aboutsummaryrefslogtreecommitdiff
path: root/drivers/greybus/es2.c
blob: 1df6ab5d339dcb026055af18184c49da1255733d (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Greybus "AP" USB driver for "ES2" controller chips
 *
 * Copyright 2014-2015 Google Inc.
 * Copyright 2014-2015 Linaro Ltd.
 */
#include <linux/kthread.h>
#include <linux/sizes.h>
#include <linux/usb.h>
#include <linux/kfifo.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/greybus.h>
#include <asm/unaligned.h>

#include "arpc.h"
#include "greybus_trace.h"


/* Default timeout for USB vendor requests. */
#define ES2_USB_CTRL_TIMEOUT	500

/* Default timeout for ARPC CPort requests */
#define ES2_ARPC_CPORT_TIMEOUT	500

/* Fixed CPort numbers */
#define ES2_CPORT_CDSI0		16
#define ES2_CPORT_CDSI1		17

/* Memory sizes for the buffers sent to/from the ES2 controller */
#define ES2_GBUF_MSG_SIZE_MAX	2048

/* Memory sizes for the ARPC buffers */
#define ARPC_OUT_SIZE_MAX	U16_MAX
#define ARPC_IN_SIZE_MAX	128

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x18d1, 0x1eaf) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

#define APB1_LOG_SIZE		SZ_16K

/*
 * Number of CPort IN urbs in flight at any point in time.
 * Adjust if we are having stalls in the USB buffer due to not enough urbs in
 * flight.
 */
#define NUM_CPORT_IN_URB	4

/* Number of CPort OUT urbs in flight at any point in time.
 * Adjust if we get messages saying we are out of urbs in the system log.
 */
#define NUM_CPORT_OUT_URB	8

/*
 * Number of ARPC in urbs in flight at any point in time.
 */
#define NUM_ARPC_IN_URB		2

/*
 * @endpoint: bulk in endpoint for CPort data
 * @urb: array of urbs for the CPort in messages
 * @buffer: array of buffers for the @cport_in_urb urbs
 */
struct es2_cport_in {
	__u8 endpoint;
	struct urb *urb[NUM_CPORT_IN_URB];
	u8 *buffer[NUM_CPORT_IN_URB];
};

/**
 * es2_ap_dev - ES2 USB Bridge to AP structure
 * @usb_dev: pointer to the USB device we are.
 * @usb_intf: pointer to the USB interface we are bound to.
 * @hd: pointer to our gb_host_device structure

 * @cport_in: endpoint, urbs and buffer for cport in messages
 * @cport_out_endpoint: endpoint for for cport out messages
 * @cport_out_urb: array of urbs for the CPort out messages
 * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
 *			not.
 * @cport_out_urb_cancelled: array of flags indicating whether the
 *			corresponding @cport_out_urb is being cancelled
 * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
 *
 * @apb_log_task: task pointer for logging thread
 * @apb_log_dentry: file system entry for the log file interface
 * @apb_log_enable_dentry: file system entry for enabling logging
 * @apb_log_fifo: kernel FIFO to carry logged data
 * @arpc_urb: array of urbs for the ARPC in messages
 * @arpc_buffer: array of buffers for the @arpc_urb urbs
 * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
 * @arpc_id_cycle: gives an unique id to ARPC
 * @arpc_lock: locks ARPC list
 * @arpcs: list of in progress ARPCs
 */
struct es2_ap_dev {
	struct usb_device *usb_dev;
	struct usb_interface *usb_intf;
	struct gb_host_device *hd;

	struct es2_cport_in cport_in;
	__u8 cport_out_endpoint;
	struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
	bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
	bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
	spinlock_t cport_out_urb_lock;

	bool cdsi1_in_use;

	struct task_struct *apb_log_task;
	struct dentry *apb_log_dentry;
	struct dentry *apb_log_enable_dentry;
	DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);

	__u8 arpc_endpoint_in;
	struct urb *arpc_urb[NUM_ARPC_IN_URB];
	u8 *arpc_buffer[NUM_ARPC_IN_URB];

	int arpc_id_cycle;
	spinlock_t arpc_lock;
	struct list_head arpcs;
};

struct arpc {
	struct list_head list;
	struct arpc_request_message *req;
	struct arpc_response_message *resp;
	struct completion response_received;
	bool active;
};

static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
{
	return (struct es2_ap_dev *)&hd->hd_priv;
}

static void cport_out_callback(struct urb *urb);
static void usb_log_enable(struct es2_ap_dev *es2);
static void usb_log_disable(struct es2_ap_dev *es2);
static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
		     size_t size, int *result, unsigned int timeout);

static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
{
	struct usb_device *udev = es2->usb_dev;
	u8 *data;
	int retval;

	data = kmemdup(req, size, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				 cmd,
				 USB_DIR_OUT | USB_TYPE_VENDOR |
				 USB_RECIP_INTERFACE,
				 0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
	if (retval < 0)
		dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
	else
		retval = 0;

	kfree(data);
	return retval;
}

static void ap_urb_complete(struct urb *urb)
{
	struct usb_ctrlrequest *dr = urb->context;

	kfree(dr);
	usb_free_urb(urb);
}

static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
{
	struct usb_device *udev = es2->usb_dev;
	struct urb *urb;
	struct usb_ctrlrequest *dr;
	u8 *buf;
	int retval;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb)
		return -ENOMEM;

	dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
	if (!dr) {
		usb_free_urb(urb);
		return -ENOMEM;
	}

	buf = (u8 *)dr + sizeof(*dr);
	memcpy(buf, req, size);

	dr->bRequest = cmd;
	dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
	dr->wValue = 0;
	dr->wIndex = 0;
	dr->wLength = cpu_to_le16(size);

	usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
			     (unsigned char *)dr, buf, size,
			     ap_urb_complete, dr);
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval) {
		usb_free_urb(urb);
		kfree(dr);
	}
	return retval;
}

static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
		  bool async)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);

	if (async)
		return output_async(es2, req, size, cmd);

	return output_sync(es2, req, size, cmd);
}

static int es2_cport_in_enable(struct es2_ap_dev *es2,
			       struct es2_cport_in *cport_in)
{
	struct urb *urb;
	int ret;
	int i;

	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
		urb = cport_in->urb[i];

		ret = usb_submit_urb(urb, GFP_KERNEL);
		if (ret) {
			dev_err(&es2->usb_dev->dev,
				"failed to submit in-urb: %d\n", ret);
			goto err_kill_urbs;
		}
	}

	return 0;

err_kill_urbs:
	for (--i; i >= 0; --i) {
		urb = cport_in->urb[i];
		usb_kill_urb(urb);
	}

	return ret;
}

static void es2_cport_in_disable(struct es2_ap_dev *es2,
				 struct es2_cport_in *cport_in)
{
	struct urb *urb;
	int i;

	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
		urb = cport_in->urb[i];
		usb_kill_urb(urb);
	}
}

static int es2_arpc_in_enable(struct es2_ap_dev *es2)
{
	struct urb *urb;
	int ret;
	int i;

	for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
		urb = es2->arpc_urb[i];

		ret = usb_submit_urb(urb, GFP_KERNEL);
		if (ret) {
			dev_err(&es2->usb_dev->dev,
				"failed to submit arpc in-urb: %d\n", ret);
			goto err_kill_urbs;
		}
	}

	return 0;

err_kill_urbs:
	for (--i; i >= 0; --i) {
		urb = es2->arpc_urb[i];
		usb_kill_urb(urb);
	}

	return ret;
}

static void es2_arpc_in_disable(struct es2_ap_dev *es2)
{
	struct urb *urb;
	int i;

	for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
		urb = es2->arpc_urb[i];
		usb_kill_urb(urb);
	}
}

static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
{
	struct urb *urb = NULL;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&es2->cport_out_urb_lock, flags);

	/* Look in our pool of allocated urbs first, as that's the "fastest" */
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		if (!es2->cport_out_urb_busy[i] &&
		    !es2->cport_out_urb_cancelled[i]) {
			es2->cport_out_urb_busy[i] = true;
			urb = es2->cport_out_urb[i];
			break;
		}
	}
	spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
	if (urb)
		return urb;

	/*
	 * Crap, pool is empty, complain to the syslog and go allocate one
	 * dynamically as we have to succeed.
	 */
	dev_dbg(&es2->usb_dev->dev,
		"No free CPort OUT urbs, having to dynamically allocate one!\n");
	return usb_alloc_urb(0, gfp_mask);
}

static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
{
	unsigned long flags;
	int i;
	/*
	 * See if this was an urb in our pool, if so mark it "free", otherwise
	 * we need to free it ourselves.
	 */
	spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		if (urb == es2->cport_out_urb[i]) {
			es2->cport_out_urb_busy[i] = false;
			urb = NULL;
			break;
		}
	}
	spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);

	/* If urb is not NULL, then we need to free this urb */
	usb_free_urb(urb);
}

/*
 * We (ab)use the operation-message header pad bytes to transfer the
 * cport id in order to minimise overhead.
 */
static void
gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
{
	header->pad[0] = cport_id;
}

/* Clear the pad bytes used for the CPort id */
static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
{
	header->pad[0] = 0;
}

/* Extract the CPort id packed into the header, and clear it */
static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
{
	u16 cport_id = header->pad[0];

	gb_message_cport_clear(header);

	return cport_id;
}

/*
 * Returns zero if the message was successfully queued, or a negative errno
 * otherwise.
 */
static int message_send(struct gb_host_device *hd, u16 cport_id,
			struct gb_message *message, gfp_t gfp_mask)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct usb_device *udev = es2->usb_dev;
	size_t buffer_size;
	int retval;
	struct urb *urb;
	unsigned long flags;

	/*
	 * The data actually transferred will include an indication
	 * of where the data should be sent.  Do one last check of
	 * the target CPort id before filling it in.
	 */
	if (!cport_id_valid(hd, cport_id)) {
		dev_err(&udev->dev, "invalid cport %u\n", cport_id);
		return -EINVAL;
	}

	/* Find a free urb */
	urb = next_free_urb(es2, gfp_mask);
	if (!urb)
		return -ENOMEM;

	spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
	message->hcpriv = urb;
	spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);

	/* Pack the cport id into the message header */
	gb_message_cport_pack(message->header, cport_id);

	buffer_size = sizeof(*message->header) + message->payload_size;

	usb_fill_bulk_urb(urb, udev,
			  usb_sndbulkpipe(udev,
					  es2->cport_out_endpoint),
			  message->buffer, buffer_size,
			  cport_out_callback, message);
	urb->transfer_flags |= URB_ZERO_PACKET;

	trace_gb_message_submit(message);

	retval = usb_submit_urb(urb, gfp_mask);
	if (retval) {
		dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);

		spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
		message->hcpriv = NULL;
		spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);

		free_urb(es2, urb);
		gb_message_cport_clear(message->header);

		return retval;
	}

	return 0;
}

/*
 * Can not be called in atomic context.
 */
static void message_cancel(struct gb_message *message)
{
	struct gb_host_device *hd = message->operation->connection->hd;
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct urb *urb;
	int i;

	might_sleep();

	spin_lock_irq(&es2->cport_out_urb_lock);
	urb = message->hcpriv;

	/* Prevent dynamically allocated urb from being deallocated. */
	usb_get_urb(urb);

	/* Prevent pre-allocated urb from being reused. */
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		if (urb == es2->cport_out_urb[i]) {
			es2->cport_out_urb_cancelled[i] = true;
			break;
		}
	}
	spin_unlock_irq(&es2->cport_out_urb_lock);

	usb_kill_urb(urb);

	if (i < NUM_CPORT_OUT_URB) {
		spin_lock_irq(&es2->cport_out_urb_lock);
		es2->cport_out_urb_cancelled[i] = false;
		spin_unlock_irq(&es2->cport_out_urb_lock);
	}

	usb_free_urb(urb);
}

static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
			      unsigned long flags)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct ida *id_map = &hd->cport_id_map;
	int ida_start, ida_end;

	switch (cport_id) {
	case ES2_CPORT_CDSI0:
	case ES2_CPORT_CDSI1:
		dev_err(&hd->dev, "cport %d not available\n", cport_id);
		return -EBUSY;
	}

	if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
	    flags & GB_CONNECTION_FLAG_CDSI1) {
		if (es2->cdsi1_in_use) {
			dev_err(&hd->dev, "CDSI1 already in use\n");
			return -EBUSY;
		}

		es2->cdsi1_in_use = true;

		return ES2_CPORT_CDSI1;
	}

	if (cport_id < 0) {
		ida_start = 0;
		ida_end = hd->num_cports;
	} else if (cport_id < hd->num_cports) {
		ida_start = cport_id;
		ida_end = cport_id + 1;
	} else {
		dev_err(&hd->dev, "cport %d not available\n", cport_id);
		return -EINVAL;
	}

	return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
}

static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);

	switch (cport_id) {
	case ES2_CPORT_CDSI1:
		es2->cdsi1_in_use = false;
		return;
	}

	ida_simple_remove(&hd->cport_id_map, cport_id);
}

static int cport_enable(struct gb_host_device *hd, u16 cport_id,
			unsigned long flags)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct usb_device *udev = es2->usb_dev;
	struct gb_apb_request_cport_flags *req;
	u32 connection_flags;
	int ret;

	req = kzalloc(sizeof(*req), GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	connection_flags = 0;
	if (flags & GB_CONNECTION_FLAG_CONTROL)
		connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
	if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
		connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;

	req->flags = cpu_to_le32(connection_flags);

	dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
		cport_id, connection_flags);

	ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			      GB_APB_REQUEST_CPORT_FLAGS,
			      USB_DIR_OUT | USB_TYPE_VENDOR |
			      USB_RECIP_INTERFACE, cport_id, 0,
			      req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
	if (ret != sizeof(*req)) {
		dev_err(&udev->dev, "failed to set cport flags for port %d\n",
			cport_id);
		if (ret >= 0)
			ret = -EIO;

		goto out;
	}

	ret = 0;
out:
	kfree(req);

	return ret;
}

static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct device *dev = &es2->usb_dev->dev;
	struct arpc_cport_connected_req req;
	int ret;

	req.cport_id = cpu_to_le16(cport_id);
	ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
			NULL, ES2_ARPC_CPORT_TIMEOUT);
	if (ret) {
		dev_err(dev, "failed to set connected state for cport %u: %d\n",
			cport_id, ret);
		return ret;
	}

	return 0;
}

static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct device *dev = &es2->usb_dev->dev;
	struct arpc_cport_flush_req req;
	int ret;

	req.cport_id = cpu_to_le16(cport_id);
	ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
			NULL, ES2_ARPC_CPORT_TIMEOUT);
	if (ret) {
		dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
		return ret;
	}

	return 0;
}

static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
			      u8 phase, unsigned int timeout)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct device *dev = &es2->usb_dev->dev;
	struct arpc_cport_shutdown_req req;
	int result;
	int ret;

	if (timeout > U16_MAX)
		return -EINVAL;

	req.cport_id = cpu_to_le16(cport_id);
	req.timeout = cpu_to_le16(timeout);
	req.phase = phase;
	ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
			&result, ES2_ARPC_CPORT_TIMEOUT + timeout);
	if (ret) {
		dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
			cport_id, ret, result);
		return ret;
	}

	return 0;
}

static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
			     size_t peer_space, unsigned int timeout)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct device *dev = &es2->usb_dev->dev;
	struct arpc_cport_quiesce_req req;
	int result;
	int ret;

	if (peer_space > U16_MAX)
		return -EINVAL;

	if (timeout > U16_MAX)
		return -EINVAL;

	req.cport_id = cpu_to_le16(cport_id);
	req.peer_space = cpu_to_le16(peer_space);
	req.timeout = cpu_to_le16(timeout);
	ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
			&result, ES2_ARPC_CPORT_TIMEOUT + timeout);
	if (ret) {
		dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
			cport_id, ret, result);
		return ret;
	}

	return 0;
}

static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
{
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct device *dev = &es2->usb_dev->dev;
	struct arpc_cport_clear_req req;
	int ret;

	req.cport_id = cpu_to_le16(cport_id);
	ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
			NULL, ES2_ARPC_CPORT_TIMEOUT);
	if (ret) {
		dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
		return ret;
	}

	return 0;
}

static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
{
	int retval;
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct usb_device *udev = es2->usb_dev;

	retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				 GB_APB_REQUEST_LATENCY_TAG_EN,
				 USB_DIR_OUT | USB_TYPE_VENDOR |
				 USB_RECIP_INTERFACE, cport_id, 0, NULL,
				 0, ES2_USB_CTRL_TIMEOUT);

	if (retval < 0)
		dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
			cport_id);
	return retval;
}

static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
{
	int retval;
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	struct usb_device *udev = es2->usb_dev;

	retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				 GB_APB_REQUEST_LATENCY_TAG_DIS,
				 USB_DIR_OUT | USB_TYPE_VENDOR |
				 USB_RECIP_INTERFACE, cport_id, 0, NULL,
				 0, ES2_USB_CTRL_TIMEOUT);

	if (retval < 0)
		dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
			cport_id);
	return retval;
}

static struct gb_hd_driver es2_driver = {
	.hd_priv_size			= sizeof(struct es2_ap_dev),
	.message_send			= message_send,
	.message_cancel			= message_cancel,
	.cport_allocate			= es2_cport_allocate,
	.cport_release			= es2_cport_release,
	.cport_enable			= cport_enable,
	.cport_connected		= es2_cport_connected,
	.cport_flush			= es2_cport_flush,
	.cport_shutdown			= es2_cport_shutdown,
	.cport_quiesce			= es2_cport_quiesce,
	.cport_clear			= es2_cport_clear,
	.latency_tag_enable		= latency_tag_enable,
	.latency_tag_disable		= latency_tag_disable,
	.output				= output,
};

/* Common function to report consistent warnings based on URB status */
static int check_urb_status(struct urb *urb)
{
	struct device *dev = &urb->dev->dev;
	int status = urb->status;

	switch (status) {
	case 0:
		return 0;

	case -EOVERFLOW:
		dev_err(dev, "%s: overflow actual length is %d\n",
			__func__, urb->actual_length);
		fallthrough;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	case -EILSEQ:
	case -EPROTO:
		/* device is gone, stop sending */
		return status;
	}
	dev_err(dev, "%s: unknown status %d\n", __func__, status);

	return -EAGAIN;
}

static void es2_destroy(struct es2_ap_dev *es2)
{
	struct usb_device *udev;
	struct urb *urb;
	int i;

	debugfs_remove(es2->apb_log_enable_dentry);
	usb_log_disable(es2);

	/* Tear down everything! */
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		urb = es2->cport_out_urb[i];
		usb_kill_urb(urb);
		usb_free_urb(urb);
		es2->cport_out_urb[i] = NULL;
		es2->cport_out_urb_busy[i] = false;	/* just to be anal */
	}

	for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
		usb_free_urb(es2->arpc_urb[i]);
		kfree(es2->arpc_buffer[i]);
		es2->arpc_buffer[i] = NULL;
	}

	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
		usb_free_urb(es2->cport_in.urb[i]);
		kfree(es2->cport_in.buffer[i]);
		es2->cport_in.buffer[i] = NULL;
	}

	/* release reserved CDSI0 and CDSI1 cports */
	gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
	gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);

	udev = es2->usb_dev;
	gb_hd_put(es2->hd);

	usb_put_dev(udev);
}

static void cport_in_callback(struct urb *urb)
{
	struct gb_host_device *hd = urb->context;
	struct device *dev = &urb->dev->dev;
	struct gb_operation_msg_hdr *header;
	int status = check_urb_status(urb);
	int retval;
	u16 cport_id;

	if (status) {
		if ((status == -EAGAIN) || (status == -EPROTO))
			goto exit;

		/* The urb is being unlinked */
		if (status == -ENOENT || status == -ESHUTDOWN)
			return;

		dev_err(dev, "urb cport in error %d (dropped)\n", status);
		return;
	}

	if (urb->actual_length < sizeof(*header)) {
		dev_err(dev, "short message received\n");
		goto exit;
	}

	/* Extract the CPort id, which is packed in the message header */
	header = urb->transfer_buffer;
	cport_id = gb_message_cport_unpack(header);

	if (cport_id_valid(hd, cport_id)) {
		greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
				  urb->actual_length);
	} else {
		dev_err(dev, "invalid cport id %u received\n", cport_id);
	}
exit:
	/* put our urb back in the request pool */
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
}

static void cport_out_callback(struct urb *urb)
{
	struct gb_message *message = urb->context;
	struct gb_host_device *hd = message->operation->connection->hd;
	struct es2_ap_dev *es2 = hd_to_es2(hd);
	int status = check_urb_status(urb);
	unsigned long flags;

	gb_message_cport_clear(message->header);

	spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
	message->hcpriv = NULL;
	spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);

	/*
	 * Tell the submitter that the message send (attempt) is
	 * complete, and report the status.
	 */
	greybus_message_sent(hd, message, status);

	free_urb(es2, urb);
}

static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
{
	struct arpc *rpc;

	if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
		return NULL;

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

	INIT_LIST_HEAD(&rpc->list);
	rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
	if (!rpc->req)
		goto err_free_rpc;

	rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
	if (!rpc->resp)
		goto err_free_req;

	rpc->req->type = type;
	rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size);
	memcpy(rpc->req->data, payload, size);

	init_completion(&rpc->response_received);

	return rpc;

err_free_req:
	kfree(rpc->req);
err_free_rpc:
	kfree(rpc);

	return NULL;
}

static void arpc_free(struct arpc *rpc)
{
	kfree(rpc->req);
	kfree(rpc->resp);
	kfree(rpc);
}

static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
{
	struct arpc *rpc;

	list_for_each_entry(rpc, &es2->arpcs, list) {
		if (rpc->req->id == id)
			return rpc;
	}

	return NULL;
}

static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
{
	rpc->active = true;
	rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
	list_add_tail(&rpc->list, &es2->arpcs);
}

static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
{
	if (rpc->active) {
		rpc->active = false;
		list_del(&rpc->list);
	}
}

static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
{
	struct usb_device *udev = es2->usb_dev;
	int retval;

	retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
				 GB_APB_REQUEST_ARPC_RUN,
				 USB_DIR_OUT | USB_TYPE_VENDOR |
				 USB_RECIP_INTERFACE,
				 0, 0,
				 rpc->req, le16_to_cpu(rpc->req->size),
				 ES2_USB_CTRL_TIMEOUT);
	if (retval != le16_to_cpu(rpc->req->size)) {
		dev_err(&udev->dev,
			"failed to send ARPC request %d: %d\n",
			rpc->req->type, retval);
		if (retval > 0)
			retval = -EIO;
		return retval;
	}

	return 0;
}

static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
		     size_t size, int *result, unsigned int timeout)
{
	struct arpc *rpc;
	unsigned long flags;
	int retval;

	if (result)
		*result = 0;

	rpc = arpc_alloc(payload, size, type);
	if (!rpc)
		return -ENOMEM;

	spin_lock_irqsave(&es2->arpc_lock, flags);
	arpc_add(es2, rpc);
	spin_unlock_irqrestore(&es2->arpc_lock, flags);

	retval = arpc_send(es2, rpc, timeout);
	if (retval)
		goto out_arpc_del;

	retval = wait_for_completion_interruptible_timeout(
						&rpc->response_received,
						msecs_to_jiffies(timeout));
	if (retval <= 0) {
		if (!retval)
			retval = -ETIMEDOUT;
		goto out_arpc_del;
	}

	if (rpc->resp->result) {
		retval = -EREMOTEIO;
		if (result)
			*result = rpc->resp->result;
	} else {
		retval = 0;
	}

out_arpc_del:
	spin_lock_irqsave(&es2->arpc_lock, flags);
	arpc_del(es2, rpc);
	spin_unlock_irqrestore(&es2->arpc_lock, flags);
	arpc_free(rpc);

	if (retval < 0 && retval != -EREMOTEIO) {
		dev_err(&es2->usb_dev->dev,
			"failed to execute ARPC: %d\n", retval);
	}

	return retval;
}

static void arpc_in_callback(struct urb *urb)
{
	struct es2_ap_dev *es2 = urb->context;
	struct device *dev = &urb->dev->dev;
	int status = check_urb_status(urb);
	struct arpc *rpc;
	struct arpc_response_message *resp;
	unsigned long flags;
	int retval;

	if (status) {
		if ((status == -EAGAIN) || (status == -EPROTO))
			goto exit;

		/* The urb is being unlinked */
		if (status == -ENOENT || status == -ESHUTDOWN)
			return;

		dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
		return;
	}

	if (urb->actual_length < sizeof(*resp)) {
		dev_err(dev, "short aprc response received\n");
		goto exit;
	}

	resp = urb->transfer_buffer;
	spin_lock_irqsave(&es2->arpc_lock, flags);
	rpc = arpc_find(es2, resp->id);
	if (!rpc) {
		dev_err(dev, "invalid arpc response id received: %u\n",
			le16_to_cpu(resp->id));
		spin_unlock_irqrestore(&es2->arpc_lock, flags);
		goto exit;
	}

	arpc_del(es2, rpc);
	memcpy(rpc->resp, resp, sizeof(*resp));
	complete(&rpc->response_received);
	spin_unlock_irqrestore(&es2->arpc_lock, flags);

exit:
	/* put our urb back in the request pool */
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
}

#define APB1_LOG_MSG_SIZE	64
static void apb_log_get(struct es2_ap_dev *es2, char *buf)
{
	int retval;

	do {
		retval = usb_control_msg(es2->usb_dev,
					 usb_rcvctrlpipe(es2->usb_dev, 0),
					 GB_APB_REQUEST_LOG,
					 USB_DIR_IN | USB_TYPE_VENDOR |
					 USB_RECIP_INTERFACE,
					 0x00, 0x00,
					 buf,
					 APB1_LOG_MSG_SIZE,
					 ES2_USB_CTRL_TIMEOUT);
		if (retval > 0)
			kfifo_in(&es2->apb_log_fifo, buf, retval);
	} while (retval > 0);
}

static int apb_log_poll(void *data)
{
	struct es2_ap_dev *es2 = data;
	char *buf;

	buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	while (!kthread_should_stop()) {
		msleep(1000);
		apb_log_get(es2, buf);
	}

	kfree(buf);

	return 0;
}

static ssize_t apb_log_read(struct file *f, char __user *buf,
			    size_t count, loff_t *ppos)
{
	struct es2_ap_dev *es2 = file_inode(f)->i_private;
	ssize_t ret;
	size_t copied;
	char *tmp_buf;

	if (count > APB1_LOG_SIZE)
		count = APB1_LOG_SIZE;

	tmp_buf = kmalloc(count, GFP_KERNEL);
	if (!tmp_buf)
		return -ENOMEM;

	copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
	ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);

	kfree(tmp_buf);

	return ret;
}

static const struct file_operations apb_log_fops = {
	.read	= apb_log_read,
};

static void usb_log_enable(struct es2_ap_dev *es2)
{
	if (!IS_ERR_OR_NULL(es2->apb_log_task))
		return;

	/* get log from APB1 */
	es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
	if (IS_ERR(es2->apb_log_task))
		return;
	/* XXX We will need to rename this per APB */
	es2->apb_log_dentry = debugfs_create_file("apb_log", 0444,
						  gb_debugfs_get(), es2,
						  &apb_log_fops);
}

static void usb_log_disable(struct es2_ap_dev *es2)
{
	if (IS_ERR_OR_NULL(es2->apb_log_task))
		return;

	debugfs_remove(es2->apb_log_dentry);
	es2->apb_log_dentry = NULL;

	kthread_stop(es2->apb_log_task);
	es2->apb_log_task = NULL;
}

static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
				   size_t count, loff_t *ppos)
{
	struct es2_ap_dev *es2 = file_inode(f)->i_private;
	int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
	char tmp_buf[3];

	sprintf(tmp_buf, "%d\n", enable);
	return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
}

static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
				    size_t count, loff_t *ppos)
{
	int enable;
	ssize_t retval;
	struct es2_ap_dev *es2 = file_inode(f)->i_private;

	retval = kstrtoint_from_user(buf, count, 10, &enable);
	if (retval)
		return retval;

	if (enable)
		usb_log_enable(es2);
	else
		usb_log_disable(es2);

	return count;
}

static const struct file_operations apb_log_enable_fops = {
	.read	= apb_log_enable_read,
	.write	= apb_log_enable_write,
};

static int apb_get_cport_count(struct usb_device *udev)
{
	int retval;
	__le16 *cport_count;

	cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
	if (!cport_count)
		return -ENOMEM;

	retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
				 GB_APB_REQUEST_CPORT_COUNT,
				 USB_DIR_IN | USB_TYPE_VENDOR |
				 USB_RECIP_INTERFACE, 0, 0, cport_count,
				 sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
	if (retval != sizeof(*cport_count)) {
		dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
			retval);

		if (retval >= 0)
			retval = -EIO;

		goto out;
	}

	retval = le16_to_cpu(*cport_count);

	/* We need to fit a CPort ID in one byte of a message header */
	if (retval > U8_MAX) {
		retval = U8_MAX;
		dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
	}

out:
	kfree(cport_count);
	return retval;
}

/*
 * The ES2 USB Bridge device has 15 endpoints
 * 1 Control - usual USB stuff + AP -> APBridgeA messages
 * 7 Bulk IN - CPort data in
 * 7 Bulk OUT - CPort data out
 */
static int ap_probe(struct usb_interface *interface,
		    const struct usb_device_id *id)
{
	struct es2_ap_dev *es2;
	struct gb_host_device *hd;
	struct usb_device *udev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	__u8 ep_addr;
	int retval;
	int i;
	int num_cports;
	bool bulk_out_found = false;
	bool bulk_in_found = false;
	bool arpc_in_found = false;

	udev = usb_get_dev(interface_to_usbdev(interface));

	num_cports = apb_get_cport_count(udev);
	if (num_cports < 0) {
		usb_put_dev(udev);
		dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
			num_cports);
		return num_cports;
	}

	hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
			  num_cports);
	if (IS_ERR(hd)) {
		usb_put_dev(udev);
		return PTR_ERR(hd);
	}

	es2 = hd_to_es2(hd);
	es2->hd = hd;
	es2->usb_intf = interface;
	es2->usb_dev = udev;
	spin_lock_init(&es2->cport_out_urb_lock);
	INIT_KFIFO(es2->apb_log_fifo);
	usb_set_intfdata(interface, es2);

	/*
	 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
	 * dynamically.
	 */
	retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
	if (retval)
		goto error;
	retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
	if (retval)
		goto error;

	/* find all bulk endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;
		ep_addr = endpoint->bEndpointAddress;

		if (usb_endpoint_is_bulk_in(endpoint)) {
			if (!bulk_in_found) {
				es2->cport_in.endpoint = ep_addr;
				bulk_in_found = true;
			} else if (!arpc_in_found) {
				es2->arpc_endpoint_in = ep_addr;
				arpc_in_found = true;
			} else {
				dev_warn(&udev->dev,
					 "Unused bulk IN endpoint found: 0x%02x\n",
					 ep_addr);
			}
			continue;
		}
		if (usb_endpoint_is_bulk_out(endpoint)) {
			if (!bulk_out_found) {
				es2->cport_out_endpoint = ep_addr;
				bulk_out_found = true;
			} else {
				dev_warn(&udev->dev,
					 "Unused bulk OUT endpoint found: 0x%02x\n",
					 ep_addr);
			}
			continue;
		}
		dev_warn(&udev->dev,
			 "Unknown endpoint type found, address 0x%02x\n",
			 ep_addr);
	}
	if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
		dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
		retval = -ENODEV;
		goto error;
	}

	/* Allocate buffers for our cport in messages */
	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
		struct urb *urb;
		u8 *buffer;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}
		es2->cport_in.urb[i] = urb;

		buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
		if (!buffer) {
			retval = -ENOMEM;
			goto error;
		}

		usb_fill_bulk_urb(urb, udev,
				  usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
				  buffer, ES2_GBUF_MSG_SIZE_MAX,
				  cport_in_callback, hd);

		es2->cport_in.buffer[i] = buffer;
	}

	/* Allocate buffers for ARPC in messages */
	for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
		struct urb *urb;
		u8 *buffer;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}
		es2->arpc_urb[i] = urb;

		buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
		if (!buffer) {
			retval = -ENOMEM;
			goto error;
		}

		usb_fill_bulk_urb(urb, udev,
				  usb_rcvbulkpipe(udev,
						  es2->arpc_endpoint_in),
				  buffer, ARPC_IN_SIZE_MAX,
				  arpc_in_callback, es2);

		es2->arpc_buffer[i] = buffer;
	}

	/* Allocate urbs for our CPort OUT messages */
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		struct urb *urb;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}

		es2->cport_out_urb[i] = urb;
		es2->cport_out_urb_busy[i] = false;	/* just to be anal */
	}

	/* XXX We will need to rename this per APB */
	es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
							 0644,
							 gb_debugfs_get(), es2,
							 &apb_log_enable_fops);

	INIT_LIST_HEAD(&es2->arpcs);
	spin_lock_init(&es2->arpc_lock);

	retval = es2_arpc_in_enable(es2);
	if (retval)
		goto error;

	retval = gb_hd_add(hd);
	if (retval)
		goto err_disable_arpc_in;

	retval = es2_cport_in_enable(es2, &es2->cport_in);
	if (retval)
		goto err_hd_del;

	return 0;

err_hd_del:
	gb_hd_del(hd);
err_disable_arpc_in:
	es2_arpc_in_disable(es2);
error:
	es2_destroy(es2);

	return retval;
}

static void ap_disconnect(struct usb_interface *interface)
{
	struct es2_ap_dev *es2 = usb_get_intfdata(interface);

	gb_hd_del(es2->hd);

	es2_cport_in_disable(es2, &es2->cport_in);
	es2_arpc_in_disable(es2);

	es2_destroy(es2);
}

static struct usb_driver es2_ap_driver = {
	.name =		"es2_ap_driver",
	.probe =	ap_probe,
	.disconnect =	ap_disconnect,
	.id_table =	id_table,
	.soft_unbind =	1,
};

module_usb_driver(es2_ap_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");