summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/gigaset/capi.c
blob: 6643d6533ccb98d9a8a49502d8ae3f69f68a9693 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
/*
 * Kernel CAPI interface for the Gigaset driver
 *
 * Copyright (c) 2009 by Tilman Schmidt <tilman@imap.cc>.
 *
 * =====================================================================
 *	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.
 * =====================================================================
 */

#include "gigaset.h"
#include <linux/ctype.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/isdn/capilli.h>
#include <linux/isdn/capicmd.h>
#include <linux/isdn/capiutil.h>

/* missing from kernelcapi.h */
#define CapiNcpiNotSupportedByProtocol	0x0001
#define CapiFlagsNotSupportedByProtocol	0x0002
#define CapiAlertAlreadySent		0x0003
#define CapiFacilitySpecificFunctionNotSupported	0x3011

/* missing from capicmd.h */
#define CAPI_CONNECT_IND_BASELEN	(CAPI_MSG_BASELEN+4+2+8*1)
#define CAPI_CONNECT_ACTIVE_IND_BASELEN	(CAPI_MSG_BASELEN+4+3*1)
#define CAPI_CONNECT_B3_IND_BASELEN	(CAPI_MSG_BASELEN+4+1)
#define CAPI_CONNECT_B3_ACTIVE_IND_BASELEN	(CAPI_MSG_BASELEN+4+1)
#define CAPI_DATA_B3_REQ_LEN64		(CAPI_MSG_BASELEN+4+4+2+2+2+8)
#define CAPI_DATA_B3_CONF_LEN		(CAPI_MSG_BASELEN+4+2+2)
#define CAPI_DISCONNECT_IND_LEN		(CAPI_MSG_BASELEN+4+2)
#define CAPI_DISCONNECT_B3_IND_BASELEN	(CAPI_MSG_BASELEN+4+2+1)
#define CAPI_FACILITY_CONF_BASELEN	(CAPI_MSG_BASELEN+4+2+2+1)
/* most _CONF messages contain only Controller/PLCI/NCCI and Info parameters */
#define CAPI_STDCONF_LEN		(CAPI_MSG_BASELEN+4+2)

#define CAPI_FACILITY_HANDSET	0x0000
#define CAPI_FACILITY_DTMF	0x0001
#define CAPI_FACILITY_V42BIS	0x0002
#define CAPI_FACILITY_SUPPSVC	0x0003
#define CAPI_FACILITY_WAKEUP	0x0004
#define CAPI_FACILITY_LI	0x0005

#define CAPI_SUPPSVC_GETSUPPORTED	0x0000

/* missing from capiutil.h */
#define CAPIMSG_PLCI_PART(m)	CAPIMSG_U8(m, 9)
#define CAPIMSG_NCCI_PART(m)	CAPIMSG_U16(m, 10)
#define CAPIMSG_HANDLE_REQ(m)	CAPIMSG_U16(m, 18) /* DATA_B3_REQ/_IND only! */
#define CAPIMSG_FLAGS(m)	CAPIMSG_U16(m, 20)
#define CAPIMSG_SETCONTROLLER(m, contr)	capimsg_setu8(m, 8, contr)
#define CAPIMSG_SETPLCI_PART(m, plci)	capimsg_setu8(m, 9, plci)
#define CAPIMSG_SETNCCI_PART(m, ncci)	capimsg_setu16(m, 10, ncci)
#define CAPIMSG_SETFLAGS(m, flags)	capimsg_setu16(m, 20, flags)

/* parameters with differing location in DATA_B3_CONF/_RESP: */
#define CAPIMSG_SETHANDLE_CONF(m, handle)	capimsg_setu16(m, 12, handle)
#define	CAPIMSG_SETINFO_CONF(m, info)		capimsg_setu16(m, 14, info)

/* Flags (DATA_B3_REQ/_IND) */
#define CAPI_FLAGS_DELIVERY_CONFIRMATION	0x04
#define CAPI_FLAGS_RESERVED			(~0x1f)

/* buffer sizes */
#define MAX_BC_OCTETS 11
#define MAX_HLC_OCTETS 3
#define MAX_NUMBER_DIGITS 20
#define MAX_FMT_IE_LEN 20

/* values for gigaset_capi_appl.connected */
#define APCONN_NONE	0	/* inactive/listening */
#define APCONN_SETUP	1	/* connecting */
#define APCONN_ACTIVE	2	/* B channel up */

/* registered application data structure */
struct gigaset_capi_appl {
	struct list_head ctrlist;
	struct gigaset_capi_appl *bcnext;
	u16 id;
	u16 nextMessageNumber;
	u32 listenInfoMask;
	u32 listenCIPmask;
	int connected;
};

/* CAPI specific controller data structure */
struct gigaset_capi_ctr {
	struct capi_ctr ctr;
	struct list_head appls;
	struct sk_buff_head sendqueue;
	atomic_t sendqlen;
	/* two _cmsg structures possibly used concurrently: */
	_cmsg hcmsg;	/* for message composition triggered from hardware */
	_cmsg acmsg;	/* for dissection of messages sent from application */
	u8 bc_buf[MAX_BC_OCTETS+1];
	u8 hlc_buf[MAX_HLC_OCTETS+1];
	u8 cgpty_buf[MAX_NUMBER_DIGITS+3];
	u8 cdpty_buf[MAX_NUMBER_DIGITS+2];
};

/* CIP Value table (from CAPI 2.0 standard, ch. 6.1) */
static struct {
	u8 *bc;
	u8 *hlc;
} cip2bchlc[] = {
	[1] = { "8090A3", NULL },
		/* Speech (A-law) */
	[2] = { "8890", NULL },
		/* Unrestricted digital information */
	[3] = { "8990", NULL },
		/* Restricted digital information */
	[4] = { "9090A3", NULL },
		/* 3,1 kHz audio (A-law) */
	[5] = { "9190", NULL },
		/* 7 kHz audio */
	[6] = { "9890", NULL },
		/* Video */
	[7] = { "88C0C6E6", NULL },
		/* Packet mode */
	[8] = { "8890218F", NULL },
		/* 56 kbit/s rate adaptation */
	[9] = { "9190A5", NULL },
		/* Unrestricted digital information with tones/announcements */
	[16] = { "8090A3", "9181" },
		/* Telephony */
	[17] = { "9090A3", "9184" },
		/* Group 2/3 facsimile */
	[18] = { "8890", "91A1" },
		/* Group 4 facsimile Class 1 */
	[19] = { "8890", "91A4" },
		/* Teletex service basic and mixed mode
		   and Group 4 facsimile service Classes II and III */
	[20] = { "8890", "91A8" },
		/* Teletex service basic and processable mode */
	[21] = { "8890", "91B1" },
		/* Teletex service basic mode */
	[22] = { "8890", "91B2" },
		/* International interworking for Videotex */
	[23] = { "8890", "91B5" },
		/* Telex */
	[24] = { "8890", "91B8" },
		/* Message Handling Systems in accordance with X.400 */
	[25] = { "8890", "91C1" },
		/* OSI application in accordance with X.200 */
	[26] = { "9190A5", "9181" },
		/* 7 kHz telephony */
	[27] = { "9190A5", "916001" },
		/* Video telephony, first connection */
	[28] = { "8890", "916002" },
		/* Video telephony, second connection */
};

/*
 * helper functions
 * ================
 */

/*
 * emit unsupported parameter warning
 */
static inline void ignore_cstruct_param(struct cardstate *cs, _cstruct param,
				       char *msgname, char *paramname)
{
	if (param && *param)
		dev_warn(cs->dev, "%s: ignoring unsupported parameter: %s\n",
			 msgname, paramname);
}

/*
 * convert hex to binary
 */
static inline u8 hex2bin(char c)
{
	int result = c & 0x0f;
	if (c & 0x40)
		result += 9;
	return result;
}

/*
 * convert an IE from Gigaset hex string to ETSI binary representation
 * including length byte
 * return value: result length, -1 on error
 */
static int encode_ie(char *in, u8 *out, int maxlen)
{
	int l = 0;
	while (*in) {
		if (!isxdigit(in[0]) || !isxdigit(in[1]) || l >= maxlen)
			return -1;
		out[++l] = (hex2bin(in[0]) << 4) + hex2bin(in[1]);
		in += 2;
	}
	out[0] = l;
	return l;
}

/*
 * convert an IE from ETSI binary representation including length byte
 * to Gigaset hex string
 */
static void decode_ie(u8 *in, char *out)
{
	int i = *in;
	while (i-- > 0) {
		/* ToDo: conversion to upper case necessary? */
		*out++ = toupper(hex_asc_hi(*++in));
		*out++ = toupper(hex_asc_lo(*in));
	}
}

/*
 * retrieve application data structure for an application ID
 */
static inline struct gigaset_capi_appl *
get_appl(struct gigaset_capi_ctr *iif, u16 appl)
{
	struct gigaset_capi_appl *ap;

	list_for_each_entry(ap, &iif->appls, ctrlist)
		if (ap->id == appl)
			return ap;
	return NULL;
}

/*
 * dump CAPI message to kernel messages for debugging
 */
static inline void dump_cmsg(enum debuglevel level, const char *tag, _cmsg *p)
{
#ifdef CONFIG_GIGASET_DEBUG
	_cdebbuf *cdb;

	if (!(gigaset_debuglevel & level))
		return;

	cdb = capi_cmsg2str(p);
	if (cdb) {
		gig_dbg(level, "%s: [%d] %s", tag, p->ApplId, cdb->buf);
		cdebbuf_free(cdb);
	} else {
		gig_dbg(level, "%s: [%d] %s", tag, p->ApplId,
			capi_cmd2str(p->Command, p->Subcommand));
	}
#endif
}

static inline void dump_rawmsg(enum debuglevel level, const char *tag,
			       unsigned char *data)
{
#ifdef CONFIG_GIGASET_DEBUG
	char *dbgline;
	int i, l;

	if (!(gigaset_debuglevel & level))
		return;

	l = CAPIMSG_LEN(data);
	if (l < 12) {
		gig_dbg(level, "%s: ??? LEN=%04d", tag, l);
		return;
	}
	gig_dbg(level, "%s: 0x%02x:0x%02x: ID=%03d #0x%04x LEN=%04d NCCI=0x%x",
		tag, CAPIMSG_COMMAND(data), CAPIMSG_SUBCOMMAND(data),
		CAPIMSG_APPID(data), CAPIMSG_MSGID(data), l,
		CAPIMSG_CONTROL(data));
	l -= 12;
	dbgline = kmalloc(3*l, GFP_ATOMIC);
	if (!dbgline)
		return;
	for (i = 0; i < l; i++) {
		dbgline[3*i] = hex_asc_hi(data[12+i]);
		dbgline[3*i+1] = hex_asc_lo(data[12+i]);
		dbgline[3*i+2] = ' ';
	}
	dbgline[3*l-1] = '\0';
	gig_dbg(level, "  %s", dbgline);
	kfree(dbgline);
	if (CAPIMSG_COMMAND(data) == CAPI_DATA_B3 &&
	    (CAPIMSG_SUBCOMMAND(data) == CAPI_REQ ||
	     CAPIMSG_SUBCOMMAND(data) == CAPI_IND) &&
	    CAPIMSG_DATALEN(data) > 0) {
		l = CAPIMSG_DATALEN(data);
		dbgline = kmalloc(3*l, GFP_ATOMIC);
		if (!dbgline)
			return;
		data += CAPIMSG_LEN(data);
		for (i = 0; i < l; i++) {
			dbgline[3*i] = hex_asc_hi(data[i]);
			dbgline[3*i+1] = hex_asc_lo(data[i]);
			dbgline[3*i+2] = ' ';
		}
		dbgline[3*l-1] = '\0';
		gig_dbg(level, "  %s", dbgline);
		kfree(dbgline);
	}
#endif
}

/*
 * format CAPI IE as string
 */

static const char *format_ie(const char *ie)
{
	static char result[3*MAX_FMT_IE_LEN];
	int len, count;
	char *pout = result;

	if (!ie)
		return "NULL";

	count = len = ie[0];
	if (count > MAX_FMT_IE_LEN)
		count = MAX_FMT_IE_LEN-1;
	while (count--) {
		*pout++ = hex_asc_hi(*++ie);
		*pout++ = hex_asc_lo(*ie);
		*pout++ = ' ';
	}
	if (len > MAX_FMT_IE_LEN) {
		*pout++ = '.';
		*pout++ = '.';
		*pout++ = '.';
	}
	*--pout = 0;
	return result;
}


/*
 * driver interface functions
 * ==========================
 */

/**
 * gigaset_skb_sent() - acknowledge transmission of outgoing skb
 * @bcs:	B channel descriptor structure.
 * @skb:	sent data.
 *
 * Called by hardware module {bas,ser,usb}_gigaset when the data in a
 * skb has been successfully sent, for signalling completion to the LL.
 */
void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *dskb)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct gigaset_capi_appl *ap = bcs->ap;
	unsigned char *req = skb_mac_header(dskb);
	struct sk_buff *cskb;
	u16 flags;

	/* update statistics */
	++bcs->trans_up;

	if (!ap) {
		dev_err(cs->dev, "%s: no application\n", __func__);
		return;
	}

	/* don't send further B3 messages if disconnected */
	if (ap->connected < APCONN_ACTIVE) {
		gig_dbg(DEBUG_LLDATA, "disconnected, discarding ack");
		return;
	}

	/* ToDo: honor unset "delivery confirmation" bit */
	flags = CAPIMSG_FLAGS(req);

	/* build DATA_B3_CONF message */
	cskb = alloc_skb(CAPI_DATA_B3_CONF_LEN, GFP_ATOMIC);
	if (!cskb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	/* frequent message, avoid _cmsg overhead */
	CAPIMSG_SETLEN(cskb->data, CAPI_DATA_B3_CONF_LEN);
	CAPIMSG_SETAPPID(cskb->data, ap->id);
	CAPIMSG_SETCOMMAND(cskb->data, CAPI_DATA_B3);
	CAPIMSG_SETSUBCOMMAND(cskb->data,  CAPI_CONF);
	CAPIMSG_SETMSGID(cskb->data, CAPIMSG_MSGID(req));
	CAPIMSG_SETCONTROLLER(cskb->data, iif->ctr.cnr);
	CAPIMSG_SETPLCI_PART(cskb->data, bcs->channel + 1);
	CAPIMSG_SETNCCI_PART(cskb->data, 1);
	CAPIMSG_SETHANDLE_CONF(cskb->data, CAPIMSG_HANDLE_REQ(req));
	if (flags & ~CAPI_FLAGS_DELIVERY_CONFIRMATION)
		CAPIMSG_SETINFO_CONF(cskb->data,
				     CapiFlagsNotSupportedByProtocol);
	else
		CAPIMSG_SETINFO_CONF(cskb->data, CAPI_NOERROR);

	/* emit message */
	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_CONF", cskb->data);
	capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
}
EXPORT_SYMBOL_GPL(gigaset_skb_sent);

/**
 * gigaset_skb_rcvd() - pass received skb to LL
 * @bcs:	B channel descriptor structure.
 * @skb:	received data.
 *
 * Called by hardware module {bas,ser,usb}_gigaset when user data has
 * been successfully received, for passing to the LL.
 * Warning: skb must not be accessed anymore!
 */
void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct gigaset_capi_appl *ap = bcs->ap;
	int len = skb->len;

	/* update statistics */
	bcs->trans_down++;

	if (!ap) {
		dev_err(cs->dev, "%s: no application\n", __func__);
		return;
	}

	/* don't send further B3 messages if disconnected */
	if (ap->connected < APCONN_ACTIVE) {
		gig_dbg(DEBUG_LLDATA, "disconnected, discarding data");
		dev_kfree_skb_any(skb);
		return;
	}

	/*
	 * prepend DATA_B3_IND message to payload
	 * Parameters: NCCI = 1, all others 0/unused
	 * frequent message, avoid _cmsg overhead
	 */
	skb_push(skb, CAPI_DATA_B3_REQ_LEN);
	CAPIMSG_SETLEN(skb->data, CAPI_DATA_B3_REQ_LEN);
	CAPIMSG_SETAPPID(skb->data, ap->id);
	CAPIMSG_SETCOMMAND(skb->data, CAPI_DATA_B3);
	CAPIMSG_SETSUBCOMMAND(skb->data,  CAPI_IND);
	CAPIMSG_SETMSGID(skb->data, ap->nextMessageNumber++);
	CAPIMSG_SETCONTROLLER(skb->data, iif->ctr.cnr);
	CAPIMSG_SETPLCI_PART(skb->data, bcs->channel + 1);
	CAPIMSG_SETNCCI_PART(skb->data, 1);
	/* Data parameter not used */
	CAPIMSG_SETDATALEN(skb->data, len);
	/* Data handle parameter not used */
	CAPIMSG_SETFLAGS(skb->data, 0);
	/* Data64 parameter not present */

	/* emit message */
	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_IND", skb->data);
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}
EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);

/**
 * gigaset_isdn_rcv_err() - signal receive error
 * @bcs:	B channel descriptor structure.
 *
 * Called by hardware module {bas,ser,usb}_gigaset when a receive error
 * has occurred, for signalling to the LL.
 */
void gigaset_isdn_rcv_err(struct bc_state *bcs)
{
	/* if currently ignoring packets, just count down */
	if (bcs->ignore) {
		bcs->ignore--;
		return;
	}

	/* update statistics */
	bcs->corrupted++;

	/* ToDo: signal error -> LL */
}
EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);

/**
 * gigaset_isdn_icall() - signal incoming call
 * @at_state:	connection state structure.
 *
 * Called by main module at tasklet level to notify the LL that an incoming
 * call has been received. @at_state contains the parameters of the call.
 *
 * Return value: call disposition (ICALL_*)
 */
int gigaset_isdn_icall(struct at_state_t *at_state)
{
	struct cardstate *cs = at_state->cs;
	struct bc_state *bcs = at_state->bcs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct gigaset_capi_appl *ap;
	u32 actCIPmask;
	struct sk_buff *skb;
	unsigned int msgsize;
	int i;

	/*
	 * ToDo: signal calls without a free B channel, too
	 * (requires a u8 handle for the at_state structure that can
	 * be stored in the PLCI and used in the CONNECT_RESP message
	 * handler to retrieve it)
	 */
	if (!bcs)
		return ICALL_IGNORE;

	/* prepare CONNECT_IND message, using B channel number as PLCI */
	capi_cmsg_header(&iif->hcmsg, 0, CAPI_CONNECT, CAPI_IND, 0,
			 iif->ctr.cnr | ((bcs->channel + 1) << 8));

	/* minimum size, all structs empty */
	msgsize = CAPI_CONNECT_IND_BASELEN;

	/* Bearer Capability (mandatory) */
	if (at_state->str_var[STR_ZBC]) {
		/* pass on BC from Gigaset */
		if (encode_ie(at_state->str_var[STR_ZBC], iif->bc_buf,
			      MAX_BC_OCTETS) < 0) {
			dev_warn(cs->dev, "RING ignored - bad BC %s\n",
				 at_state->str_var[STR_ZBC]);
			return ICALL_IGNORE;
		}

		/* look up corresponding CIP value */
		iif->hcmsg.CIPValue = 0;	/* default if nothing found */
		for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
			if (cip2bchlc[i].bc != NULL &&
			    cip2bchlc[i].hlc == NULL &&
			    !strcmp(cip2bchlc[i].bc,
				    at_state->str_var[STR_ZBC])) {
				iif->hcmsg.CIPValue = i;
				break;
			}
	} else {
		/* no BC (internal call): assume CIP 1 (speech, A-law) */
		iif->hcmsg.CIPValue = 1;
		encode_ie(cip2bchlc[1].bc, iif->bc_buf, MAX_BC_OCTETS);
	}
	iif->hcmsg.BC = iif->bc_buf;
	msgsize += iif->hcmsg.BC[0];

	/* High Layer Compatibility (optional) */
	if (at_state->str_var[STR_ZHLC]) {
		/* pass on HLC from Gigaset */
		if (encode_ie(at_state->str_var[STR_ZHLC], iif->hlc_buf,
			      MAX_HLC_OCTETS) < 0) {
			dev_warn(cs->dev, "RING ignored - bad HLC %s\n",
				 at_state->str_var[STR_ZHLC]);
			return ICALL_IGNORE;
		}
		iif->hcmsg.HLC = iif->hlc_buf;
		msgsize += iif->hcmsg.HLC[0];

		/* look up corresponding CIP value */
		/* keep BC based CIP value if none found */
		if (at_state->str_var[STR_ZBC])
			for (i = 0; i < ARRAY_SIZE(cip2bchlc); i++)
				if (cip2bchlc[i].hlc != NULL &&
				    !strcmp(cip2bchlc[i].hlc,
					    at_state->str_var[STR_ZHLC]) &&
				    !strcmp(cip2bchlc[i].bc,
					    at_state->str_var[STR_ZBC])) {
					iif->hcmsg.CIPValue = i;
					break;
				}
	}

	/* Called Party Number (optional) */
	if (at_state->str_var[STR_ZCPN]) {
		i = strlen(at_state->str_var[STR_ZCPN]);
		if (i > MAX_NUMBER_DIGITS) {
			dev_warn(cs->dev, "RING ignored - bad number %s\n",
				 at_state->str_var[STR_ZBC]);
			return ICALL_IGNORE;
		}
		iif->cdpty_buf[0] = i + 1;
		iif->cdpty_buf[1] = 0x80; /* type / numbering plan unknown */
		memcpy(iif->cdpty_buf+2, at_state->str_var[STR_ZCPN], i);
		iif->hcmsg.CalledPartyNumber = iif->cdpty_buf;
		msgsize += iif->hcmsg.CalledPartyNumber[0];
	}

	/* Calling Party Number (optional) */
	if (at_state->str_var[STR_NMBR]) {
		i = strlen(at_state->str_var[STR_NMBR]);
		if (i > MAX_NUMBER_DIGITS) {
			dev_warn(cs->dev, "RING ignored - bad number %s\n",
				 at_state->str_var[STR_ZBC]);
			return ICALL_IGNORE;
		}
		iif->cgpty_buf[0] = i + 2;
		iif->cgpty_buf[1] = 0x00; /* type / numbering plan unknown */
		iif->cgpty_buf[2] = 0x80; /* pres. allowed, not screened */
		memcpy(iif->cgpty_buf+3, at_state->str_var[STR_NMBR], i);
		iif->hcmsg.CallingPartyNumber = iif->cgpty_buf;
		msgsize += iif->hcmsg.CallingPartyNumber[0];
	}

	/* remaining parameters (not supported, always left NULL):
	 * - CalledPartySubaddress
	 * - CallingPartySubaddress
	 * - AdditionalInfo
	 *   - BChannelinformation
	 *   - Keypadfacility
	 *   - Useruserdata
	 *   - Facilitydataarray
	 */

	gig_dbg(DEBUG_CMD, "icall: PLCI %x CIP %d BC %s",
		iif->hcmsg.adr.adrPLCI, iif->hcmsg.CIPValue,
		format_ie(iif->hcmsg.BC));
	gig_dbg(DEBUG_CMD, "icall: HLC %s",
		format_ie(iif->hcmsg.HLC));
	gig_dbg(DEBUG_CMD, "icall: CgPty %s",
		format_ie(iif->hcmsg.CallingPartyNumber));
	gig_dbg(DEBUG_CMD, "icall: CdPty %s",
		format_ie(iif->hcmsg.CalledPartyNumber));

	/* scan application list for matching listeners */
	bcs->ap = NULL;
	actCIPmask = 1 | (1 << iif->hcmsg.CIPValue);
	list_for_each_entry(ap, &iif->appls, ctrlist)
		if (actCIPmask & ap->listenCIPmask) {
			/* build CONNECT_IND message for this application */
			iif->hcmsg.ApplId = ap->id;
			iif->hcmsg.Messagenumber = ap->nextMessageNumber++;

			skb = alloc_skb(msgsize, GFP_ATOMIC);
			if (!skb) {
				dev_err(cs->dev, "%s: out of memory\n",
					__func__);
				break;
			}
			capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
			dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);

			/* add to listeners on this B channel, update state */
			ap->bcnext = bcs->ap;
			bcs->ap = ap;
			bcs->chstate |= CHS_NOTIFY_LL;
			ap->connected = APCONN_SETUP;

			/* emit message */
			capi_ctr_handle_message(&iif->ctr, ap->id, skb);
		}

	/*
	 * Return "accept" if any listeners.
	 * Gigaset will send ALERTING.
	 * There doesn't seem to be a way to avoid this.
	 */
	return bcs->ap ? ICALL_ACCEPT : ICALL_IGNORE;
}

/*
 * send a DISCONNECT_IND message to an application
 * does not sleep, clobbers the controller's hcmsg structure
 */
static void send_disconnect_ind(struct bc_state *bcs,
				struct gigaset_capi_appl *ap, u16 reason)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct sk_buff *skb;

	if (ap->connected == APCONN_NONE)
		return;

	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT, CAPI_IND,
			 ap->nextMessageNumber++,
			 iif->ctr.cnr | ((bcs->channel + 1) << 8));
	iif->hcmsg.Reason = reason;
	skb = alloc_skb(CAPI_DISCONNECT_IND_LEN, GFP_ATOMIC);
	if (!skb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, CAPI_DISCONNECT_IND_LEN));
	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
	ap->connected = APCONN_NONE;
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/*
 * send a DISCONNECT_B3_IND message to an application
 * Parameters: NCCI = 1, NCPI empty, Reason_B3 = 0
 * does not sleep, clobbers the controller's hcmsg structure
 */
static void send_disconnect_b3_ind(struct bc_state *bcs,
				   struct gigaset_capi_appl *ap)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct sk_buff *skb;

	/* nothing to do if no logical connection active */
	if (ap->connected < APCONN_ACTIVE)
		return;
	ap->connected = APCONN_SETUP;

	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
			 ap->nextMessageNumber++,
			 iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
	skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_ATOMIC);
	if (!skb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	capi_cmsg2message(&iif->hcmsg,
			  __skb_put(skb, CAPI_DISCONNECT_B3_IND_BASELEN));
	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/**
 * gigaset_isdn_connD() - signal D channel connect
 * @bcs:	B channel descriptor structure.
 *
 * Called by main module at tasklet level to notify the LL that the D channel
 * connection has been established.
 */
void gigaset_isdn_connD(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct gigaset_capi_appl *ap = bcs->ap;
	struct sk_buff *skb;
	unsigned int msgsize;

	if (!ap) {
		dev_err(cs->dev, "%s: no application\n", __func__);
		return;
	}
	while (ap->bcnext) {
		/* this should never happen */
		dev_warn(cs->dev, "%s: dropping extra application %u\n",
			 __func__, ap->bcnext->id);
		send_disconnect_ind(bcs, ap->bcnext,
				    CapiCallGivenToOtherApplication);
		ap->bcnext = ap->bcnext->bcnext;
	}
	if (ap->connected == APCONN_NONE) {
		dev_warn(cs->dev, "%s: application %u not connected\n",
			 __func__, ap->id);
		return;
	}

	/* prepare CONNECT_ACTIVE_IND message
	 * Note: LLC not supported by device
	 */
	capi_cmsg_header(&iif->hcmsg, ap->id, CAPI_CONNECT_ACTIVE, CAPI_IND,
			 ap->nextMessageNumber++,
			 iif->ctr.cnr | ((bcs->channel + 1) << 8));

	/* minimum size, all structs empty */
	msgsize = CAPI_CONNECT_ACTIVE_IND_BASELEN;

	/* ToDo: set parameter: Connected number
	 * (requires ev-layer state machine extension to collect
	 * ZCON device reply)
	 */

	/* build and emit CONNECT_ACTIVE_IND message */
	skb = alloc_skb(msgsize, GFP_ATOMIC);
	if (!skb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/**
 * gigaset_isdn_hupD() - signal D channel hangup
 * @bcs:	B channel descriptor structure.
 *
 * Called by main module at tasklet level to notify the LL that the D channel
 * connection has been shut down.
 */
void gigaset_isdn_hupD(struct bc_state *bcs)
{
	struct gigaset_capi_appl *ap;

	/*
	 * ToDo: pass on reason code reported by device
	 * (requires ev-layer state machine extension to collect
	 * ZCAU device reply)
	 */
	for (ap = bcs->ap; ap != NULL; ap = ap->bcnext) {
		send_disconnect_b3_ind(bcs, ap);
		send_disconnect_ind(bcs, ap, 0);
	}
	bcs->ap = NULL;
}

/**
 * gigaset_isdn_connB() - signal B channel connect
 * @bcs:	B channel descriptor structure.
 *
 * Called by main module at tasklet level to notify the LL that the B channel
 * connection has been established.
 */
void gigaset_isdn_connB(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_ctr *iif = cs->iif;
	struct gigaset_capi_appl *ap = bcs->ap;
	struct sk_buff *skb;
	unsigned int msgsize;
	u8 command;

	if (!ap) {
		dev_err(cs->dev, "%s: no application\n", __func__);
		return;
	}
	while (ap->bcnext) {
		/* this should never happen */
		dev_warn(cs->dev, "%s: dropping extra application %u\n",
			 __func__, ap->bcnext->id);
		send_disconnect_ind(bcs, ap->bcnext,
				    CapiCallGivenToOtherApplication);
		ap->bcnext = ap->bcnext->bcnext;
	}
	if (!ap->connected) {
		dev_warn(cs->dev, "%s: application %u not connected\n",
			 __func__, ap->id);
		return;
	}

	/*
	 * emit CONNECT_B3_ACTIVE_IND if we already got CONNECT_B3_REQ;
	 * otherwise we have to emit CONNECT_B3_IND first, and follow up with
	 * CONNECT_B3_ACTIVE_IND in reply to CONNECT_B3_RESP
	 * Parameters in both cases always: NCCI = 1, NCPI empty
	 */
	if (ap->connected >= APCONN_ACTIVE) {
		command = CAPI_CONNECT_B3_ACTIVE;
		msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
	} else {
		command = CAPI_CONNECT_B3;
		msgsize = CAPI_CONNECT_B3_IND_BASELEN;
	}
	capi_cmsg_header(&iif->hcmsg, ap->id, command, CAPI_IND,
			 ap->nextMessageNumber++,
			 iif->ctr.cnr | ((bcs->channel + 1) << 8) | (1 << 16));
	skb = alloc_skb(msgsize, GFP_ATOMIC);
	if (!skb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	capi_cmsg2message(&iif->hcmsg, __skb_put(skb, msgsize));
	dump_cmsg(DEBUG_CMD, __func__, &iif->hcmsg);
	ap->connected = APCONN_ACTIVE;
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/**
 * gigaset_isdn_hupB() - signal B channel hangup
 * @bcs:	B channel descriptor structure.
 *
 * Called by main module to notify the LL that the B channel connection has
 * been shut down.
 */
void gigaset_isdn_hupB(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;
	struct gigaset_capi_appl *ap = bcs->ap;

	/* ToDo: assure order of DISCONNECT_B3_IND and DISCONNECT_IND ? */

	if (!ap) {
		dev_err(cs->dev, "%s: no application\n", __func__);
		return;
	}

	send_disconnect_b3_ind(bcs, ap);
}

/**
 * gigaset_isdn_start() - signal device availability
 * @cs:		device descriptor structure.
 *
 * Called by main module to notify the LL that the device is available for
 * use.
 */
void gigaset_isdn_start(struct cardstate *cs)
{
	struct gigaset_capi_ctr *iif = cs->iif;

	/* fill profile data: manufacturer name */
	strcpy(iif->ctr.manu, "Siemens");
	/* CAPI and device version */
	iif->ctr.version.majorversion = 2;		/* CAPI 2.0 */
	iif->ctr.version.minorversion = 0;
	/* ToDo: check/assert cs->gotfwver? */
	iif->ctr.version.majormanuversion = cs->fwver[0];
	iif->ctr.version.minormanuversion = cs->fwver[1];
	/* number of B channels supported */
	iif->ctr.profile.nbchannel = cs->channels;
	/* global options: internal controller, supplementary services */
	iif->ctr.profile.goptions = 0x11;
	/* B1 protocols: 64 kbit/s HDLC or transparent */
	iif->ctr.profile.support1 =  0x03;
	/* B2 protocols: transparent only */
	/* ToDo: X.75 SLP ? */
	iif->ctr.profile.support2 =  0x02;
	/* B3 protocols: transparent only */
	iif->ctr.profile.support3 =  0x01;
	/* no serial number */
	strcpy(iif->ctr.serial, "0");
	capi_ctr_ready(&iif->ctr);
}

/**
 * gigaset_isdn_stop() - signal device unavailability
 * @cs:		device descriptor structure.
 *
 * Called by main module to notify the LL that the device is no longer
 * available for use.
 */
void gigaset_isdn_stop(struct cardstate *cs)
{
	struct gigaset_capi_ctr *iif = cs->iif;
	capi_ctr_down(&iif->ctr);
}

/*
 * kernel CAPI callback methods
 * ============================
 */

/*
 * load firmware
 */
static int gigaset_load_firmware(struct capi_ctr *ctr, capiloaddata *data)
{
	struct cardstate *cs = ctr->driverdata;

	/* AVM specific operation, not needed for Gigaset -- ignore */
	dev_notice(cs->dev, "load_firmware ignored\n");

	return 0;
}

/*
 * reset (deactivate) controller
 */
static void gigaset_reset_ctr(struct capi_ctr *ctr)
{
	struct cardstate *cs = ctr->driverdata;

	/* AVM specific operation, not needed for Gigaset -- ignore */
	dev_notice(cs->dev, "reset_ctr ignored\n");
}

/*
 * register CAPI application
 */
static void gigaset_register_appl(struct capi_ctr *ctr, u16 appl,
			   capi_register_params *rp)
{
	struct gigaset_capi_ctr *iif
		= container_of(ctr, struct gigaset_capi_ctr, ctr);
	struct cardstate *cs = ctr->driverdata;
	struct gigaset_capi_appl *ap;

	list_for_each_entry(ap, &iif->appls, ctrlist)
		if (ap->id == appl) {
			dev_notice(cs->dev,
				   "application %u already registered\n", appl);
			return;
		}

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	ap->id = appl;

	list_add(&ap->ctrlist, &iif->appls);
}

/*
 * release CAPI application
 */
static void gigaset_release_appl(struct capi_ctr *ctr, u16 appl)
{
	struct gigaset_capi_ctr *iif
		= container_of(ctr, struct gigaset_capi_ctr, ctr);
	struct cardstate *cs = iif->ctr.driverdata;
	struct gigaset_capi_appl *ap, *tmp;

	list_for_each_entry_safe(ap, tmp, &iif->appls, ctrlist)
		if (ap->id == appl) {
			if (ap->connected != APCONN_NONE) {
				dev_err(cs->dev,
					"%s: application %u still connected\n",
					__func__, ap->id);
				/* ToDo: clear active connection */
			}
			list_del(&ap->ctrlist);
			kfree(ap);
		}

}

/*
 * =====================================================================
 * outgoing CAPI message handler
 * =====================================================================
 */

/*
 * helper function: emit reply message with given Info value
 */
static void send_conf(struct gigaset_capi_ctr *iif,
		      struct gigaset_capi_appl *ap,
		      struct sk_buff *skb,
		      u16 info)
{
	/*
	 * _CONF replies always only have NCCI and Info parameters
	 * so they'll fit into the _REQ message skb
	 */
	capi_cmsg_answer(&iif->acmsg);
	iif->acmsg.Info = info;
	capi_cmsg2message(&iif->acmsg, skb->data);
	__skb_trim(skb, CAPI_STDCONF_LEN);
	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/*
 * process FACILITY_REQ message
 */
static void do_facility_req(struct gigaset_capi_ctr *iif,
			    struct gigaset_capi_appl *ap,
			    struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	struct sk_buff *cskb;
	u8 *pparam;
	unsigned int msgsize = CAPI_FACILITY_CONF_BASELEN;
	u16 function, info;
	static u8 confparam[10];	/* max. 9 octets + length byte */

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/*
	 * Facility Request Parameter is not decoded by capi_message2cmsg()
	 * encoding depends on Facility Selector
	 */
	switch (cmsg->FacilitySelector) {
	case CAPI_FACILITY_DTMF:	/* ToDo */
		info = CapiFacilityNotSupported;
		confparam[0] = 2;	/* length */
		/* DTMF information: Unknown DTMF request */
		capimsg_setu16(confparam, 1, 2);
		break;

	case CAPI_FACILITY_V42BIS:	/* not supported */
		info = CapiFacilityNotSupported;
		confparam[0] = 2;	/* length */
		/* V.42 bis information: not available */
		capimsg_setu16(confparam, 1, 1);
		break;

	case CAPI_FACILITY_SUPPSVC:
		/* decode Function parameter */
		pparam = cmsg->FacilityRequestParameter;
		if (pparam == NULL || *pparam < 2) {
			dev_notice(cs->dev, "%s: %s missing\n", "FACILITY_REQ",
				   "Facility Request Parameter");
			send_conf(iif, ap, skb, CapiIllMessageParmCoding);
			return;
		}
		function = CAPIMSG_U16(pparam, 1);
		switch (function) {
		case CAPI_SUPPSVC_GETSUPPORTED:
			info = CapiSuccess;
			/* Supplementary Service specific parameter */
			confparam[3] = 6;	/* length */
			/* Supplementary services info: Success */
			capimsg_setu16(confparam, 4, CapiSuccess);
			/* Supported Services: none */
			capimsg_setu32(confparam, 6, 0);
			break;
		/* ToDo: add supported services */
		default:
			info = CapiFacilitySpecificFunctionNotSupported;
			/* Supplementary Service specific parameter */
			confparam[3] = 2;	/* length */
			/* Supplementary services info: not supported */
			capimsg_setu16(confparam, 4,
				       CapiSupplementaryServiceNotSupported);
		}

		/* Facility confirmation parameter */
		confparam[0] = confparam[3] + 3;	/* total length */
		/* Function: copy from _REQ message */
		capimsg_setu16(confparam, 1, function);
		/* Supplementary Service specific parameter already set above */
		break;

	case CAPI_FACILITY_WAKEUP:	/* ToDo */
		info = CapiFacilityNotSupported;
		confparam[0] = 2;	/* length */
		/* Number of accepted awake request parameters: 0 */
		capimsg_setu16(confparam, 1, 0);
		break;

	default:
		info = CapiFacilityNotSupported;
		confparam[0] = 0;	/* empty struct */
	}

	/* send FACILITY_CONF with given Info and confirmation parameter */
	capi_cmsg_answer(cmsg);
	cmsg->Info = info;
	cmsg->FacilityConfirmationParameter = confparam;
	msgsize += confparam[0];	/* length */
	cskb = alloc_skb(msgsize, GFP_ATOMIC);
	if (!cskb) {
		dev_err(cs->dev, "%s: out of memory\n", __func__);
		return;
	}
	capi_cmsg2message(cmsg, __skb_put(cskb, msgsize));
	dump_cmsg(DEBUG_CMD, __func__, cmsg);
	capi_ctr_handle_message(&iif->ctr, ap->id, cskb);
}


/*
 * process LISTEN_REQ message
 * just store the masks in the application data structure
 */
static void do_listen_req(struct gigaset_capi_ctr *iif,
			  struct gigaset_capi_appl *ap,
			  struct sk_buff *skb)
{
	/* decode message */
	capi_message2cmsg(&iif->acmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);

	/* store listening parameters */
	ap->listenInfoMask = iif->acmsg.InfoMask;
	ap->listenCIPmask = iif->acmsg.CIPmask;
	send_conf(iif, ap, skb, CapiSuccess);
}

/*
 * process ALERT_REQ message
 * nothing to do, Gigaset always alerts anyway
 */
static void do_alert_req(struct gigaset_capi_ctr *iif,
			 struct gigaset_capi_appl *ap,
			 struct sk_buff *skb)
{
	/* decode message */
	capi_message2cmsg(&iif->acmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
	send_conf(iif, ap, skb, CapiAlertAlreadySent);
}

/*
 * process CONNECT_REQ message
 * allocate a B channel, prepare dial commands, queue a DIAL event,
 * emit CONNECT_CONF reply
 */
static void do_connect_req(struct gigaset_capi_ctr *iif,
			   struct gigaset_capi_appl *ap,
			   struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	struct bc_state *bcs;
	char **commands;
	char *s;
	u8 *pp;
	int i, l;
	u16 info;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/* get free B channel & construct PLCI */
	bcs = gigaset_get_free_channel(cs);
	if (!bcs) {
		dev_notice(cs->dev, "%s: no B channel available\n",
			   "CONNECT_REQ");
		send_conf(iif, ap, skb, CapiNoPlciAvailable);
		return;
	}
	ap->bcnext = NULL;
	bcs->ap = ap;
	cmsg->adr.adrPLCI |= (bcs->channel + 1) << 8;

	/* build command table */
	commands = kzalloc(AT_NUM*(sizeof *commands), GFP_KERNEL);
	if (!commands)
		goto oom;

	/* encode parameter: Called party number */
	pp = cmsg->CalledPartyNumber;
	if (pp == NULL || *pp == 0) {
		dev_notice(cs->dev, "%s: %s missing\n",
			   "CONNECT_REQ", "Called party number");
		info = CapiIllMessageParmCoding;
		goto error;
	}
	l = *pp++;
	/* check type of number/numbering plan byte */
	switch (*pp) {
	case 0x80:	/* unknown type / unknown numbering plan */
	case 0x81:	/* unknown type / ISDN/Telephony numbering plan */
		break;
	default:	/* others: warn about potential misinterpretation */
		dev_notice(cs->dev, "%s: %s type/plan 0x%02x unsupported\n",
			   "CONNECT_REQ", "Called party number", *pp);
	}
	pp++;
	l--;
	/* translate "**" internal call prefix to CTP value */
	if (l >= 2 && pp[0] == '*' && pp[1] == '*') {
		s = "^SCTP=0\r";
		pp += 2;
		l -= 2;
	} else {
		s = "^SCTP=1\r";
	}
	commands[AT_TYPE] = kstrdup(s, GFP_KERNEL);
	if (!commands[AT_TYPE])
		goto oom;
	commands[AT_DIAL] = kmalloc(l+3, GFP_KERNEL);
	if (!commands[AT_DIAL])
		goto oom;
	snprintf(commands[AT_DIAL], l+3, "D%.*s\r", l, pp);

	/* encode parameter: Calling party number */
	pp = cmsg->CallingPartyNumber;
	if (pp != NULL && *pp > 0) {
		l = *pp++;

		/* check type of number/numbering plan byte */
		/* ToDo: allow for/handle Ext=1? */
		switch (*pp) {
		case 0x00:	/* unknown type / unknown numbering plan */
		case 0x01:	/* unknown type / ISDN/Telephony num. plan */
			break;
		default:
			dev_notice(cs->dev,
				   "%s: %s type/plan 0x%02x unsupported\n",
				   "CONNECT_REQ", "Calling party number", *pp);
		}
		pp++;
		l--;

		/* check presentation indicator */
		if (!l) {
			dev_notice(cs->dev, "%s: %s IE truncated\n",
				   "CONNECT_REQ", "Calling party number");
			info = CapiIllMessageParmCoding;
			goto error;
		}
		switch (*pp & 0xfc) { /* ignore Screening indicator */
		case 0x80:	/* Presentation allowed */
			s = "^SCLIP=1\r";
			break;
		case 0xa0:	/* Presentation restricted */
			s = "^SCLIP=0\r";
			break;
		default:
			dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
				   "CONNECT_REQ",
				   "Presentation/Screening indicator",
				   *pp);
			s = "^SCLIP=1\r";
		}
		commands[AT_CLIP] = kstrdup(s, GFP_KERNEL);
		if (!commands[AT_CLIP])
			goto oom;
		pp++;
		l--;

		if (l) {
			/* number */
			commands[AT_MSN] = kmalloc(l+8, GFP_KERNEL);
			if (!commands[AT_MSN])
				goto oom;
			snprintf(commands[AT_MSN], l+8, "^SMSN=%*s\r", l, pp);
		}
	}

	/* check parameter: CIP Value */
	if (cmsg->CIPValue > ARRAY_SIZE(cip2bchlc) ||
	    (cmsg->CIPValue > 0 && cip2bchlc[cmsg->CIPValue].bc == NULL)) {
		dev_notice(cs->dev, "%s: unknown CIP value %d\n",
			   "CONNECT_REQ", cmsg->CIPValue);
		info = CapiCipValueUnknown;
		goto error;
	}

	/* check/encode parameter: BC */
	if (cmsg->BC && cmsg->BC[0]) {
		/* explicit BC overrides CIP */
		l = 2*cmsg->BC[0] + 7;
		commands[AT_BC] = kmalloc(l, GFP_KERNEL);
		if (!commands[AT_BC])
			goto oom;
		strcpy(commands[AT_BC], "^SBC=");
		decode_ie(cmsg->BC, commands[AT_BC]+5);
		strcpy(commands[AT_BC] + l - 2, "\r");
	} else if (cip2bchlc[cmsg->CIPValue].bc) {
		l = strlen(cip2bchlc[cmsg->CIPValue].bc) + 7;
		commands[AT_BC] = kmalloc(l, GFP_KERNEL);
		if (!commands[AT_BC])
			goto oom;
		snprintf(commands[AT_BC], l, "^SBC=%s\r",
			 cip2bchlc[cmsg->CIPValue].bc);
	}

	/* check/encode parameter: HLC */
	if (cmsg->HLC && cmsg->HLC[0]) {
		/* explicit HLC overrides CIP */
		l = 2*cmsg->HLC[0] + 7;
		commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
		if (!commands[AT_HLC])
			goto oom;
		strcpy(commands[AT_HLC], "^SHLC=");
		decode_ie(cmsg->HLC, commands[AT_HLC]+5);
		strcpy(commands[AT_HLC] + l - 2, "\r");
	} else if (cip2bchlc[cmsg->CIPValue].hlc) {
		l = strlen(cip2bchlc[cmsg->CIPValue].hlc) + 7;
		commands[AT_HLC] = kmalloc(l, GFP_KERNEL);
		if (!commands[AT_HLC])
			goto oom;
		snprintf(commands[AT_HLC], l, "^SHLC=%s\r",
			 cip2bchlc[cmsg->CIPValue].hlc);
	}

	/* check/encode parameter: B Protocol */
	if (cmsg->BProtocol == CAPI_DEFAULT) {
		bcs->proto2 = L2_HDLC;
		dev_warn(cs->dev,
		    "B2 Protocol X.75 SLP unsupported, using Transparent\n");
	} else {
		switch (cmsg->B1protocol) {
		case 0:
			bcs->proto2 = L2_HDLC;
			break;
		case 1:
			bcs->proto2 = L2_BITSYNC;
			break;
		default:
			dev_warn(cs->dev,
			    "B1 Protocol %u unsupported, using Transparent\n",
				 cmsg->B1protocol);
			bcs->proto2 = L2_BITSYNC;
		}
		if (cmsg->B2protocol != 1)
			dev_warn(cs->dev,
			    "B2 Protocol %u unsupported, using Transparent\n",
				 cmsg->B2protocol);
		if (cmsg->B3protocol != 0)
			dev_warn(cs->dev,
			    "B3 Protocol %u unsupported, using Transparent\n",
				 cmsg->B3protocol);
		ignore_cstruct_param(cs, cmsg->B1configuration,
					"CONNECT_REQ", "B1 Configuration");
		ignore_cstruct_param(cs, cmsg->B2configuration,
					"CONNECT_REQ", "B2 Configuration");
		ignore_cstruct_param(cs, cmsg->B3configuration,
					"CONNECT_REQ", "B3 Configuration");
	}
	commands[AT_PROTO] = kmalloc(9, GFP_KERNEL);
	if (!commands[AT_PROTO])
		goto oom;
	snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);

	/* ToDo: check/encode remaining parameters */
	ignore_cstruct_param(cs, cmsg->CalledPartySubaddress,
					"CONNECT_REQ", "Called pty subaddr");
	ignore_cstruct_param(cs, cmsg->CallingPartySubaddress,
					"CONNECT_REQ", "Calling pty subaddr");
	ignore_cstruct_param(cs, cmsg->LLC,
					"CONNECT_REQ", "LLC");
	if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
		ignore_cstruct_param(cs, cmsg->BChannelinformation,
					"CONNECT_REQ", "B Channel Information");
		ignore_cstruct_param(cs, cmsg->Keypadfacility,
					"CONNECT_REQ", "Keypad Facility");
		ignore_cstruct_param(cs, cmsg->Useruserdata,
					"CONNECT_REQ", "User-User Data");
		ignore_cstruct_param(cs, cmsg->Facilitydataarray,
					"CONNECT_REQ", "Facility Data Array");
	}

	/* encode parameter: B channel to use */
	commands[AT_ISO] = kmalloc(9, GFP_KERNEL);
	if (!commands[AT_ISO])
		goto oom;
	snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
		 (unsigned) bcs->channel + 1);

	/* queue & schedule EV_DIAL event */
	if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
			       bcs->at_state.seq_index, NULL)) {
		info = CAPI_MSGOSRESOURCEERR;
		goto error;
	}
	gigaset_schedule_event(cs);
	ap->connected = APCONN_SETUP;
	send_conf(iif, ap, skb, CapiSuccess);
	return;

oom:
	dev_err(cs->dev, "%s: out of memory\n", __func__);
	info = CAPI_MSGOSRESOURCEERR;
error:
	if (commands)
		for (i = 0; i < AT_NUM; i++)
			kfree(commands[i]);
	kfree(commands);
	gigaset_free_channel(bcs);
	send_conf(iif, ap, skb, info);
}

/*
 * process CONNECT_RESP message
 * checks protocol parameters and queues an ACCEPT or HUP event
 */
static void do_connect_resp(struct gigaset_capi_ctr *iif,
			    struct gigaset_capi_appl *ap,
			    struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	struct bc_state *bcs;
	struct gigaset_capi_appl *oap;
	int channel;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);
	dev_kfree_skb_any(skb);

	/* extract and check channel number from PLCI */
	channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
	if (!channel || channel > cs->channels) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "CONNECT_RESP", "PLCI", cmsg->adr.adrPLCI);
		return;
	}
	bcs = cs->bcs + channel - 1;

	switch (cmsg->Reject) {
	case 0:		/* Accept */
		/* drop all competing applications, keep only this one */
		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
			if (oap != ap)
				send_disconnect_ind(bcs, oap,
					CapiCallGivenToOtherApplication);
		ap->bcnext = NULL;
		bcs->ap = ap;
		bcs->chstate |= CHS_NOTIFY_LL;

		/* check/encode B channel protocol */
		if (cmsg->BProtocol == CAPI_DEFAULT) {
			bcs->proto2 = L2_HDLC;
			dev_warn(cs->dev,
		"B2 Protocol X.75 SLP unsupported, using Transparent\n");
		} else {
			switch (cmsg->B1protocol) {
			case 0:
				bcs->proto2 = L2_HDLC;
				break;
			case 1:
				bcs->proto2 = L2_BITSYNC;
				break;
			default:
				dev_warn(cs->dev,
			"B1 Protocol %u unsupported, using Transparent\n",
					 cmsg->B1protocol);
				bcs->proto2 = L2_BITSYNC;
			}
			if (cmsg->B2protocol != 1)
				dev_warn(cs->dev,
			"B2 Protocol %u unsupported, using Transparent\n",
					 cmsg->B2protocol);
			if (cmsg->B3protocol != 0)
				dev_warn(cs->dev,
			"B3 Protocol %u unsupported, using Transparent\n",
					 cmsg->B3protocol);
			ignore_cstruct_param(cs, cmsg->B1configuration,
					"CONNECT_RESP", "B1 Configuration");
			ignore_cstruct_param(cs, cmsg->B2configuration,
					"CONNECT_RESP", "B2 Configuration");
			ignore_cstruct_param(cs, cmsg->B3configuration,
					"CONNECT_RESP", "B3 Configuration");
		}

		/* ToDo: check/encode remaining parameters */
		ignore_cstruct_param(cs, cmsg->ConnectedNumber,
					"CONNECT_RESP", "Connected Number");
		ignore_cstruct_param(cs, cmsg->ConnectedSubaddress,
					"CONNECT_RESP", "Connected Subaddress");
		ignore_cstruct_param(cs, cmsg->LLC,
					"CONNECT_RESP", "LLC");
		if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
			ignore_cstruct_param(cs, cmsg->BChannelinformation,
					"CONNECT_RESP", "BChannel Information");
			ignore_cstruct_param(cs, cmsg->Keypadfacility,
					"CONNECT_RESP", "Keypad Facility");
			ignore_cstruct_param(cs, cmsg->Useruserdata,
					"CONNECT_RESP", "User-User Data");
			ignore_cstruct_param(cs, cmsg->Facilitydataarray,
					"CONNECT_RESP", "Facility Data Array");
		}

		/* Accept call */
		if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
				       EV_ACCEPT, NULL, 0, NULL))
			return;
		gigaset_schedule_event(cs);
		return;

	case 1:			/* Ignore */
		/* send DISCONNECT_IND to this application */
		send_disconnect_ind(bcs, ap, 0);

		/* remove it from the list of listening apps */
		if (bcs->ap == ap) {
			bcs->ap = ap->bcnext;
			if (bcs->ap == NULL)
				/* last one: stop ev-layer hupD notifications */
				bcs->chstate &= ~CHS_NOTIFY_LL;
			return;
		}
		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext) {
			if (oap->bcnext == ap) {
				oap->bcnext = oap->bcnext->bcnext;
				return;
			}
		}
		dev_err(cs->dev, "%s: application %u not found\n",
			__func__, ap->id);
		return;

	default:		/* Reject */
		/* drop all competing applications, keep only this one */
		for (oap = bcs->ap; oap != NULL; oap = oap->bcnext)
			if (oap != ap)
				send_disconnect_ind(bcs, oap,
					CapiCallGivenToOtherApplication);
		ap->bcnext = NULL;
		bcs->ap = ap;

		/* reject call - will trigger DISCONNECT_IND for this app */
		dev_info(cs->dev, "%s: Reject=%x\n",
			 "CONNECT_RESP", cmsg->Reject);
		if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
				       EV_HUP, NULL, 0, NULL))
			return;
		gigaset_schedule_event(cs);
		return;
	}
}

/*
 * process CONNECT_B3_REQ message
 * build NCCI and emit CONNECT_B3_CONF reply
 */
static void do_connect_b3_req(struct gigaset_capi_ctr *iif,
			      struct gigaset_capi_appl *ap,
			      struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	int channel;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/* extract and check channel number from PLCI */
	channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
	if (!channel || channel > cs->channels) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "CONNECT_B3_REQ", "PLCI", cmsg->adr.adrPLCI);
		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
		return;
	}

	/* mark logical connection active */
	ap->connected = APCONN_ACTIVE;

	/* build NCCI: always 1 (one B3 connection only) */
	cmsg->adr.adrNCCI |= 1 << 16;

	/* NCPI parameter: not applicable for B3 Transparent */
	ignore_cstruct_param(cs, cmsg->NCPI, "CONNECT_B3_REQ", "NCPI");
	send_conf(iif, ap, skb, (cmsg->NCPI && cmsg->NCPI[0]) ?
				CapiNcpiNotSupportedByProtocol : CapiSuccess);
}

/*
 * process CONNECT_B3_RESP message
 * Depending on the Reject parameter, either emit CONNECT_B3_ACTIVE_IND
 * or queue EV_HUP and emit DISCONNECT_B3_IND.
 * The emitted message is always shorter than the received one,
 * allowing to reuse the skb.
 */
static void do_connect_b3_resp(struct gigaset_capi_ctr *iif,
			       struct gigaset_capi_appl *ap,
			       struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	struct bc_state *bcs;
	int channel;
	unsigned int msgsize;
	u8 command;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/* extract and check channel number and NCCI */
	channel = (cmsg->adr.adrNCCI >> 8) & 0xff;
	if (!channel || channel > cs->channels ||
	    ((cmsg->adr.adrNCCI >> 16) & 0xffff) != 1) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "CONNECT_B3_RESP", "NCCI", cmsg->adr.adrNCCI);
		dev_kfree_skb_any(skb);
		return;
	}
	bcs = &cs->bcs[channel-1];

	if (cmsg->Reject) {
		/* Reject: clear B3 connect received flag */
		ap->connected = APCONN_SETUP;

		/* trigger hangup, causing eventual DISCONNECT_IND */
		if (!gigaset_add_event(cs, &bcs->at_state,
				       EV_HUP, NULL, 0, NULL)) {
			dev_kfree_skb_any(skb);
			return;
		}
		gigaset_schedule_event(cs);

		/* emit DISCONNECT_B3_IND */
		command = CAPI_DISCONNECT_B3;
		msgsize = CAPI_DISCONNECT_B3_IND_BASELEN;
	} else {
		/*
		 * Accept: emit CONNECT_B3_ACTIVE_IND immediately, as
		 * we only send CONNECT_B3_IND if the B channel is up
		 */
		command = CAPI_CONNECT_B3_ACTIVE;
		msgsize = CAPI_CONNECT_B3_ACTIVE_IND_BASELEN;
	}
	capi_cmsg_header(cmsg, ap->id, command, CAPI_IND,
			 ap->nextMessageNumber++, cmsg->adr.adrNCCI);
	__skb_trim(skb, msgsize);
	capi_cmsg2message(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);
	capi_ctr_handle_message(&iif->ctr, ap->id, skb);
}

/*
 * process DISCONNECT_REQ message
 * schedule EV_HUP and emit DISCONNECT_B3_IND if necessary,
 * emit DISCONNECT_CONF reply
 */
static void do_disconnect_req(struct gigaset_capi_ctr *iif,
			      struct gigaset_capi_appl *ap,
			      struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	struct bc_state *bcs;
	_cmsg *b3cmsg;
	struct sk_buff *b3skb;
	int channel;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/* extract and check channel number from PLCI */
	channel = (cmsg->adr.adrPLCI >> 8) & 0xff;
	if (!channel || channel > cs->channels) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "DISCONNECT_REQ", "PLCI", cmsg->adr.adrPLCI);
		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
		return;
	}
	bcs = cs->bcs + channel - 1;

	/* ToDo: process parameter: Additional info */
	if (cmsg->AdditionalInfo != CAPI_DEFAULT) {
		ignore_cstruct_param(cs, cmsg->BChannelinformation,
				     "DISCONNECT_REQ", "B Channel Information");
		ignore_cstruct_param(cs, cmsg->Keypadfacility,
				     "DISCONNECT_REQ", "Keypad Facility");
		ignore_cstruct_param(cs, cmsg->Useruserdata,
				     "DISCONNECT_REQ", "User-User Data");
		ignore_cstruct_param(cs, cmsg->Facilitydataarray,
				     "DISCONNECT_REQ", "Facility Data Array");
	}

	/* skip if DISCONNECT_IND already sent */
	if (!ap->connected)
		return;

	/* check for active logical connection */
	if (ap->connected >= APCONN_ACTIVE) {
		/*
		 * emit DISCONNECT_B3_IND with cause 0x3301
		 * use separate cmsg structure, as the content of iif->acmsg
		 * is still needed for creating the _CONF message
		 */
		b3cmsg = kmalloc(sizeof(*b3cmsg), GFP_KERNEL);
		if (!b3cmsg) {
			dev_err(cs->dev, "%s: out of memory\n", __func__);
			send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
			return;
		}
		capi_cmsg_header(b3cmsg, ap->id, CAPI_DISCONNECT_B3, CAPI_IND,
				 ap->nextMessageNumber++,
				 cmsg->adr.adrPLCI | (1 << 16));
		b3cmsg->Reason_B3 = CapiProtocolErrorLayer1;
		b3skb = alloc_skb(CAPI_DISCONNECT_B3_IND_BASELEN, GFP_KERNEL);
		if (b3skb == NULL) {
			dev_err(cs->dev, "%s: out of memory\n", __func__);
			send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
			return;
		}
		capi_cmsg2message(b3cmsg,
			__skb_put(b3skb, CAPI_DISCONNECT_B3_IND_BASELEN));
		kfree(b3cmsg);
		capi_ctr_handle_message(&iif->ctr, ap->id, b3skb);
	}

	/* trigger hangup, causing eventual DISCONNECT_IND */
	if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
		return;
	}
	gigaset_schedule_event(cs);

	/* emit reply */
	send_conf(iif, ap, skb, CapiSuccess);
}

/*
 * process DISCONNECT_B3_REQ message
 * schedule EV_HUP and emit DISCONNECT_B3_CONF reply
 */
static void do_disconnect_b3_req(struct gigaset_capi_ctr *iif,
				 struct gigaset_capi_appl *ap,
				 struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	_cmsg *cmsg = &iif->acmsg;
	int channel;

	/* decode message */
	capi_message2cmsg(cmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, cmsg);

	/* extract and check channel number and NCCI */
	channel = (cmsg->adr.adrNCCI >> 8) & 0xff;
	if (!channel || channel > cs->channels ||
	    ((cmsg->adr.adrNCCI >> 16) & 0xffff) != 1) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "DISCONNECT_B3_REQ", "NCCI", cmsg->adr.adrNCCI);
		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
		return;
	}

	/* reject if logical connection not active */
	if (ap->connected < APCONN_ACTIVE) {
		send_conf(iif, ap, skb,
			  CapiMessageNotSupportedInCurrentState);
		return;
	}

	/* trigger hangup, causing eventual DISCONNECT_B3_IND */
	if (!gigaset_add_event(cs, &cs->bcs[channel-1].at_state,
			       EV_HUP, NULL, 0, NULL)) {
		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
		return;
	}
	gigaset_schedule_event(cs);

	/* NCPI parameter: not applicable for B3 Transparent */
	ignore_cstruct_param(cs, cmsg->NCPI,
				"DISCONNECT_B3_REQ", "NCPI");
	send_conf(iif, ap, skb, (cmsg->NCPI && cmsg->NCPI[0]) ?
				CapiNcpiNotSupportedByProtocol : CapiSuccess);
}

/*
 * process DATA_B3_REQ message
 */
static void do_data_b3_req(struct gigaset_capi_ctr *iif,
			   struct gigaset_capi_appl *ap,
			   struct sk_buff *skb)
{
	struct cardstate *cs = iif->ctr.driverdata;
	int channel = CAPIMSG_PLCI_PART(skb->data);
	u16 ncci = CAPIMSG_NCCI_PART(skb->data);
	u16 msglen = CAPIMSG_LEN(skb->data);
	u16 datalen = CAPIMSG_DATALEN(skb->data);
	u16 flags = CAPIMSG_FLAGS(skb->data);

	/* frequent message, avoid _cmsg overhead */
	dump_rawmsg(DEBUG_LLDATA, "DATA_B3_REQ", skb->data);

	gig_dbg(DEBUG_LLDATA,
		"Receiving data from LL (ch: %d, flg: %x, sz: %d|%d)",
		channel, flags, msglen, datalen);

	/* check parameters */
	if (channel == 0 || channel > cs->channels || ncci != 1) {
		dev_notice(cs->dev, "%s: invalid %s 0x%02x\n",
			   "DATA_B3_REQ", "NCCI", CAPIMSG_NCCI(skb->data));
		send_conf(iif, ap, skb, CapiIllContrPlciNcci);
		return;
	}
	if (msglen != CAPI_DATA_B3_REQ_LEN && msglen != CAPI_DATA_B3_REQ_LEN64)
		dev_notice(cs->dev, "%s: unexpected length %d\n",
			   "DATA_B3_REQ", msglen);
	if (msglen + datalen != skb->len)
		dev_notice(cs->dev, "%s: length mismatch (%d+%d!=%d)\n",
			   "DATA_B3_REQ", msglen, datalen, skb->len);
	if (msglen + datalen > skb->len) {
		/* message too short for announced data length */
		send_conf(iif, ap, skb, CapiIllMessageParmCoding); /* ? */
		return;
	}
	if (flags & CAPI_FLAGS_RESERVED) {
		dev_notice(cs->dev, "%s: reserved flags set (%x)\n",
			   "DATA_B3_REQ", flags);
		send_conf(iif, ap, skb, CapiIllMessageParmCoding);
		return;
	}

	/* reject if logical connection not active */
	if (ap->connected < APCONN_ACTIVE) {
		send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
		return;
	}

	/* pull CAPI message into link layer header */
	skb_reset_mac_header(skb);
	skb->mac_len = msglen;
	skb_pull(skb, msglen);

	/* pass to device-specific module */
	if (cs->ops->send_skb(&cs->bcs[channel-1], skb) < 0) {
		send_conf(iif, ap, skb, CAPI_MSGOSRESOURCEERR);
		return;
	}

	/* DATA_B3_CONF reply will be sent by gigaset_skb_sent() */

	/*
	 * ToDo: honor unset "delivery confirmation" bit
	 * (send DATA_B3_CONF immediately?)
	 */
}

/*
 * process RESET_B3_REQ message
 * just always reply "not supported by current protocol"
 */
static void do_reset_b3_req(struct gigaset_capi_ctr *iif,
			    struct gigaset_capi_appl *ap,
			    struct sk_buff *skb)
{
	/* decode message */
	capi_message2cmsg(&iif->acmsg, skb->data);
	dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
	send_conf(iif, ap, skb,
		  CapiResetProcedureNotSupportedByCurrentProtocol);
}

/*
 * dump unsupported/ignored messages at most twice per minute,
 * some apps send those very frequently
 */
static unsigned long ignored_msg_dump_time;

/*
 * unsupported CAPI message handler
 */
static void do_unsupported(struct gigaset_capi_ctr *iif,
			   struct gigaset_capi_appl *ap,
			   struct sk_buff *skb)
{
	/* decode message */
	capi_message2cmsg(&iif->acmsg, skb->data);
	if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000))
		dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
	send_conf(iif, ap, skb, CapiMessageNotSupportedInCurrentState);
}

/*
 * CAPI message handler: no-op
 */
static void do_nothing(struct gigaset_capi_ctr *iif,
		       struct gigaset_capi_appl *ap,
		       struct sk_buff *skb)
{
	if (printk_timed_ratelimit(&ignored_msg_dump_time, 30 * 1000)) {
		/* decode message */
		capi_message2cmsg(&iif->acmsg, skb->data);
		dump_cmsg(DEBUG_CMD, __func__, &iif->acmsg);
	}
	dev_kfree_skb_any(skb);
}

static void do_data_b3_resp(struct gigaset_capi_ctr *iif,
			    struct gigaset_capi_appl *ap,
			    struct sk_buff *skb)
{
	dump_rawmsg(DEBUG_LLDATA, __func__, skb->data);
	dev_kfree_skb_any(skb);
}

/* table of outgoing CAPI message handlers with lookup function */
typedef void (*capi_send_handler_t)(struct gigaset_capi_ctr *,
				    struct gigaset_capi_appl *,
				    struct sk_buff *);

static struct {
	u16 cmd;
	capi_send_handler_t handler;
} capi_send_handler_table[] = {
	/* most frequent messages first for faster lookup */
	{ CAPI_DATA_B3_REQ, do_data_b3_req },
	{ CAPI_DATA_B3_RESP, do_data_b3_resp },

	{ CAPI_ALERT_REQ, do_alert_req },
	{ CAPI_CONNECT_ACTIVE_RESP, do_nothing },
	{ CAPI_CONNECT_B3_ACTIVE_RESP, do_nothing },
	{ CAPI_CONNECT_B3_REQ, do_connect_b3_req },
	{ CAPI_CONNECT_B3_RESP, do_connect_b3_resp },
	{ CAPI_CONNECT_B3_T90_ACTIVE_RESP, do_nothing },
	{ CAPI_CONNECT_REQ, do_connect_req },
	{ CAPI_CONNECT_RESP, do_connect_resp },
	{ CAPI_DISCONNECT_B3_REQ, do_disconnect_b3_req },
	{ CAPI_DISCONNECT_B3_RESP, do_nothing },
	{ CAPI_DISCONNECT_REQ, do_disconnect_req },
	{ CAPI_DISCONNECT_RESP, do_nothing },
	{ CAPI_FACILITY_REQ, do_facility_req },
	{ CAPI_FACILITY_RESP, do_nothing },
	{ CAPI_LISTEN_REQ, do_listen_req },
	{ CAPI_SELECT_B_PROTOCOL_REQ, do_unsupported },
	{ CAPI_RESET_B3_REQ, do_reset_b3_req },
	{ CAPI_RESET_B3_RESP, do_nothing },

	/*
	 * ToDo: support overlap sending (requires ev-layer state
	 * machine extension to generate additional ATD commands)
	 */
	{ CAPI_INFO_REQ, do_unsupported },
	{ CAPI_INFO_RESP, do_nothing },

	/*
	 * ToDo: what's the proper response for these?
	 */
	{ CAPI_MANUFACTURER_REQ, do_nothing },
	{ CAPI_MANUFACTURER_RESP, do_nothing },
};

/* look up handler */
static inline capi_send_handler_t lookup_capi_send_handler(const u16 cmd)
{
	size_t i;

	for (i = 0; i < ARRAY_SIZE(capi_send_handler_table); i++)
		if (capi_send_handler_table[i].cmd == cmd)
			return capi_send_handler_table[i].handler;
	return NULL;
}


/**
 * gigaset_send_message() - accept a CAPI message from an application
 * @ctr:	controller descriptor structure.
 * @skb:	CAPI message.
 *
 * Return value: CAPI error code
 * Note: capidrv (and probably others, too) only uses the return value to
 * decide whether it has to free the skb (only if result != CAPI_NOERROR (0))
 */
static u16 gigaset_send_message(struct capi_ctr *ctr, struct sk_buff *skb)
{
	struct gigaset_capi_ctr *iif
		= container_of(ctr, struct gigaset_capi_ctr, ctr);
	struct cardstate *cs = ctr->driverdata;
	struct gigaset_capi_appl *ap;
	capi_send_handler_t handler;

	/* can only handle linear sk_buffs */
	if (skb_linearize(skb) < 0) {
		dev_warn(cs->dev, "%s: skb_linearize failed\n", __func__);
		return CAPI_MSGOSRESOURCEERR;
	}

	/* retrieve application data structure */
	ap = get_appl(iif, CAPIMSG_APPID(skb->data));
	if (!ap) {
		dev_notice(cs->dev, "%s: application %u not registered\n",
			   __func__, CAPIMSG_APPID(skb->data));
		return CAPI_ILLAPPNR;
	}

	/* look up command */
	handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
	if (!handler) {
		/* unknown/unsupported message type */
		if (printk_ratelimit())
			dev_notice(cs->dev, "%s: unsupported message %u\n",
				   __func__, CAPIMSG_CMD(skb->data));
		return CAPI_ILLCMDORSUBCMDORMSGTOSMALL;
	}

	/* serialize */
	if (atomic_add_return(1, &iif->sendqlen) > 1) {
		/* queue behind other messages */
		skb_queue_tail(&iif->sendqueue, skb);
		return CAPI_NOERROR;
	}

	/* process message */
	handler(iif, ap, skb);

	/* process other messages arrived in the meantime */
	while (atomic_sub_return(1, &iif->sendqlen) > 0) {
		skb = skb_dequeue(&iif->sendqueue);
		if (!skb) {
			/* should never happen */
			dev_err(cs->dev, "%s: send queue empty\n", __func__);
			continue;
		}
		ap = get_appl(iif, CAPIMSG_APPID(skb->data));
		if (!ap) {
			/* could that happen? */
			dev_warn(cs->dev, "%s: application %u vanished\n",
				 __func__, CAPIMSG_APPID(skb->data));
			continue;
		}
		handler = lookup_capi_send_handler(CAPIMSG_CMD(skb->data));
		if (!handler) {
			/* should never happen */
			dev_err(cs->dev, "%s: handler %x vanished\n",
				__func__, CAPIMSG_CMD(skb->data));
			continue;
		}
		handler(iif, ap, skb);
	}

	return CAPI_NOERROR;
}

/**
 * gigaset_procinfo() - build single line description for controller
 * @ctr:	controller descriptor structure.
 *
 * Return value: pointer to generated string (null terminated)
 */
static char *gigaset_procinfo(struct capi_ctr *ctr)
{
	return ctr->name;	/* ToDo: more? */
}

static int gigaset_proc_show(struct seq_file *m, void *v)
{
	struct capi_ctr *ctr = m->private;
	struct cardstate *cs = ctr->driverdata;
	char *s;
	int i;

	seq_printf(m, "%-16s %s\n", "name", ctr->name);
	seq_printf(m, "%-16s %s %s\n", "dev",
			dev_driver_string(cs->dev), dev_name(cs->dev));
	seq_printf(m, "%-16s %d\n", "id", cs->myid);
	if (cs->gotfwver)
		seq_printf(m, "%-16s %d.%d.%d.%d\n", "firmware",
			cs->fwver[0], cs->fwver[1], cs->fwver[2], cs->fwver[3]);
	seq_printf(m, "%-16s %d\n", "channels", cs->channels);
	seq_printf(m, "%-16s %s\n", "onechannel", cs->onechannel ? "yes" : "no");

	switch (cs->mode) {
	case M_UNKNOWN:
		s = "unknown";
		break;
	case M_CONFIG:
		s = "config";
		break;
	case M_UNIMODEM:
		s = "Unimodem";
		break;
	case M_CID:
		s = "CID";
		break;
	default:
		s = "??";
	}
	seq_printf(m, "%-16s %s\n", "mode", s);

	switch (cs->mstate) {
	case MS_UNINITIALIZED:
		s = "uninitialized";
		break;
	case MS_INIT:
		s = "init";
		break;
	case MS_LOCKED:
		s = "locked";
		break;
	case MS_SHUTDOWN:
		s = "shutdown";
		break;
	case MS_RECOVER:
		s = "recover";
		break;
	case MS_READY:
		s = "ready";
		break;
	default:
		s = "??";
	}
	seq_printf(m, "%-16s %s\n", "mstate", s);

	seq_printf(m, "%-16s %s\n", "running", cs->running ? "yes" : "no");
	seq_printf(m, "%-16s %s\n", "connected", cs->connected ? "yes" : "no");
	seq_printf(m, "%-16s %s\n", "isdn_up", cs->isdn_up ? "yes" : "no");
	seq_printf(m, "%-16s %s\n", "cidmode", cs->cidmode ? "yes" : "no");

	for (i = 0; i < cs->channels; i++) {
		seq_printf(m, "[%d]%-13s %d\n", i, "corrupted",
				cs->bcs[i].corrupted);
		seq_printf(m, "[%d]%-13s %d\n", i, "trans_down",
				cs->bcs[i].trans_down);
		seq_printf(m, "[%d]%-13s %d\n", i, "trans_up",
				cs->bcs[i].trans_up);
		seq_printf(m, "[%d]%-13s %d\n", i, "chstate",
				cs->bcs[i].chstate);
		switch (cs->bcs[i].proto2) {
		case L2_BITSYNC:
			s = "bitsync";
			break;
		case L2_HDLC:
			s = "HDLC";
			break;
		case L2_VOICE:
			s = "voice";
			break;
		default:
			s = "??";
		}
		seq_printf(m, "[%d]%-13s %s\n", i, "proto2", s);
	}
	return 0;
}

static int gigaset_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, gigaset_proc_show, PDE(inode)->data);
}

static const struct file_operations gigaset_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= gigaset_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct capi_driver capi_driver_gigaset = {
	.name		= "gigaset",
	.revision	= "1.0",
};

/**
 * gigaset_isdn_register() - register to LL
 * @cs:		device descriptor structure.
 * @isdnid:	device name.
 *
 * Called by main module to register the device with the LL.
 *
 * Return value: 1 for success, 0 for failure
 */
int gigaset_isdn_register(struct cardstate *cs, const char *isdnid)
{
	struct gigaset_capi_ctr *iif;
	int rc;

	pr_info("Kernel CAPI interface\n");

	iif = kmalloc(sizeof(*iif), GFP_KERNEL);
	if (!iif) {
		pr_err("%s: out of memory\n", __func__);
		return 0;
	}

	/* register driver with CAPI (ToDo: what for?) */
	register_capi_driver(&capi_driver_gigaset);

	/* prepare controller structure */
	iif->ctr.owner         = THIS_MODULE;
	iif->ctr.driverdata    = cs;
	strncpy(iif->ctr.name, isdnid, sizeof(iif->ctr.name));
	iif->ctr.driver_name   = "gigaset";
	iif->ctr.load_firmware = gigaset_load_firmware;
	iif->ctr.reset_ctr     = gigaset_reset_ctr;
	iif->ctr.register_appl = gigaset_register_appl;
	iif->ctr.release_appl  = gigaset_release_appl;
	iif->ctr.send_message  = gigaset_send_message;
	iif->ctr.procinfo      = gigaset_procinfo;
	iif->ctr.proc_fops = &gigaset_proc_fops;
	INIT_LIST_HEAD(&iif->appls);
	skb_queue_head_init(&iif->sendqueue);
	atomic_set(&iif->sendqlen, 0);

	/* register controller with CAPI */
	rc = attach_capi_ctr(&iif->ctr);
	if (rc) {
		pr_err("attach_capi_ctr failed (%d)\n", rc);
		unregister_capi_driver(&capi_driver_gigaset);
		kfree(iif);
		return 0;
	}

	cs->iif = iif;
	cs->hw_hdr_len = CAPI_DATA_B3_REQ_LEN;
	return 1;
}

/**
 * gigaset_isdn_unregister() - unregister from LL
 * @cs:		device descriptor structure.
 *
 * Called by main module to unregister the device from the LL.
 */
void gigaset_isdn_unregister(struct cardstate *cs)
{
	struct gigaset_capi_ctr *iif = cs->iif;

	detach_capi_ctr(&iif->ctr);
	kfree(iif);
	cs->iif = NULL;
	unregister_capi_driver(&capi_driver_gigaset);
}