSB_NUM_FIFOS];	/* structure holding all fifo data */

	volatile __u8 l1_state;	/* actual l1 state */
	struct timer_list t3_timer;	/* timer 3 for activation/deactivation */
	struct timer_list t4_timer;	/* timer 4 for activation/deactivation */
} hfcusb_data;


static void collect_rx_frame(usb_fifo * fifo, __u8 * data, int len,
			     int finish);

static inline const char *
symbolic(struct hfcusb_symbolic_list list[], const int num)
{
	int i;
	for (i = 0; list[i].name != NULL; i++)
		if (list[i].num == num)
			return (list[i].name);
	return "<unknown ERROR>";
}

static void
ctrl_start_transfer(hfcusb_data * hfc)
{
	if (hfc->ctrl_cnt) {
		hfc->ctrl_urb->pipe = hfc->ctrl_out_pipe;
		hfc->ctrl_urb->setup_packet = (u_char *) & hfc->ctrl_write;
		hfc->ctrl_urb->transfer_buffer = NULL;
		hfc->ctrl_urb->transfer_buffer_length = 0;
		hfc->ctrl_write.wIndex =
		    cpu_to_le16(hfc->ctrl_buff[hfc->ctrl_out_idx].hfc_reg);
		hfc->ctrl_write.wValue =
		    cpu_to_le16(hfc->ctrl_buff[hfc->ctrl_out_idx].reg_val);

		usb_submit_urb(hfc->ctrl_urb, GFP_ATOMIC);	/* start transfer */
	}
}				/* ctrl_start_transfer */

static int
queue_control_request(hfcusb_data * hfc, __u8 reg, __u8 val, int action)
{
	ctrl_buft *buf;

	if (hfc->ctrl_cnt >= HFC_CTRL_BUFSIZE)
		return (1);	/* no space left */
	buf = &hfc->ctrl_buff[hfc->ctrl_in_idx];	/* pointer to new index */
	buf->hfc_reg = reg;
	buf->reg_val = val;
	buf->action = action;
	if (++hfc->ctrl_in_idx >= HFC_CTRL_BUFSIZE)
		hfc->ctrl_in_idx = 0;	/* pointer wrap */
	if (++hfc->ctrl_cnt == 1)
		ctrl_start_transfer(hfc);
	return (0);
}

static void
ctrl_complete(struct urb *urb)
{
	hfcusb_data *hfc = (hfcusb_data *) urb->context;
	ctrl_buft *buf;

	urb->dev = hfc->dev;
	if (hfc->ctrl_cnt) {
		buf = &hfc->ctrl_buff[hfc->ctrl_out_idx];
		hfc->ctrl_cnt--;	/* decrement actual count */
		if (++hfc->ctrl_out_idx >= HFC_CTRL_BUFSIZE)
			hfc->ctrl_out_idx = 0;	/* pointer wrap */

		ctrl_start_transfer(hfc);	/* start next transfer */
	}
}

/* write led data to auxport & invert if necessary */
static void
write_led(hfcusb_data * hfc, __u8 led_state)
{
	if (led_state != hfc->old_led_state) {
		hfc->old_led_state = led_state;
		queue_control_request(hfc, HFCUSB_P_DATA, led_state, 1);
	}
}

static void
set_led_bit(hfcusb_data * hfc, signed short led_bits, int on)
{
	if (on) {
		if (led_bits < 0)
			hfc->led_state &= ~abs(led_bits);
		else
			hfc->led_state |= led_bits;
	} else {
		if (led_bits < 0)
			hfc->led_state |= abs(led_bits);
		else
			hfc->led_state &= ~led_bits;
	}
}

/* handle LED requests */
static void
handle_led(hfcusb_data * hfc, int event)
{
	hfcsusb_vdata *driver_info =
	    (hfcsusb_vdata *) hfcusb_idtab[hfc->vend_idx].driver_info;

	/* if no scheme -> no LED action */
	if (driver_info->led_scheme == LED_OFF)
		return;

	switch (event) {
		case LED_POWER_ON:
			set_led_bit(hfc, driver_info->led_bits[0], 1);
			set_led_bit(hfc, driver_info->led_bits[1], 0);
			set_led_bit(hfc, driver_info->led_bits[2], 0);
			set_led_bit(hfc, driver_info->led_bits[3], 0);
			break;
		case LED_POWER_OFF:
			set_led_bit(hfc, driver_info->led_bits[0], 0);
			set_led_bit(hfc, driver_info->led_bits[1], 0);
			set_led_bit(hfc, driver_info->led_bits[2], 0);
			set_led_bit(hfc, driver_info->led_bits[3], 0);
			break;
		case LED_S0_ON:
			set_led_bit(hfc, driver_info->led_bits[1], 1);
			break;
		case LED_S0_OFF:
			set_led_bit(hfc, driver_info->led_bits[1], 0);
			break;
		case LED_B1_ON:
			set_led_bit(hfc, driver_info->led_bits[2], 1);
			break;
		case LED_B1_OFF:
			set_led_bit(hfc, driver_info->led_bits[2], 0);
			break;
		case LED_B2_ON:
			set_led_bit(hfc, driver_info->led_bits[3], 1);
			break;
		case LED_B2_OFF:
			set_led_bit(hfc, driver_info->led_bits[3], 0);
			break;
	}
	write_led(hfc, hfc->led_state);
}

/* ISDN l1 timer T3 expires */
static void
l1_timer_expire_t3(hfcusb_data * hfc)
{
	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
			   NULL);

	DBG(HFCUSB_DBG_STATES,
	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T3 expire)");

	hfc->l1_activated = 0;
	handle_led(hfc, LED_S0_OFF);
	/* deactivate : */
	queue_control_request(hfc, HFCUSB_STATES, 0x10, 1);
	queue_control_request(hfc, HFCUSB_STATES, 3, 1);
}

/* ISDN l1 timer T4 expires */
static void
l1_timer_expire_t4(hfcusb_data * hfc)
{
	hfc->d_if.ifc.l1l2(&hfc->d_if.ifc, PH_DEACTIVATE | INDICATION,
			   NULL);

	DBG(HFCUSB_DBG_STATES,
	    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (T4 expire)");

	hfc->l1_activated = 0;
	handle_led(hfc, LED_S0_OFF);
}

/* S0 state changed */
static void
s0_state_handler(hfcusb_data * hfc, __u8 state)
{
	__u8 old_state;

	old_state = hfc->l1_state;
	if (state == old_state || state < 1 || state > 8)
		return;

	DBG(HFCUSB_DBG_STATES, "HFC-S USB: S0 statechange(%d -> %d)",
	    old_state, state);

	if (state < 4 || state == 7 || state == 8) {
		if (timer_pending(&hfc->t3_timer))
			del_timer(&hfc->t3_timer);
		DBG(HFCUSB_DBG_STATES, "HFC-S USB: T3 deactivated");
	}
	if (state >= 7) {
		if (timer_pending(&hfc->t4_timer))
			del_timer(&hfc->t4_timer);
		DBG(HFCUSB_DBG_STATES, "HFC-S USB: T4 deactivated");
	}

	if (state == 7 && !hfc->l1_activated) {
		hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
				   PH_ACTIVATE | INDICATION, NULL);
		DBG(HFCUSB_DBG_STATES, "HFC-S USB: PH_ACTIVATE | INDICATION sent");
		hfc->l1_activated = 1;
		handle_led(hfc, LED_S0_ON);
	} else if (state <= 3 /* && activated */ ) {
		if (old_state == 7 || old_state == 8) {
			DBG(HFCUSB_DBG_STATES, "HFC-S USB: T4 activated");
			if (!timer_pending(&hfc->t4_timer)) {
				hfc->t4_timer.expires =
				    jiffies + (HFC_TIMER_T4 * HZ) / 1000;
				add_timer(&hfc->t4_timer);
			}
		} else {
			hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
					   PH_DEACTIVATE | INDICATION,
					   NULL);
			DBG(HFCUSB_DBG_STATES,
			    "HFC-S USB: PH_DEACTIVATE | INDICATION sent");
			hfc->l1_activated = 0;
			handle_led(hfc, LED_S0_OFF);
		}
	}
	hfc->l1_state = state;
}

static void
fill_isoc_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe,
	      void *buf, int num_packets, int packet_size, int interval,
	      usb_complete_t complete, void *context)
{
	int k;

	urb->dev = dev;
	urb->pipe = pipe;
	urb->complete = complete;
	urb->number_of_packets = num_packets;
	urb->transfer_buffer_length = packet_size * num_packets;
	urb->context = context;
	urb->transfer_buffer = buf;
	urb->transfer_flags = URB_ISO_ASAP;
	urb->actual_length = 0;
	urb->interval = interval;
	for (k = 0; k < num_packets; k++) {
		urb->iso_frame_desc[k].offset = packet_size * k;
		urb->iso_frame_desc[k].length = packet_size;
		urb->iso_frame_desc[k].actual_length = 0;
	}
}

/* allocs urbs and start isoc transfer with two pending urbs to avoid
 * gaps in the transfer chain
 */
static int
start_isoc_chain(usb_fifo * fifo, int num_packets_per_urb,
		 usb_complete_t complete, int packet_size)
{
	int i, k, errcode;

	DBG(HFCUSB_DBG_INIT, "HFC-S USB: starting ISO-URBs for fifo:%d\n",
	    fifo->fifonum);

	/* allocate Memory for Iso out Urbs */
	for (i = 0; i < 2; i++) {
		if (!(fifo->iso[i].purb)) {
			fifo->iso[i].purb =
			    usb_alloc_urb(num_packets_per_urb, GFP_KERNEL);
			if (!(fifo->iso[i].purb)) {
				printk(KERN_INFO
				       "alloc urb for fifo %i failed!!!",
				       fifo->fifonum);
			}
			fifo->iso[i].owner_fifo = (struct usb_fifo *) fifo;

			/* Init the first iso */
			if (ISO_BUFFER_SIZE >=
			    (fifo->usb_packet_maxlen *
			     num_packets_per_urb)) {
				fill_isoc_urb(fifo->iso[i].purb,
					      fifo->hfc->dev, fifo->pipe,
					      fifo->iso[i].buffer,
					      num_packets_per_urb,
					      fifo->usb_packet_maxlen,
					      fifo->intervall, complete,
					      &fifo->iso[i]);
				memset(fifo->iso[i].buffer, 0,
				       sizeof(fifo->iso[i].buffer));
				/* defining packet delimeters in fifo->buffer */
				for (k = 0; k < num_packets_per_urb; k++) {
					fifo->iso[i].purb->
					    iso_frame_desc[k].offset =
					    k * packet_size;
					fifo->iso[i].purb->
					    iso_frame_desc[k].length =
					    packet_size;
				}
			} else {
				printk(KERN_INFO
				       "HFC-S USB: ISO Buffer size to small!\n");
			}
		}
		fifo->bit_line = BITLINE_INF;

		errcode = usb_submit_urb(fifo->iso[i].purb, GFP_KERNEL);
		fifo->active = (errcode >= 0) ? 1 : 0;
		if (errcode < 0)
			printk(KERN_INFO "HFC-S USB: usb_submit_urb URB nr:%d, error(%i): '%s'\n",
			       i, errcode, symbolic(urb_errlist, errcode));
	}
	return (fifo->active);
}

/* stops running iso chain and frees their pending urbs */
static void
stop_isoc_chain(usb_fifo * fifo)
{
	int i;

	for (i = 0; i < 2; i++) {
		if (fifo->iso[i].purb) {
			DBG(HFCUSB_DBG_INIT,
			    "HFC-S USB: Stopping iso chain for fifo %i.%i",
			    fifo->fifonum, i);
			usb_kill_urb(fifo->iso[i].purb);
			usb_free_urb(fifo->iso[i].purb);
			fifo->iso[i].purb = NULL;
		}
	}

	usb_kill_urb(fifo->urb);
	usb_free_urb(fifo->urb);
	fifo->urb = NULL;
	fifo->active = 0;
}

/* defines how much ISO packets are handled in one URB */
static int iso_packets[8] =
    { ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B,
	ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D
};

static void
tx_iso_complete(struct urb *urb)
{
	iso_urb_struct *context_iso_urb = (iso_urb_struct *) urb->context;
	usb_fifo *fifo = context_iso_urb->owner_fifo;
	hfcusb_data *hfc = fifo->hfc;
	int k, tx_offset, num_isoc_packets, sink, len, current_len,
	    errcode;
	int frame_complete, transp_mode, fifon, status;
	__u8 threshbit;

	fifon = fifo->fifonum;
	status = urb->status;

	tx_offset = 0;

	/* ISO transfer only partially completed,
	   look at individual frame status for details */
	if (status == -EXDEV) {
		DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: tx_iso_complete with -EXDEV"
		    ", urb->status %d, fifonum %d\n",
		    status, fifon);

		for (k = 0; k < iso_packets[fifon]; ++k) {
			errcode = urb->iso_frame_desc[k].status;
			if (errcode)
				DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: tx_iso_complete "
				       "packet %i, status: %i\n",
				       k, errcode);
		}

		// clear status, so go on with ISO transfers
		status = 0;
	}

	if (fifo->active && !status) {
		transp_mode = 0;
		if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
			transp_mode = 1;

		/* is FifoFull-threshold set for our channel? */
		threshbit = (hfc->threshold_mask & (1 << fifon));
		num_isoc_packets = iso_packets[fifon];

		/* predict dataflow to avoid fifo overflow */
		if (fifon >= HFCUSB_D_TX) {
			sink = (threshbit) ? SINK_DMIN : SINK_DMAX;
		} else {
			sink = (threshbit) ? SINK_MIN : SINK_MAX;
		}
		fill_isoc_urb(urb, fifo->hfc->dev, fifo->pipe,
			      context_iso_urb->buffer, num_isoc_packets,
			      fifo->usb_packet_maxlen, fifo->intervall,
			      tx_iso_complete, urb->context);
		memset(context_iso_urb->buffer, 0,
		       sizeof(context_iso_urb->buffer));
		frame_complete = 0;

		/* Generate next ISO Packets */
		for (k = 0; k < num_isoc_packets; ++k) {
			if (fifo->skbuff) {
				len = fifo->skbuff->len;
				/* we lower data margin every msec */
				fifo->bit_line -= sink;
				current_len = (0 - fifo->bit_line) / 8;
				/* maximum 15 byte for every ISO packet makes our life easier */
				if (current_len > 14)
					current_len = 14;
				current_len =
				    (len <=
				     current_len) ? len : current_len;
				/* how much bit do we put on the line? */
				fifo->bit_line += current_len * 8;

				context_iso_urb->buffer[tx_offset] = 0;
				if (current_len == len) {
					if (!transp_mode) {
						/* here frame completion */
						context_iso_urb->
						    buffer[tx_offset] = 1;
						/* add 2 byte flags and 16bit CRC at end of ISDN frame */
						fifo->bit_line += 32;
					}
					frame_complete = 1;
				}

				memcpy(context_iso_urb->buffer +
				       tx_offset + 1, fifo->skbuff->data,
				       current_len);
				skb_pull(fifo->skbuff, current_len);

				/* define packet delimeters within the URB buffer */
				urb->iso_frame_desc[k].offset = tx_offset;
				urb->iso_frame_desc[k].length =
				    current_len + 1;

				tx_offset += (current_len + 1);
			} else {
				urb->iso_frame_desc[k].offset =
				    tx_offset++;

				urb->iso_frame_desc[k].length = 1;
				fifo->bit_line -= sink;	/* we lower data margin every msec */

				if (fifo->bit_line < BITLINE_INF) {
					fifo->bit_line = BITLINE_INF;
				}
			}

			if (frame_complete) {
				fifo->delete_flg = 1;
				fifo->hif->l1l2(fifo->hif,
						PH_DATA | CONFIRM,
						(void *) (unsigned long) fifo->skbuff->
						truesize);
				if (fifo->skbuff && fifo->delete_flg) {
					dev_kfree_skb_any(fifo->skbuff);
					fifo->skbuff = NULL;
					fifo->delete_flg = 0;
				}
				frame_complete = 0;
			}
		}
		errcode = usb_submit_urb(urb, GFP_ATOMIC);
		if (errcode < 0) {
			printk(KERN_INFO
			       "HFC-S USB: error submitting ISO URB: %d\n",
			       errcode);
		}
	} else {
		if (status && !hfc->disc_flag) {
			printk(KERN_INFO
			       "HFC-S USB: tx_iso_complete: error(%i): '%s', fifonum=%d\n",
			       status, symbolic(urb_errlist, status), fifon);
		}
	}
}

static void
rx_iso_complete(struct urb *urb)
{
	iso_urb_struct *context_iso_urb = (iso_urb_struct *) urb->context;
	usb_fifo *fifo = context_iso_urb->owner_fifo;
	hfcusb_data *hfc = fifo->hfc;
	int k, len, errcode, offset, num_isoc_packets, fifon, maxlen,
	    status;
	unsigned int iso_status;
	__u8 *buf;
	static __u8 eof[8];

	fifon = fifo->fifonum;
	status = urb->status;

	if (urb->status == -EOVERFLOW) {
		DBG(HFCUSB_DBG_VERBOSE_USB,
		    "HFC-USB: ignoring USB DATAOVERRUN fifo(%i)", fifon);
		status = 0;
	}

	/* ISO transfer only partially completed,
	   look at individual frame status for details */
	if (status == -EXDEV) {
		DBG(HFCUSB_DBG_VERBOSE_USB, "HFC-S USB: rx_iso_complete with -EXDEV "
		    "urb->status %d, fifonum %d\n",
		    status, fifon);
		status = 0;
	}

	if (fifo->active && !status) {
		num_isoc_packets = iso_packets[fifon];
		maxlen = fifo->usb_packet_maxlen;
		for (k = 0; k < num_isoc_packets; ++k) {
			len = urb->iso_frame_desc[k].actual_length;
			offset = urb->iso_frame_desc[k].offset;
			buf = context_iso_urb->buffer + offset;
			iso_status = urb->iso_frame_desc[k].status;

			if (iso_status && !hfc->disc_flag)
				DBG(HFCUSB_DBG_VERBOSE_USB,
				    "HFC-S USB: rx_iso_complete "
				    "ISO packet %i, status: %i\n",
				    k, iso_status);

			if (fifon == HFCUSB_D_RX) {
				DBG(HFCUSB_DBG_VERBOSE_USB,
				       "HFC-S USB: ISO-D-RX lst_urblen:%2d "
				       "act_urblen:%2d max-urblen:%2d EOF:0x%0x",
				       fifo->last_urblen, len, maxlen,
				       eof[5]);

				DBG_PACKET(HFCUSB_DBG_VERBOSE_USB, buf, len);
			}

			if (fifo->last_urblen != maxlen) {
				/* the threshold mask is in the 2nd status byte */
				hfc->threshold_mask = buf[1];
				/* care for L1 state only for D-Channel
				   to avoid overlapped iso completions */
				if (fifon == HFCUSB_D_RX) {
					/* the S0 state is in the upper half
					   of the 1st status byte */
					s0_state_handler(hfc, buf[0] >> 4);
				}
				eof[fifon] = buf[0] & 1;
				if (len > 2)
					collect_rx_frame(fifo, buf + 2,
							 len - 2,
							 (len < maxlen) ?
							 eof[fifon] : 0);
			} else {
				collect_rx_frame(fifo, buf, len,
						 (len <
						  maxlen) ? eof[fifon] :
						 0);
			}
			fifo->last_urblen = len;
		}

		fill_isoc_urb(urb, fifo->hfc->dev, fifo->pipe,
			      context_iso_urb->buffer, num_isoc_packets,
			      fifo->usb_packet_maxlen, fifo->intervall,
			      rx_iso_complete, urb->context);
		errcode = usb_submit_urb(urb, GFP_ATOMIC);
		if (errcode < 0) {
			printk(KERN_ERR
			       "HFC-S USB: error submitting ISO URB: %d\n",
			       errcode);
		}
	} else {
		if (status && !hfc->disc_flag) {
			printk(KERN_ERR
			       "HFC-S USB: rx_iso_complete : "
			       "urb->status %d, fifonum %d\n",
			       status, fifon);
		}
	}
}

/* collect rx data from INT- and ISO-URBs  */
static void
collect_rx_frame(usb_fifo * fifo, __u8 * data, int len, int finish)
{
	hfcusb_data *hfc = fifo->hfc;
	int transp_mode, fifon;

	fifon = fifo->fifonum;
	transp_mode = 0;
	if (fifon < 4 && hfc->b_mode[fifon / 2] == L1_MODE_TRANS)
		transp_mode = 1;

	if (!fifo->skbuff) {
		fifo->skbuff = dev_alloc_skb(fifo->max_size + 3);
		if (!fifo->skbuff) {
			printk(KERN_ERR
			       "HFC-S USB: cannot allocate buffer for fifo(%d)\n",
			       fifon);
			return;
		}
	}
	if (len) {
		if (fifo->skbuff->len + len < fifo->max_size) {
			memcpy(skb_put(fifo->skbuff, len), data, len);
		} else {
			DBG(HFCUSB_DBG_FIFO_ERR,
			       "HCF-USB: got frame exceeded fifo->max_size(%d) fifo(%d)",
			       fifo->max_size, fifon);
			DBG_SKB(HFCUSB_DBG_VERBOSE_USB, fifo->skbuff);
			skb_trim(fifo->skbuff, 0);
		}
	}
	if (transp_mode && fifo->skbuff->len >= 128) {
		fifo->hif->l1l2(fifo->hif, PH_DATA | INDICATION,
				fifo->skbuff);
		fifo->skbuff = NULL;
		return;
	}
	/* we have a complete hdlc packet */
	if (finish) {
		if ((!fifo->skbuff->data[fifo->skbuff->len - 1])
		    && (fifo->skbuff->len > 3)) {

			if (fifon == HFCUSB_D_RX) {
				DBG(HFCUSB_DBG_DCHANNEL,
				    "HFC-S USB: D-RX len(%d)", fifo->skbuff->len);
				DBG_SKB(HFCUSB_DBG_DCHANNEL, fifo->skbuff);
			}

			/* remove CRC & status */
			skb_trim(fifo->skbuff, fifo->skbuff->len - 3);
			if (fifon == HFCUSB_PCM_RX) {
				fifo->hif->l1l2(fifo->hif,
						PH_DATA_E | INDICATION,
						fifo->skbuff);
			} else
				fifo->hif->l1l2(fifo->hif,
						PH_DATA | INDICATION,
						fifo->skbuff);
			fifo->skbuff = NULL;	/* buffer was freed from upper layer */
		} else {
			DBG(HFCUSB_DBG_FIFO_ERR,
			    "HFC-S USB: ERROR frame len(%d) fifo(%d)",
			    fifo->skbuff->len, fifon);
			DBG_SKB(HFCUSB_DBG_VERBOSE_USB, fifo->skbuff);
			skb_trim(fifo->skbuff, 0);
		}
	}
}

static void
rx_int_complete(struct urb *urb)
{
	int len;
	int status;
	__u8 *buf, maxlen, fifon;
	usb_fifo *fifo = (usb_fifo *) urb->context;
	hfcusb_data *hfc = fifo->hfc;
	static __u8 eof[8];

	urb->dev = hfc->dev;	/* security init */

	fifon = fifo->fifonum;
	if ((!fifo->active) || (urb->status)) {
		DBG(HFCUSB_DBG_INIT, "HFC-S USB: RX-Fifo %i is going down (%i)",
		    fifon, urb->status);

		fifo->urb->interval = 0;	/* cancel automatic rescheduling */
		if (fifo->skbuff) {
			dev_kfree_skb_any(fifo->skbuff);
			fifo->skbuff = NULL;
		}
		return;
	}
	len = urb->actual_length;
	buf = fifo->buffer;
	maxlen = fifo->usb_packet_maxlen;

	if (fifon == HFCUSB_D_RX) {
		DBG(HFCUSB_DBG_VERBOSE_USB,
		       "HFC-S USB: INT-D-RX lst_urblen:%2d "
		       "act_urblen:%2d max-urblen:%2d EOF:0x%0x",
		       fifo->last_urblen, len, maxlen,
		       eof[5]);
		DBG_PACKET(HFCUSB_DBG_VERBOSE_USB, buf, len);
	}

	if (fifo->last_urblen != fifo->usb_packet_maxlen) {
		/* the threshold mask is in the 2nd status byte */
		hfc->threshold_mask = buf[1];
		/* the S0 state is in the upper half of the 1st status byte */
		s0_state_handler(hfc, buf[0] >> 4);
		eof[fifon] = buf[0] & 1;
		/* if we have more than the 2 status bytes -> collect data */
		if (len > 2)
			collect_rx_frame(fifo, buf + 2,
					 urb->actual_length - 2,
					 (len < maxlen) ? eof[fifon] : 0);
	} else {
		collect_rx_frame(fifo, buf, urb->actual_length,
				 (len < maxlen) ? eof[fifon] : 0);
	}
	fifo->last_urblen = urb->actual_length;
	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		printk(KERN_INFO
		       "HFC-S USB: %s error resubmitting URB fifo(%d)\n",
		       __func__, fifon);
	}
}

/* start initial INT-URB for certain fifo */
static void
start_int_fifo(usb_fifo * fifo)
{
	int errcode;

	DBG(HFCUSB_DBG_INIT, "HFC-S USB: starting RX INT-URB for fifo:%d\n",
	    fifo->fifonum);

	if (!fifo->urb) {
		fifo->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!fifo->urb)
			return;
	}
	usb_fill_int_urb(fifo->urb, fifo->hfc->dev, fifo->pipe,
			 fifo->buffer, fifo->usb_packet_maxlen,
			 rx_int_complete, fifo, fifo->intervall);
	fifo->active = 1;	/* must be marked active */
	errcode = usb_submit_urb(fifo->urb, GFP_KERNEL);
	if (errcode) {
		printk(KERN_ERR
		       "HFC-S USB: submit URB error(start_int_info): status:%i\n",
		       errcode);
		fifo->active = 0;
		fifo->skbuff = NULL;
	}
}

static void
setup_bchannel(hfcusb_data * hfc, int channel, int mode)
{
	__u8 val, idx_table[2] = { 0, 2 };

	if (hfc->disc_flag) {
		return;
	}
	DBG(HFCUSB_DBG_STATES, "HFC-S USB: setting channel %d to mode %d",
	    channel, mode);
	hfc->b_mode[channel] = mode;

	/* setup CON_HDLC */
	val = 0;
	if (mode != L1_MODE_NULL)
		val = 8;	/* enable fifo? */
	if (mode == L1_MODE_TRANS)
		val |= 2;	/* set transparent bit */

	/* set FIFO to transmit register */
	queue_control_request(hfc, HFCUSB_FIFO, idx_table[channel], 1);
	queue_control_request(hfc, HFCUSB_CON_HDLC, val, 1);
	/* reset fifo */
	queue_control_request(hfc, HFCUSB_INC_RES_F, 2, 1);
	/* set FIFO to receive register */
	queue_control_request(hfc, HFCUSB_FIFO, idx_table[channel] + 1, 1);
	queue_control_request(hfc, HFCUSB_CON_HDLC, val, 1);
	/* reset fifo */
	queue_control_request(hfc, HFCUSB_INC_RES_F, 2, 1);

	val = 0x40;
	if (hfc->b_mode[0])
		val |= 1;
	if (hfc->b_mode[1])
		val |= 2;
	queue_control_request(hfc, HFCUSB_SCTRL, val, 1);

	val = 0;
	if (hfc->b_mode[0])
		val |= 1;
	if (hfc->b_mode[1])
		val |= 2;
	queue_control_request(hfc, HFCUSB_SCTRL_R, val, 1);

	if (mode == L1_MODE_NULL) {
		if (channel)
			handle_led(hfc, LED_B2_OFF);
		else
			handle_led(hfc, LED_B1_OFF);
	} else {
		if (channel)
			handle_led(hfc, LED_B2_ON);
		else
			handle_led(hfc, LED_B1_ON);
	}
}

static void
hfc_usb_l2l1(struct hisax_if *my_hisax_if, int pr, void *arg)
{
	usb_fifo *fifo = my_hisax_if->priv;
	hfcusb_data *hfc = fifo->hfc;

	switch (pr) {
		case PH_ACTIVATE | REQUEST:
			if (fifo->fifonum == HFCUSB_D_TX) {
				DBG(HFCUSB_DBG_STATES,
				    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_ACTIVATE | REQUEST");

				if (hfc->l1_state != 3
				    && hfc->l1_state != 7) {
					hfc->d_if.ifc.l1l2(&hfc->d_if.ifc,
							   PH_DEACTIVATE |
							   INDICATION,
							   NULL);
					DBG(HFCUSB_DBG_STATES,
					    "HFC-S USB: PH_DEACTIVATE | INDICATION sent (not state 3 or 7)");
				} else {
					if (hfc->l1_state == 7) {	/* l1 already active */
						hfc->d_if.ifc.l1l2(&hfc->
								   d_if.
								   ifc,
								   PH_ACTIVATE
								   |
								   INDICATION,
								   NULL);
						DBG(HFCUSB_DBG_STATES,
						    "HFC-S USB: PH_ACTIVATE | INDICATION sent again ;)");
					} else {
						/* force sending sending INFO1 */
						queue_control_request(hfc,
								      HFCUSB_STATES,
								      0x14,
								      1);
						mdelay(1);
						/* start l1 activation */
						queue_control_request(hfc,
								      HFCUSB_STATES,
								      0x04,
								      1);
						if (!timer_pending
						    (&hfc->t3_timer)) {
							hfc->t3_timer.
							    expires =
							    jiffies +
							    (HFC_TIMER_T3 *
							     HZ) / 1000;
							add_timer(&hfc->
								  t3_timer);
						}
					}
				}
			} else {
				DBG(HFCUSB_DBG_STATES,
				    "HFC_USB: hfc_usb_d_l2l1 B-chan: PH_ACTIVATE | REQUEST");
				setup_bchannel(hfc,
					    (fifo->fifonum ==
					     HFCUSB_B1_TX) ? 0 : 1,
					    (long) arg);
				fifo->hif->l1l2(fifo->hif,
						PH_ACTIVATE | INDICATION,
						NULL);
			}
			break;
		case PH_DEACTIVATE | REQUEST:
			if (fifo->fifonum == HFCUSB_D_TX) {
				DBG(HFCUSB_DBG_STATES,
				    "HFC_USB: hfc_usb_d_l2l1 D-chan: PH_DEACTIVATE | REQUEST");
			} else {
				DBG(HFCUSB_DBG_STATES,
				    "HFC_USB: hfc_usb_d_l2l1 Bx-chan: PH_DEACTIVATE | REQUEST");
				setup_bchannel(hfc,
					    (fifo->fifonum ==
					     HFCUSB_B1_TX) ? 0 : 1,
					    (int) L1_MODE_NULL);
				fifo->hif->l1l2(fifo->hif,
						PH_DEACTIVATE | INDICATION,
						NULL);
			}
			break;
		case PH_DATA | REQUEST:
			if (fifo->skbuff && fifo->delete_flg) {
				dev_kfree_skb_any(fifo->skbuff);
				fifo->skbuff = NULL;
				fifo->delete_flg = 0;
			}
			fifo->skbuff = arg;	/* we have a new buffer */
			break;
		default:
			DBG(HFCUSB_DBG_STATES,
			       "HFC_USB: hfc_usb_d_l2l1: unknown state : %#x", pr);
			break;
	}
}

/* initial init HFC-S USB chip registers, HiSax interface, USB URBs */
static int
hfc_usb_init(hfcusb_data * hfc)
{
	usb_fifo *fifo;
	int i, err;
	u_char b;
	struct hisax_b_if *p_b_if[2];

	/* check the chip id */
	if (read_usb(hfc, HFCUSB_CHIP_ID, &b) != 1) {
		printk(KERN_INFO "HFC-USB: cannot read chip id\n");
		return (1);
	}
	if (b != HFCUSB_CHIPID) {
		printk(KERN_INFO "HFC-S USB: Invalid chip id 0x%02x\n", b);
		return (1);
	}

	/* first set the needed config, interface and alternate */
	err = usb_set_interface(hfc->dev, hfc->if_used, hfc->alt_used);

	/* do Chip reset */
	write_usb(hfc, HFCUSB_CIRM, 8);
	/* aux = output, reset off */
	write_usb(hfc, HFCUSB_CIRM, 0x10);

	/* set USB_SIZE to match wMaxPacketSize for INT or BULK transfers */
	write_usb(hfc, HFCUSB_USB_SIZE,
		  (hfc->packet_size / 8) | ((hfc->packet_size / 8) << 4));

	/* set USB_SIZE_I to match wMaxPacketSize for ISO transfers */
	write_usb(hfc, HFCUSB_USB_SIZE_I, hfc->iso_packet_size);

	/* enable PCM/GCI master mode */
	write_usb(hfc, HFCUSB_MST_MODE1, 0);	/* set default values */
	write_usb(hfc, HFCUSB_MST_MODE0, 1);	/* enable master mode */

	/* init the fifos */
	write_usb(hfc, HFCUSB_F_THRES,
		  (HFCUSB_TX_THRESHOLD /
		   8) | ((HFCUSB_RX_THRESHOLD / 8) << 4));

	fifo = hfc->fifos;
	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
		write_usb(hfc, HFCUSB_FIFO, i);	/* select the desired fifo */
		fifo[i].skbuff = NULL;	/* init buffer pointer */
		fifo[i].max_size =
		    (i <= HFCUSB_B2_RX) ? MAX_BCH_SIZE : MAX_DFRAME_LEN;
		fifo[i].last_urblen = 0;
		/* set 2 bit for D- & E-channel */
		write_usb(hfc, HFCUSB_HDLC_PAR,
			  ((i <= HFCUSB_B2_RX) ? 0 : 2));
		/* rx hdlc, enable IFF for D-channel */
		write_usb(hfc, HFCUSB_CON_HDLC,
			  ((i == HFCUSB_D_TX) ? 0x09 : 0x08));
		write_usb(hfc, HFCUSB_INC_RES_F, 2);	/* reset the fifo */
	}

	write_usb(hfc, HFCUSB_CLKDEL, 0x0f);	/* clock delay value */
	write_usb(hfc, HFCUSB_STATES, 3 | 0x10);	/* set deactivated mode */
	write_usb(hfc, HFCUSB_STATES, 3);	/* enable state machine */

	write_usb(hfc, HFCUSB_SCTRL_R, 0);	/* disable both B receivers */
	write_usb(hfc, HFCUSB_SCTRL, 0x40);	/* disable B transmitters + capacitive mode */

	/* set both B-channel to not connected */
	hfc->b_mode[0] = L1_MODE_NULL;
	hfc->b_mode[1] = L1_MODE_NULL;

	hfc->l1_activated = 0;
	hfc->disc_flag = 0;
	hfc->led_state = 0;
	hfc->old_led_state = 0;

	/* init the t3 timer */
	init_timer(&hfc->t3_timer);
	hfc->t3_timer.data = (long) hfc;
	hfc->t3_timer.function = (void *) l1_timer_expire_t3;

	/* init the t4 timer */
	init_timer(&hfc->t4_timer);
	hfc->t4_timer.data = (long) hfc;
	hfc->t4_timer.function = (void *) l1_timer_expire_t4;

	/* init the background machinery for control requests */
	hfc->ctrl_read.bRequestType = 0xc0;
	hfc->ctrl_read.bRequest = 1;
	hfc->ctrl_read.wLength = cpu_to_le16(1);
	hfc->ctrl_write.bRequestType = 0x40;
	hfc->ctrl_write.bRequest = 0;
	hfc->ctrl_write.wLength = 0;
	usb_fill_control_urb(hfc->ctrl_urb,
			     hfc->dev,
			     hfc->ctrl_out_pipe,
			     (u_char *) & hfc->ctrl_write,
			     NULL, 0, ctrl_complete, hfc);
	/* Init All Fifos */
	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
		hfc->fifos[i].iso[0].purb = NULL;
		hfc->fifos[i].iso[1].purb = NULL;
		hfc->fifos[i].active = 0;
	}
	/* register Modul to upper Hisax Layers */
	hfc->d_if.owner = THIS_MODULE;
	hfc->d_if.ifc.priv = &hfc->fifos[HFCUSB_D_TX];
	hfc->d_if.ifc.l2l1 = hfc_usb_l2l1;
	for (i = 0; i < 2; i++) {
		hfc->b_if[i].ifc.priv = &hfc->fifos[HFCUSB_B1_TX + i * 2];
		hfc->b_if[i].ifc.l2l1 = hfc_usb_l2l1;
		p_b_if[i] = &hfc->b_if[i];
	}
	/* default Prot: EURO ISDN, should be a module_param */
	hfc->protocol = 2;
	i = hisax_register(&hfc->d_if, p_b_if, "hfc_usb", hfc->protocol);
	if (i) {
		printk(KERN_INFO "HFC-S USB: hisax_register -> %d\n", i);
		return i;
	}

#ifdef CONFIG_HISAX_DEBUG
	hfc_debug = debug;
#endif

	for (i = 0; i < 4; i++)
		hfc->fifos[i].hif = &p_b_if[i / 2]->ifc;
	for (i = 4; i < 8; i++)
		hfc->fifos[i].hif = &hfc->d_if.ifc;

	/* 3 (+1) INT IN + 3 ISO OUT */
	if (hfc->cfg_used == CNF_3INT3ISO || hfc->cfg_used == CNF_4INT3ISO) {
		start_int_fifo(hfc->fifos + HFCUSB_D_RX);
		if (hfc->fifos[HFCUSB_PCM_RX].pipe)
			start_int_fifo(hfc->fifos + HFCUSB_PCM_RX);
		start_int_fifo(hfc->fifos + HFCUSB_B1_RX);
		start_int_fifo(hfc->fifos + HFCUSB_B2_RX);
	}
	/* 3 (+1) ISO IN + 3 ISO OUT */
	if (hfc->cfg_used == CNF_3ISO3ISO || hfc->cfg_used == CNF_4ISO3ISO) {
		start_isoc_chain(hfc->fifos + HFCUSB_D_RX, ISOC_PACKETS_D,
				 rx_iso_complete, 16);
		if (hfc->fifos[HFCUSB_PCM_RX].pipe)
			start_isoc_chain(hfc->fifos + HFCUSB_PCM_RX,
					 ISOC_PACKETS_D, rx_iso_complete,
					 16);
		start_isoc_chain(hfc->fifos + HFCUSB_B1_RX, ISOC_PACKETS_B,
				 rx_iso_complete, 16);
		start_isoc_chain(hfc->fifos + HFCUSB_B2_RX, ISOC_PACKETS_B,
				 rx_iso_complete, 16);
	}

	start_isoc_chain(hfc->fifos + HFCUSB_D_TX, ISOC_PACKETS_D,
			 tx_iso_complete, 1);
	start_isoc_chain(hfc->fifos + HFCUSB_B1_TX, ISOC_PACKETS_B,
			 tx_iso_complete, 1);
	start_isoc_chain(hfc->fifos + HFCUSB_B2_TX, ISOC_PACKETS_B,
			 tx_iso_complete, 1);

	handle_led(hfc, LED_POWER_ON);

	return (0);
}

/* initial callback for each plugged USB device */
static int
hfc_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	hfcusb_data *context;
	struct usb_host_interface *iface = intf->cur_altsetting;
	struct usb_host_interface *iface_used = NULL;
	struct usb_host_endpoint *ep;
	int ifnum = iface->desc.bInterfaceNumber;
	int i, idx, alt_idx, probe_alt_setting, vend_idx, cfg_used, *vcf,
	    attr, cfg_found, cidx, ep_addr;
	int cmptbl[16], small_match, iso_packet_size, packet_size,
	    alt_used = 0;
	hfcsusb_vdata *driver_info;

	vend_idx = 0xffff;
	for (i = 0; hfcusb_idtab[i].idVendor; i++) {
		if ((le16_to_cpu(dev->descriptor.idVendor) == hfcusb_idtab[i].idVendor)
		    && (le16_to_cpu(dev->descriptor.idProduct) == hfcusb_idtab[i].idProduct)) {
			vend_idx = i;
			continue;
		}
	}

	printk(KERN_INFO
	       "HFC-S USB: probing interface(%d) actalt(%d) minor(%d)\n",
	       ifnum, iface->desc.bAlternateSetting, intf->minor);

	if (vend_idx != 0xffff) {
		/* if vendor and product ID is OK, start probing alternate settings */
		alt_idx = 0;
		small_match = 0xffff;

		/* default settings */
		iso_packet_size = 16;
		packet_size = 64;

		while (alt_idx < intf->num_altsetting) {
			iface = intf->altsetting + alt_idx;
			probe_alt_setting = iface->desc.bAlternateSetting;
			cfg_used = 0;

			/* check for config EOL element */
			while (validconf[cfg_used][0]) {
				cfg_found = 1;
				vcf = validconf[cfg_used];
				/* first endpoint descriptor */
				ep = iface->endpoint;

				memcpy(cmptbl, vcf, 16 * sizeof(int));

				/* check for all endpoints in this alternate setting */
				for (i = 0; i < iface->desc.bNumEndpoints;
				     i++) {
					ep_addr =
					    ep->desc.bEndpointAddress;
					/* get endpoint base */
					idx = ((ep_addr & 0x7f) - 1) * 2;
					if (ep_addr & 0x80)
						idx++;
					attr = ep->desc.bmAttributes;
					if (cmptbl[idx] == EP_NUL) {
						cfg_found = 0;
					}
					if (attr == USB_ENDPOINT_XFER_INT
					    && cmptbl[idx] == EP_INT)
						cmptbl[idx] = EP_NUL;
					if (attr == USB_ENDPOINT_XFER_BULK
					    && cmptbl[idx] == EP_BLK)
						cmptbl[idx] = EP_NUL;
					if (attr == USB_ENDPOINT_XFER_ISOC
					    && cmptbl[idx] == EP_ISO)
						cmptbl[idx] = EP_NUL;

					/* check if all INT endpoints match minimum interval */
					if ((attr == USB_ENDPOINT_XFER_INT)
					    && (ep->desc.bInterval < vcf[17])) {
						cfg_found = 0;
					}
					ep++;
				}
				for (i = 0; i < 16; i++) {
					/* all entries must be EP_NOP or EP_NUL for a valid config */
					if (cmptbl[i] != EP_NOP
					    && cmptbl[i] != EP_NUL)
						cfg_found = 0;
				}
				if (cfg_found) {
					if (cfg_used < small_match) {
						small_match = cfg_used;
						alt_used =
						    probe_alt_setting;
						iface_used = iface;
					}
				}
				cfg_used++;
			}
			alt_idx++;
		} /* (alt_idx < intf->num_altsetting) */

		/* found a valid USB Ta Endpint config */
		if (small_match != 0xffff) {
			iface = iface_used;
			if (!(context = kzalloc(sizeof(hfcusb_data), GFP_KERNEL)))
				return (-ENOMEM);	/* got no mem */

			ep = iface->endpoint;
			vcf = validconf[small_match];

			for (i = 0; i < iface->desc.bNumEndpoints; i++) {
				ep_addr = ep->desc.bEndpointAddress;
				/* get endpoint base */
				idx = ((ep_addr & 0x7f) - 1) * 2;
				if (ep_addr & 0x80)
					idx++;
				cidx = idx & 7;
				attr = ep->desc.bmAttributes;

				/* init Endpoints */
				if (vcf[idx] != EP_NOP
				    && vcf[idx] != EP_NUL) {
					switch (attr) {
						case USB_ENDPOINT_XFER_INT:
							context->
							    fifos[cidx].
							    pipe =
							    usb_rcvintpipe
							    (dev,
							     ep->desc.
							     bEndpointAddress);
							context->
							    fifos[cidx].
							    usb_transfer_mode
							    = USB_INT;
							packet_size =
							    le16_to_cpu(ep->desc.wMaxPacketSize);
							break;
						case USB_ENDPOINT_XFER_BULK:
							if (ep_addr & 0x80)
								context->
								    fifos
								    [cidx].
								    pipe =
								    usb_rcvbulkpipe
								    (dev,
								     ep->
								     desc.
								     bEndpointAddress);
							else
								context->
								    fifos
								    [cidx].
								    pipe =
								    usb_sndbulkpipe
								    (dev,
								     ep->
								     desc.
								     bEndpointAddress);
							context->
							    fifos[cidx].
							    usb_transfer_mode
							    = USB_BULK;
							packet_size =
							    le16_to_cpu(ep->desc.wMaxPacketSize);
							break;
						case USB_ENDPOINT_XFER_ISOC:
							if (ep_addr & 0x80)
								context->
								    fifos
								    [cidx].
								    pipe =
								    usb_rcvisocpipe
								    (dev,
								     ep->
								     desc.
								     bEndpointAddress);
							else
								context->
								    fifos
								    [cidx].
								    pipe =
								    usb_sndisocpipe
								    (dev,
								     ep->
								     desc.
								     bEndpointAddress);
							context->
							    fifos[cidx].
							    usb_transfer_mode
							    = USB_ISOC;
							iso_packet_size =
							    le16_to_cpu(ep->desc.wMaxPacketSize);
							break;
						default:
							context->
							    fifos[cidx].
							    pipe = 0;
					}	/* switch attribute */

					if (context->fifos[cidx].pipe) {
						context->fifos[cidx].
						    fifonum = cidx;
						context->fifos[cidx].hfc =
						    context;
						context->fifos[cidx].usb_packet_maxlen =
						    le16_to_cpu(ep->desc.wMaxPacketSize);
						context->fifos[cidx].
						    intervall =
						    ep->desc.bInterval;
						context->fifos[cidx].
						    skbuff = NULL;
					}
				}
				ep++;
			}
			context->dev = dev;	/* save device */
			context->if_used = ifnum;	/* save used interface */
			context->alt_used = alt_used;	/* and alternate config */
			context->ctrl_paksize = dev->descriptor.bMaxPacketSize0;	/* control size */
			context->cfg_used = vcf[16];	/* store used config */
			context->vend_idx = vend_idx;	/* store found vendor */
			context->packet_size = packet_size;
			context->iso_packet_size = iso_packet_size;

			/* create the control pipes needed for register access */
			context->ctrl_in_pipe =
			    usb_rcvctrlpipe(context->dev, 0);
			context->ctrl_out_pipe =
			    usb_sndctrlpipe(context->dev, 0);
			context->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);

			driver_info =
			    (hfcsusb_vdata *) hfcusb_idtab[vend_idx].
			    driver_info;
			printk(KERN_INFO "HFC-S USB: detected \"%s\"\n",
			       driver_info->vend_name);

			DBG(HFCUSB_DBG_INIT,
			    "HFC-S USB: Endpoint-Config: %s (if=%d alt=%d), E-Channel(%d)",
			    conf_str[small_match], context->if_used,
			    context->alt_used,
			    validconf[small_match][18]);

			/* init the chip and register the driver */
			if (hfc_usb_init(context)) {
				usb_kill_urb(context->ctrl_urb);
				usb_free_urb(context->ctrl_urb);
				context->ctrl_urb = NULL;
				kfree(context);
				return (-EIO);
			}
			usb_set_intfdata(intf, context);
			return (0);
		}
	} else {
		printk(KERN_INFO
		       "HFC-S USB: no valid vendor found in USB descriptor\n");
	}
	return (-EIO);
}

/* callback for unplugged USB device */
static void
hfc_usb_disconnect(struct usb_interface *intf)
{
	hfcusb_data *context = usb_get_intfdata(intf);
	int i;

	handle_led(context, LED_POWER_OFF);
	schedule_timeout(HZ / 100);

	printk(KERN_INFO "HFC-S USB: device disconnect\n");
	context->disc_flag = 1;
	usb_set_intfdata(intf, NULL);

	if (timer_pending(&context->t3_timer))
		del_timer(&context->t3_timer);
	if (timer_pending(&context->t4_timer))
		del_timer(&context->t4_timer);

	/* tell all fifos to terminate */
	for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
		if (context->fifos[i].usb_transfer_mode == USB_ISOC) {
			if (context->fifos[i].active > 0) {
				stop_isoc_chain(&context->fifos[i]);
				DBG(HFCUSB_DBG_INIT,
				    "HFC-S USB: %s stopping ISOC chain Fifo(%i)",
				    __func__, i);
			}
		} else {
			if (context->fifos[i].active > 0) {
				context->fifos[i].active = 0;
				DBG(HFCUSB_DBG_INIT,
				    "HFC-S USB: %s unlinking URB for Fifo(%i)",
				    __func__, i);
			}
			usb_kill_urb(context->fifos[i].urb);
			usb_free_urb(context->fifos[i].urb);
			context->fifos[i].urb = NULL;
		}
		context->fifos[i].active = 0;
	}
	usb_kill_urb(context->ctrl_urb);
	usb_free_urb(context->ctrl_urb);
	context->ctrl_urb = NULL;
	hisax_unregister(&context->d_if);
	kfree(context);		/* free our structure again */
}

static struct usb_driver hfc_drv = {
	.name  = "hfc_usb",
	.id_table = hfcusb_idtab,
	.probe = hfc_usb_probe,
	.disconnect = hfc_usb_disconnect,
};

static void __exit
hfc_usb_mod_exit(void)
{
	usb_deregister(&hfc_drv); /* release our driver */
	printk(KERN_INFO "HFC-S USB: module removed\n");
}

static int __init
hfc_usb_mod_init(void)
{
	char revstr[30], datestr[30], dummy[30];
#ifndef CONFIG_HISAX_DEBUG
	hfc_debug = debug;
#endif
	sscanf(hfcusb_revision,
	       "%s %s $ %s %s %s $ ", dummy, revstr,
	       dummy, datestr, dummy);
	printk(KERN_INFO
	       "HFC-S USB: driver module revision %s date %s loaded, (debug=%i)\n",
	       revstr, datestr, debug);
	if (usb_register(&hfc_drv)) {
		printk(KERN_INFO
		       "HFC-S USB: Unable to register HFC-S USB module at usb stack\n");
		return (-1);	/* unable to register */
	}
	return (0);
}

module_init(hfc_usb_mod_init);
module_exit(hfc_usb_mod_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, hfcusb_idtab);