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
|
/*
* f_ncm.c -- USB CDC Network (NCM) link function driver
*
* Copyright (C) 2010 Nokia Corporation
* Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
*
* The driver borrows from f_ecm.c which is:
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <linux/usb/cdc.h>
#include "u_ether.h"
/*
* This function is a "CDC Network Control Model" (CDC NCM) Ethernet link.
* NCM is intended to be used with high-speed network attachments.
*
* Note that NCM requires the use of "alternate settings" for its data
* interface. This means that the set_alt() method has real work to do,
* and also means that a get_alt() method is required.
*/
/* to trigger crc/non-crc ndp signature */
#define NCM_NDP_HDR_CRC_MASK 0x01000000
#define NCM_NDP_HDR_CRC 0x01000000
#define NCM_NDP_HDR_NOCRC 0x00000000
enum ncm_notify_state {
NCM_NOTIFY_NONE, /* don't notify */
NCM_NOTIFY_CONNECT, /* issue CONNECT next */
NCM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
};
struct f_ncm {
struct gether port;
u8 ctrl_id, data_id;
char ethaddr[14];
struct usb_ep *notify;
struct usb_request *notify_req;
u8 notify_state;
bool is_open;
struct ndp_parser_opts *parser_opts;
bool is_crc;
/*
* for notification, it is accessed from both
* callback and ethernet open/close
*/
spinlock_t lock;
};
static inline struct f_ncm *func_to_ncm(struct usb_function *f)
{
return container_of(f, struct f_ncm, port.func);
}
/* peak (theoretical) bulk transfer rate in bits-per-second */
static inline unsigned ncm_bitrate(struct usb_gadget *g)
{
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return 13 * 512 * 8 * 1000 * 8;
else
return 19 * 64 * 1 * 1000 * 8;
}
/*-------------------------------------------------------------------------*/
/*
* We cannot group frames so use just the minimal size which ok to put
* one max-size ethernet frame.
* If the host can group frames, allow it to do that, 16K is selected,
* because it's used by default by the current linux host driver
*/
#define NTB_DEFAULT_IN_SIZE USB_CDC_NCM_NTB_MIN_IN_SIZE
#define NTB_OUT_SIZE 16384
/*
* skbs of size less than that will not be aligned
* to NCM's dwNtbInMaxSize to save bus bandwidth
*/
#define MAX_TX_NONFIXED (512 * 3)
#define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \
USB_CDC_NCM_NTB32_SUPPORTED)
static struct usb_cdc_ncm_ntb_parameters ntb_parameters = {
.wLength = cpu_to_le16(sizeof(ntb_parameters)),
.bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED),
.dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE),
.wNdpInDivisor = cpu_to_le16(4),
.wNdpInPayloadRemainder = cpu_to_le16(0),
.wNdpInAlignment = cpu_to_le16(4),
.dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE),
.wNdpOutDivisor = cpu_to_le16(4),
.wNdpOutPayloadRemainder = cpu_to_le16(0),
.wNdpOutAlignment = cpu_to_le16(4),
};
/*
* Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
* packet, to simplify cancellation; and a big transfer interval, to
* waste less bandwidth.
*/
#define NCM_STATUS_INTERVAL_MS 32
#define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
static struct usb_interface_assoc_descriptor ncm_iad_desc __initdata = {
.bLength = sizeof ncm_iad_desc,
.bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
/* .bFirstInterface = DYNAMIC, */
.bInterfaceCount = 2, /* control + data */
.bFunctionClass = USB_CLASS_COMM,
.bFunctionSubClass = USB_CDC_SUBCLASS_NCM,
.bFunctionProtocol = USB_CDC_PROTO_NONE,
/* .iFunction = DYNAMIC */
};
/* interface descriptor: */
static struct usb_interface_descriptor ncm_control_intf __initdata = {
.bLength = sizeof ncm_control_intf,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
.bInterfaceProtocol = USB_CDC_PROTO_NONE,
/* .iInterface = DYNAMIC */
};
static struct usb_cdc_header_desc ncm_header_desc __initdata = {
.bLength = sizeof ncm_header_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = cpu_to_le16(0x0110),
};
static struct usb_cdc_union_desc ncm_union_desc __initdata = {
.bLength = sizeof(ncm_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
/* .bMasterInterface0 = DYNAMIC */
/* .bSlaveInterface0 = DYNAMIC */
};
static struct usb_cdc_ether_desc ecm_desc __initdata = {
.bLength = sizeof ecm_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
/* this descriptor actually adds value, surprise! */
/* .iMACAddress = DYNAMIC */
.bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
.wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
.wNumberMCFilters = cpu_to_le16(0),
.bNumberPowerFilters = 0,
};
#define NCAPS (USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE)
static struct usb_cdc_ncm_desc ncm_desc __initdata = {
.bLength = sizeof ncm_desc,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_NCM_TYPE,
.bcdNcmVersion = cpu_to_le16(0x0100),
/* can process SetEthernetPacketFilter */
.bmNetworkCapabilities = NCAPS,
};
/* the default data interface has no endpoints ... */
static struct usb_interface_descriptor ncm_data_nop_intf __initdata = {
.bLength = sizeof ncm_data_nop_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
/* .iInterface = DYNAMIC */
};
/* ... but the "real" data interface has two bulk endpoints */
static struct usb_interface_descriptor ncm_data_intf __initdata = {
.bLength = sizeof ncm_data_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 1,
.bAlternateSetting = 1,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor fs_ncm_notify_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
.bInterval = NCM_STATUS_INTERVAL_MS,
};
static struct usb_endpoint_descriptor fs_ncm_in_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor fs_ncm_out_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *ncm_fs_function[] __initdata = {
(struct usb_descriptor_header *) &ncm_iad_desc,
/* CDC NCM control descriptors */
(struct usb_descriptor_header *) &ncm_control_intf,
(struct usb_descriptor_header *) &ncm_header_desc,
(struct usb_descriptor_header *) &ncm_union_desc,
(struct usb_descriptor_header *) &ecm_desc,
(struct usb_descriptor_header *) &ncm_desc,
(struct usb_descriptor_header *) &fs_ncm_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ncm_data_nop_intf,
(struct usb_descriptor_header *) &ncm_data_intf,
(struct usb_descriptor_header *) &fs_ncm_in_desc,
(struct usb_descriptor_header *) &fs_ncm_out_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor hs_ncm_notify_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
.bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS),
};
static struct usb_endpoint_descriptor hs_ncm_in_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_ncm_out_desc __initdata = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *ncm_hs_function[] __initdata = {
(struct usb_descriptor_header *) &ncm_iad_desc,
/* CDC NCM control descriptors */
(struct usb_descriptor_header *) &ncm_control_intf,
(struct usb_descriptor_header *) &ncm_header_desc,
(struct usb_descriptor_header *) &ncm_union_desc,
(struct usb_descriptor_header *) &ecm_desc,
(struct usb_descriptor_header *) &ncm_desc,
(struct usb_descriptor_header *) &hs_ncm_notify_desc,
/* data interface, altsettings 0 and 1 */
(struct usb_descriptor_header *) &ncm_data_nop_intf,
(struct usb_descriptor_header *) &ncm_data_intf,
(struct usb_descriptor_header *) &hs_ncm_in_desc,
(struct usb_descriptor_header *) &hs_ncm_out_desc,
NULL,
};
/* string descriptors: */
#define STRING_CTRL_IDX 0
#define STRING_MAC_IDX 1
#define STRING_DATA_IDX 2
#define STRING_IAD_IDX 3
static struct usb_string ncm_string_defs[] = {
[STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)",
[STRING_MAC_IDX].s = "",
[STRING_DATA_IDX].s = "CDC Network Data",
[STRING_IAD_IDX].s = "CDC NCM",
{ } /* end of list */
};
static struct usb_gadget_strings ncm_string_table = {
.language = 0x0409, /* en-us */
.strings = ncm_string_defs,
};
static struct usb_gadget_strings *ncm_strings[] = {
&ncm_string_table,
NULL,
};
/*
* Here are options for NCM Datagram Pointer table (NDP) parser.
* There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3),
* in NDP16 offsets and sizes fields are 1 16bit word wide,
* in NDP32 -- 2 16bit words wide. Also signatures are different.
* To make the parser code the same, put the differences in the structure,
* and switch pointers to the structures when the format is changed.
*/
struct ndp_parser_opts {
u32 nth_sign;
u32 ndp_sign;
unsigned nth_size;
unsigned ndp_size;
unsigned ndplen_align;
/* sizes in u16 units */
unsigned dgram_item_len; /* index or length */
unsigned block_length;
unsigned fp_index;
unsigned reserved1;
unsigned reserved2;
unsigned next_fp_index;
};
#define INIT_NDP16_OPTS { \
.nth_sign = USB_CDC_NCM_NTH16_SIGN, \
.ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN, \
.nth_size = sizeof(struct usb_cdc_ncm_nth16), \
.ndp_size = sizeof(struct usb_cdc_ncm_ndp16), \
.ndplen_align = 4, \
.dgram_item_len = 1, \
.block_length = 1, \
.fp_index = 1, \
.reserved1 = 0, \
.reserved2 = 0, \
.next_fp_index = 1, \
}
#define INIT_NDP32_OPTS { \
.nth_sign = USB_CDC_NCM_NTH32_SIGN, \
.ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN, \
.nth_size = sizeof(struct usb_cdc_ncm_nth32), \
.ndp_size = sizeof(struct usb_cdc_ncm_ndp32), \
.ndplen_align = 8, \
.dgram_item_len = 2, \
.block_length = 2, \
.fp_index = 2, \
.reserved1 = 1, \
.reserved2 = 2, \
.next_fp_index = 2, \
}
static struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
static struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
static inline void put_ncm(__le16 **p, unsigned size, unsigned val)
{
switch (size) {
case 1:
put_unaligned_le16((u16)val, *p);
break;
case 2:
put_unaligned_le32((u32)val, *p);
break;
default:
BUG();
}
*p += size;
}
static inline unsigned get_ncm(__le16 **p, unsigned size)
{
unsigned tmp;
switch (size) {
case 1:
tmp = get_unaligned_le16(*p);
break;
case 2:
tmp = get_unaligned_le32(*p);
break;
default:
BUG();
}
*p += size;
return tmp;
}
/*-------------------------------------------------------------------------*/
static inline void ncm_reset_values(struct f_ncm *ncm)
{
ncm->parser_opts = &ndp16_opts;
ncm->is_crc = false;
ncm->port.cdc_filter = DEFAULT_FILTER;
/* doesn't make sense for ncm, fixed size used */
ncm->port.header_len = 0;
ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE;
}
/*
* Context: ncm->lock held
*/
static void ncm_do_notify(struct f_ncm *ncm)
{
struct usb_request *req = ncm->notify_req;
struct usb_cdc_notification *event;
struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
__le32 *data;
int status;
/* notification already in flight? */
if (!req)
return;
event = req->buf;
switch (ncm->notify_state) {
case NCM_NOTIFY_NONE:
return;
case NCM_NOTIFY_CONNECT:
event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
if (ncm->is_open)
event->wValue = cpu_to_le16(1);
else
event->wValue = cpu_to_le16(0);
event->wLength = 0;
req->length = sizeof *event;
DBG(cdev, "notify connect %s\n",
ncm->is_open ? "true" : "false");
ncm->notify_state = NCM_NOTIFY_NONE;
break;
case NCM_NOTIFY_SPEED:
event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
event->wValue = cpu_to_le16(0);
event->wLength = cpu_to_le16(8);
req->length = NCM_STATUS_BYTECOUNT;
/* SPEED_CHANGE data is up/down speeds in bits/sec */
data = req->buf + sizeof *event;
data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));
data[1] = data[0];
DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget));
ncm->notify_state = NCM_NOTIFY_CONNECT;
break;
}
event->bmRequestType = 0xA1;
event->wIndex = cpu_to_le16(ncm->ctrl_id);
ncm->notify_req = NULL;
/*
* In double buffering if there is a space in FIFO,
* completion callback can be called right after the call,
* so unlocking
*/
spin_unlock(&ncm->lock);
status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC);
spin_lock(&ncm->lock);
if (status < 0) {
ncm->notify_req = req;
DBG(cdev, "notify --> %d\n", status);
}
}
/*
* Context: ncm->lock held
*/
static void ncm_notify(struct f_ncm *ncm)
{
/*
* NOTE on most versions of Linux, host side cdc-ethernet
* won't listen for notifications until its netdevice opens.
* The first notification then sits in the FIFO for a long
* time, and the second one is queued.
*
* If ncm_notify() is called before the second (CONNECT)
* notification is sent, then it will reset to send the SPEED
* notificaion again (and again, and again), but it's not a problem
*/
ncm->notify_state = NCM_NOTIFY_SPEED;
ncm_do_notify(ncm);
}
static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_ncm *ncm = req->context;
struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
struct usb_cdc_notification *event = req->buf;
spin_lock(&ncm->lock);
switch (req->status) {
case 0:
VDBG(cdev, "Notification %02x sent\n",
event->bNotificationType);
break;
case -ECONNRESET:
case -ESHUTDOWN:
ncm->notify_state = NCM_NOTIFY_NONE;
break;
default:
DBG(cdev, "event %02x --> %d\n",
event->bNotificationType, req->status);
break;
}
ncm->notify_req = req;
ncm_do_notify(ncm);
spin_unlock(&ncm->lock);
}
static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req)
{
/* now for SET_NTB_INPUT_SIZE only */
unsigned in_size;
struct usb_function *f = req->context;
struct f_ncm *ncm = func_to_ncm(f);
struct usb_composite_dev *cdev = ep->driver_data;
req->context = NULL;
if (req->status || req->actual != req->length) {
DBG(cdev, "Bad control-OUT transfer\n");
goto invalid;
}
in_size = get_unaligned_le32(req->buf);
if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE ||
in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) {
DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size);
goto invalid;
}
ncm->port.fixed_in_len = in_size;
VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size);
return;
invalid:
usb_ep_set_halt(ep);
return;
}
static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
struct f_ncm *ncm = func_to_ncm(f);
struct usb_composite_dev *cdev = f->config->cdev;
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
/*
* composite driver infrastructure handles everything except
* CDC class messages; interface activation uses set_alt().
*/
switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_ETHERNET_PACKET_FILTER:
/*
* see 6.2.30: no data, wIndex = interface,
* wValue = packet filter bitmap
*/
if (w_length != 0 || w_index != ncm->ctrl_id)
goto invalid;
DBG(cdev, "packet filter %02x\n", w_value);
/*
* REVISIT locking of cdc_filter. This assumes the UDC
* driver won't have a concurrent packet TX irq running on
* another CPU; or that if it does, this write is atomic...
*/
ncm->port.cdc_filter = w_value;
value = 0;
break;
/*
* and optionally:
* case USB_CDC_SEND_ENCAPSULATED_COMMAND:
* case USB_CDC_GET_ENCAPSULATED_RESPONSE:
* case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
* case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
* case USB_CDC_GET_ETHERNET_STATISTIC:
*/
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_GET_NTB_PARAMETERS:
if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id)
goto invalid;
value = w_length > sizeof ntb_parameters ?
sizeof ntb_parameters : w_length;
memcpy(req->buf, &ntb_parameters, value);
VDBG(cdev, "Host asked NTB parameters\n");
break;
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_GET_NTB_INPUT_SIZE:
if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id)
goto invalid;
put_unaligned_le32(ncm->port.fixed_in_len, req->buf);
value = 4;
VDBG(cdev, "Host asked INPUT SIZE, sending %d\n",
ncm->port.fixed_in_len);
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_NTB_INPUT_SIZE:
{
if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id)
goto invalid;
req->complete = ncm_ep0out_complete;
req->length = w_length;
req->context = f;
value = req->length;
break;
}
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_GET_NTB_FORMAT:
{
uint16_t format;
if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
goto invalid;
format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001;
put_unaligned_le16(format, req->buf);
value = 2;
VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format);
break;
}
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_NTB_FORMAT:
{
if (w_length != 0 || w_index != ncm->ctrl_id)
goto invalid;
switch (w_value) {
case 0x0000:
ncm->parser_opts = &ndp16_opts;
DBG(cdev, "NCM16 selected\n");
break;
case 0x0001:
ncm->parser_opts = &ndp32_opts;
DBG(cdev, "NCM32 selected\n");
break;
default:
goto invalid;
}
value = 0;
break;
}
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_GET_CRC_MODE:
{
uint16_t is_crc;
if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
goto invalid;
is_crc = ncm->is_crc ? 0x0001 : 0x0000;
put_unaligned_le16(is_crc, req->buf);
value = 2;
VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc);
break;
}
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_CRC_MODE:
{
int ndp_hdr_crc = 0;
if (w_length != 0 || w_index != ncm->ctrl_id)
goto invalid;
switch (w_value) {
case 0x0000:
ncm->is_crc = false;
ndp_hdr_crc = NCM_NDP_HDR_NOCRC;
DBG(cdev, "non-CRC mode selected\n");
break;
case 0x0001:
ncm->is_crc = true;
ndp_hdr_crc = NCM_NDP_HDR_CRC;
DBG(cdev, "CRC mode selected\n");
break;
default:
goto invalid;
}
ncm->parser_opts->ndp_sign &= ~NCM_NDP_HDR_CRC_MASK;
ncm->parser_opts->ndp_sign |= ndp_hdr_crc;
value = 0;
break;
}
/* and disabled in ncm descriptor: */
/* case USB_CDC_GET_NET_ADDRESS: */
/* case USB_CDC_SET_NET_ADDRESS: */
/* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */
/* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */
default:
invalid:
DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
/* respond with data transfer or status phase? */
if (value >= 0) {
DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->zero = 0;
req->length = value;
value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
ERROR(cdev, "ncm req %02x.%02x response err %d\n",
ctrl->bRequestType, ctrl->bRequest,
value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_ncm *ncm = func_to_ncm(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* Control interface has only altsetting 0 */
if (intf == ncm->ctrl_id) {
if (alt != 0)
goto fail;
if (ncm->notify->driver_data) {
DBG(cdev, "reset ncm control %d\n", intf);
usb_ep_disable(ncm->notify);
}
if (!(ncm->notify->desc)) {
DBG(cdev, "init ncm ctrl %d\n", intf);
if (config_ep_by_speed(cdev->gadget, f, ncm->notify))
goto fail;
}
usb_ep_enable(ncm->notify);
ncm->notify->driver_data = ncm;
/* Data interface has two altsettings, 0 and 1 */
} else if (intf == ncm->data_id) {
if (alt > 1)
goto fail;
if (ncm->port.in_ep->driver_data) {
DBG(cdev, "reset ncm\n");
gether_disconnect(&ncm->port);
ncm_reset_values(ncm);
}
/*
* CDC Network only sends data in non-default altsettings.
* Changing altsettings resets filters, statistics, etc.
*/
if (alt == 1) {
struct net_device *net;
if (!ncm->port.in_ep->desc ||
!ncm->port.out_ep->desc) {
DBG(cdev, "init ncm\n");
if (config_ep_by_speed(cdev->gadget, f,
ncm->port.in_ep) ||
config_ep_by_speed(cdev->gadget, f,
ncm->port.out_ep)) {
ncm->port.in_ep->desc = NULL;
ncm->port.out_ep->desc = NULL;
goto fail;
}
}
/* TODO */
/* Enable zlps by default for NCM conformance;
* override for musb_hdrc (avoids txdma ovhead)
*/
ncm->port.is_zlp_ok = !(
gadget_is_musbhdrc(cdev->gadget)
);
ncm->port.cdc_filter = DEFAULT_FILTER;
DBG(cdev, "activate ncm\n");
net = gether_connect(&ncm->port);
if (IS_ERR(net))
return PTR_ERR(net);
}
spin_lock(&ncm->lock);
ncm_notify(ncm);
spin_unlock(&ncm->lock);
} else
goto fail;
return 0;
fail:
return -EINVAL;
}
/*
* Because the data interface supports multiple altsettings,
* this NCM function *MUST* implement a get_alt() method.
*/
static int ncm_get_alt(struct usb_function *f, unsigned intf)
{
struct f_ncm *ncm = func_to_ncm(f);
if (intf == ncm->ctrl_id)
return 0;
return ncm->port.in_ep->driver_data ? 1 : 0;
}
static struct sk_buff *ncm_wrap_ntb(struct gether *port,
struct sk_buff *skb)
{
struct f_ncm *ncm = func_to_ncm(&port->func);
struct sk_buff *skb2;
int ncb_len = 0;
__le16 *tmp;
int div;
int rem;
int pad;
int ndp_align;
int ndp_pad;
unsigned max_size = ncm->port.fixed_in_len;
struct ndp_parser_opts *opts = ncm->parser_opts;
unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
div = le16_to_cpu(ntb_parameters.wNdpInDivisor);
rem = le16_to_cpu(ntb_parameters.wNdpInPayloadRemainder);
ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment);
ncb_len += opts->nth_size;
ndp_pad = ALIGN(ncb_len, ndp_align) - ncb_len;
ncb_len += ndp_pad;
ncb_len += opts->ndp_size;
ncb_len += 2 * 2 * opts->dgram_item_len; /* Datagram entry */
ncb_len += 2 * 2 * opts->dgram_item_len; /* Zero datagram entry */
pad = ALIGN(ncb_len, div) + rem - ncb_len;
ncb_len += pad;
if (ncb_len + skb->len + crc_len > max_size) {
dev_kfree_skb_any(skb);
return NULL;
}
skb2 = skb_copy_expand(skb, ncb_len,
max_size - skb->len - ncb_len - crc_len,
GFP_ATOMIC);
dev_kfree_skb_any(skb);
if (!skb2)
return NULL;
skb = skb2;
tmp = (void *) skb_push(skb, ncb_len);
memset(tmp, 0, ncb_len);
put_unaligned_le32(opts->nth_sign, tmp); /* dwSignature */
tmp += 2;
/* wHeaderLength */
put_unaligned_le16(opts->nth_size, tmp++);
tmp++; /* skip wSequence */
put_ncm(&tmp, opts->block_length, skb->len); /* (d)wBlockLength */
/* (d)wFpIndex */
/* the first pointer is right after the NTH + align */
put_ncm(&tmp, opts->fp_index, opts->nth_size + ndp_pad);
tmp = (void *)tmp + ndp_pad;
/* NDP */
put_unaligned_le32(opts->ndp_sign, tmp); /* dwSignature */
tmp += 2;
/* wLength */
put_unaligned_le16(ncb_len - opts->nth_size - pad, tmp++);
tmp += opts->reserved1;
tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
tmp += opts->reserved2;
if (ncm->is_crc) {
uint32_t crc;
crc = ~crc32_le(~0,
skb->data + ncb_len,
skb->len - ncb_len);
put_unaligned_le32(crc, skb->data + skb->len);
skb_put(skb, crc_len);
}
/* (d)wDatagramIndex[0] */
put_ncm(&tmp, opts->dgram_item_len, ncb_len);
/* (d)wDatagramLength[0] */
put_ncm(&tmp, opts->dgram_item_len, skb->len - ncb_len);
/* (d)wDatagramIndex[1] and (d)wDatagramLength[1] already zeroed */
if (skb->len > MAX_TX_NONFIXED)
memset(skb_put(skb, max_size - skb->len),
0, max_size - skb->len);
return skb;
}
static int ncm_unwrap_ntb(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list)
{
struct f_ncm *ncm = func_to_ncm(&port->func);
__le16 *tmp = (void *) skb->data;
unsigned index, index2;
unsigned dg_len, dg_len2;
unsigned ndp_len;
struct sk_buff *skb2;
int ret = -EINVAL;
unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
struct ndp_parser_opts *opts = ncm->parser_opts;
unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
int dgram_counter;
/* dwSignature */
if (get_unaligned_le32(tmp) != opts->nth_sign) {
INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n",
skb->len);
print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1,
skb->data, 32, false);
goto err;
}
tmp += 2;
/* wHeaderLength */
if (get_unaligned_le16(tmp++) != opts->nth_size) {
INFO(port->func.config->cdev, "Wrong NTB headersize\n");
goto err;
}
tmp++; /* skip wSequence */
/* (d)wBlockLength */
if (get_ncm(&tmp, opts->block_length) > max_size) {
INFO(port->func.config->cdev, "OUT size exceeded\n");
goto err;
}
index = get_ncm(&tmp, opts->fp_index);
/* NCM 3.2 */
if (((index % 4) != 0) && (index < opts->nth_size)) {
INFO(port->func.config->cdev, "Bad index: %x\n",
index);
goto err;
}
/* walk through NDP */
tmp = ((void *)skb->data) + index;
if (get_unaligned_le32(tmp) != opts->ndp_sign) {
INFO(port->func.config->cdev, "Wrong NDP SIGN\n");
goto err;
}
tmp += 2;
ndp_len = get_unaligned_le16(tmp++);
/*
* NCM 3.3.1
* entry is 2 items
* item size is 16/32 bits, opts->dgram_item_len * 2 bytes
* minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry
*/
if ((ndp_len < opts->ndp_size + 2 * 2 * (opts->dgram_item_len * 2))
|| (ndp_len % opts->ndplen_align != 0)) {
INFO(port->func.config->cdev, "Bad NDP length: %x\n", ndp_len);
goto err;
}
tmp += opts->reserved1;
tmp += opts->next_fp_index; /* skip reserved (d)wNextFpIndex */
tmp += opts->reserved2;
ndp_len -= opts->ndp_size;
index2 = get_ncm(&tmp, opts->dgram_item_len);
dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
dgram_counter = 0;
do {
index = index2;
dg_len = dg_len2;
if (dg_len < 14 + crc_len) { /* ethernet header + crc */
INFO(port->func.config->cdev, "Bad dgram length: %x\n",
dg_len);
goto err;
}
if (ncm->is_crc) {
uint32_t crc, crc2;
crc = get_unaligned_le32(skb->data +
index + dg_len - crc_len);
crc2 = ~crc32_le(~0,
skb->data + index,
dg_len - crc_len);
if (crc != crc2) {
INFO(port->func.config->cdev, "Bad CRC\n");
goto err;
}
}
index2 = get_ncm(&tmp, opts->dgram_item_len);
dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
if (index2 == 0 || dg_len2 == 0) {
skb2 = skb;
} else {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
goto err;
}
if (!skb_pull(skb2, index)) {
ret = -EOVERFLOW;
goto err;
}
skb_trim(skb2, dg_len - crc_len);
skb_queue_tail(list, skb2);
ndp_len -= 2 * (opts->dgram_item_len * 2);
dgram_counter++;
if (index2 == 0 || dg_len2 == 0)
break;
} while (ndp_len > 2 * (opts->dgram_item_len * 2)); /* zero entry */
VDBG(port->func.config->cdev,
"Parsed NTB with %d frames\n", dgram_counter);
return 0;
err:
skb_queue_purge(list);
dev_kfree_skb_any(skb);
return ret;
}
static void ncm_disable(struct usb_function *f)
{
struct f_ncm *ncm = func_to_ncm(f);
struct usb_composite_dev *cdev = f->config->cdev;
DBG(cdev, "ncm deactivated\n");
if (ncm->port.in_ep->driver_data)
gether_disconnect(&ncm->port);
if (ncm->notify->driver_data) {
usb_ep_disable(ncm->notify);
ncm->notify->driver_data = NULL;
ncm->notify->desc = NULL;
}
}
/*-------------------------------------------------------------------------*/
/*
* Callbacks let us notify the host about connect/disconnect when the
* net device is opened or closed.
*
* For testing, note that link states on this side include both opened
* and closed variants of:
*
* - disconnected/unconfigured
* - configured but inactive (data alt 0)
* - configured and active (data alt 1)
*
* Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
* SET_INTERFACE (altsetting). Remember also that "configured" doesn't
* imply the host is actually polling the notification endpoint, and
* likewise that "active" doesn't imply it's actually using the data
* endpoints for traffic.
*/
static void ncm_open(struct gether *geth)
{
struct f_ncm *ncm = func_to_ncm(&geth->func);
DBG(ncm->port.func.config->cdev, "%s\n", __func__);
spin_lock(&ncm->lock);
ncm->is_open = true;
ncm_notify(ncm);
spin_unlock(&ncm->lock);
}
static void ncm_close(struct gether *geth)
{
struct f_ncm *ncm = func_to_ncm(&geth->func);
DBG(ncm->port.func.config->cdev, "%s\n", __func__);
spin_lock(&ncm->lock);
ncm->is_open = false;
ncm_notify(ncm);
spin_unlock(&ncm->lock);
}
/*-------------------------------------------------------------------------*/
/* ethernet function driver setup/binding */
static int __init
ncm_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_ncm *ncm = func_to_ncm(f);
int status;
struct usb_ep *ep;
/* allocate instance-specific interface IDs */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ncm->ctrl_id = status;
ncm_iad_desc.bFirstInterface = status;
ncm_control_intf.bInterfaceNumber = status;
ncm_union_desc.bMasterInterface0 = status;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ncm->data_id = status;
ncm_data_nop_intf.bInterfaceNumber = status;
ncm_data_intf.bInterfaceNumber = status;
ncm_union_desc.bSlaveInterface0 = status;
status = -ENODEV;
/* allocate instance-specific endpoints */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc);
if (!ep)
goto fail;
ncm->port.in_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
if (!ep)
goto fail;
ncm->port.out_ep = ep;
ep->driver_data = cdev; /* claim */
ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
if (!ep)
goto fail;
ncm->notify = ep;
ep->driver_data = cdev; /* claim */
status = -ENOMEM;
/* allocate notification request and buffer */
ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
if (!ncm->notify_req)
goto fail;
ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL);
if (!ncm->notify_req->buf)
goto fail;
ncm->notify_req->context = ncm;
ncm->notify_req->complete = ncm_notify_complete;
/*
* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
hs_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress;
hs_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress;
hs_ncm_notify_desc.bEndpointAddress =
fs_ncm_notify_desc.bEndpointAddress;
status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function,
NULL);
/*
* NOTE: all that is done without knowing or caring about
* the network link ... which is unavailable to this code
* until we're activated via set_alt().
*/
ncm->port.open = ncm_open;
ncm->port.close = ncm_close;
DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
ncm->port.in_ep->name, ncm->port.out_ep->name,
ncm->notify->name);
return 0;
fail:
usb_free_all_descriptors(f);
if (ncm->notify_req) {
kfree(ncm->notify_req->buf);
usb_ep_free_request(ncm->notify, ncm->notify_req);
}
/* we might as well release our claims on endpoints */
if (ncm->notify)
ncm->notify->driver_data = NULL;
if (ncm->port.out_ep)
ncm->port.out_ep->driver_data = NULL;
if (ncm->port.in_ep)
ncm->port.in_ep->driver_data = NULL;
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
return status;
}
static void
ncm_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_ncm *ncm = func_to_ncm(f);
DBG(c->cdev, "ncm unbind\n");
ncm_string_defs[0].id = 0;
usb_free_all_descriptors(f);
kfree(ncm->notify_req->buf);
usb_ep_free_request(ncm->notify, ncm->notify_req);
kfree(ncm);
}
/**
* ncm_bind_config - add CDC Network link to a configuration
* @c: the configuration to support the network link
* @ethaddr: a buffer in which the ethernet address of the host side
* side of the link was recorded
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*
* Caller must have called @gether_setup(). Caller is also responsible
* for calling @gether_cleanup() before module unload.
*/
int __init ncm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN])
{
struct f_ncm *ncm;
int status;
if (!can_support_ecm(c->cdev->gadget) || !ethaddr)
return -EINVAL;
if (ncm_string_defs[0].id == 0) {
status = usb_string_ids_tab(c->cdev, ncm_string_defs);
if (status < 0)
return status;
ncm_control_intf.iInterface =
ncm_string_defs[STRING_CTRL_IDX].id;
status = ncm_string_defs[STRING_DATA_IDX].id;
ncm_data_nop_intf.iInterface = status;
ncm_data_intf.iInterface = status;
ecm_desc.iMACAddress = ncm_string_defs[STRING_MAC_IDX].id;
ncm_iad_desc.iFunction = ncm_string_defs[STRING_IAD_IDX].id;
}
/* allocate and initialize one new instance */
ncm = kzalloc(sizeof *ncm, GFP_KERNEL);
if (!ncm)
return -ENOMEM;
/* export host's Ethernet address in CDC format */
snprintf(ncm->ethaddr, sizeof ncm->ethaddr, "%pm", ethaddr);
ncm_string_defs[STRING_MAC_IDX].s = ncm->ethaddr;
spin_lock_init(&ncm->lock);
ncm_reset_values(ncm);
ncm->port.is_fixed = true;
ncm->port.func.name = "cdc_network";
ncm->port.func.strings = ncm_strings;
/* descriptors are per-instance copies */
ncm->port.func.bind = ncm_bind;
ncm->port.func.unbind = ncm_unbind;
ncm->port.func.set_alt = ncm_set_alt;
ncm->port.func.get_alt = ncm_get_alt;
ncm->port.func.setup = ncm_setup;
ncm->port.func.disable = ncm_disable;
ncm->port.wrap = ncm_wrap_ntb;
ncm->port.unwrap = ncm_unwrap_ntb;
status = usb_add_function(c, &ncm->port.func);
if (status)
kfree(ncm);
return status;
}
|