aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/crypto/zcrypt_api.c
blob: cb22b97944b8513ad553a68f133eca9ba28728f1 (plain) (blame)
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
/*
 *  linux/drivers/s390/crypto/zcrypt_api.c
 *
 *  zcrypt 2.1.0
 *
 *  Copyright (C)  2001, 2006 IBM Corporation
 *  Author(s): Robert Burroughs
 *	       Eric Rossman (edrossma@us.ibm.com)
 *	       Cornelia Huck <cornelia.huck@de.ibm.com>
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/compat.h>
#include <linux/smp_lock.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <linux/hw_random.h>

#include "zcrypt_api.h"

/*
 * Module description.
 */
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Cryptographic Coprocessor interface, "
		   "Copyright 2001, 2006 IBM Corporation");
MODULE_LICENSE("GPL");

static DEFINE_SPINLOCK(zcrypt_device_lock);
static LIST_HEAD(zcrypt_device_list);
static int zcrypt_device_count = 0;
static atomic_t zcrypt_open_count = ATOMIC_INIT(0);

static int zcrypt_rng_device_add(void);
static void zcrypt_rng_device_remove(void);

/*
 * Device attributes common for all crypto devices.
 */
static ssize_t zcrypt_type_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
	return snprintf(buf, PAGE_SIZE, "%s\n", zdev->type_string);
}

static DEVICE_ATTR(type, 0444, zcrypt_type_show, NULL);

static ssize_t zcrypt_online_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
	return snprintf(buf, PAGE_SIZE, "%d\n", zdev->online);
}

static ssize_t zcrypt_online_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct zcrypt_device *zdev = to_ap_dev(dev)->private;
	int online;

	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
		return -EINVAL;
	zdev->online = online;
	if (!online)
		ap_flush_queue(zdev->ap_dev);
	return count;
}

static DEVICE_ATTR(online, 0644, zcrypt_online_show, zcrypt_online_store);

static struct attribute * zcrypt_device_attrs[] = {
	&dev_attr_type.attr,
	&dev_attr_online.attr,
	NULL,
};

static struct attribute_group zcrypt_device_attr_group = {
	.attrs = zcrypt_device_attrs,
};

/**
 * __zcrypt_increase_preference(): Increase preference of a crypto device.
 * @zdev: Pointer the crypto device
 *
 * Move the device towards the head of the device list.
 * Need to be called while holding the zcrypt device list lock.
 * Note: cards with speed_rating of 0 are kept at the end of the list.
 */
static void __zcrypt_increase_preference(struct zcrypt_device *zdev)
{
	struct zcrypt_device *tmp;
	struct list_head *l;

	if (zdev->speed_rating == 0)
		return;
	for (l = zdev->list.prev; l != &zcrypt_device_list; l = l->prev) {
		tmp = list_entry(l, struct zcrypt_device, list);
		if ((tmp->request_count + 1) * tmp->speed_rating <=
		    (zdev->request_count + 1) * zdev->speed_rating &&
		    tmp->speed_rating != 0)
			break;
	}
	if (l == zdev->list.prev)
		return;
	/* Move zdev behind l */
	list_del(&zdev->list);
	list_add(&zdev->list, l);
}

/**
 * __zcrypt_decrease_preference(): Decrease preference of a crypto device.
 * @zdev: Pointer to a crypto device.
 *
 * Move the device towards the tail of the device list.
 * Need to be called while holding the zcrypt device list lock.
 * Note: cards with speed_rating of 0 are kept at the end of the list.
 */
static void __zcrypt_decrease_preference(struct zcrypt_device *zdev)
{
	struct zcrypt_device *tmp;
	struct list_head *l;

	if (zdev->speed_rating == 0)
		return;
	for (l = zdev->list.next; l != &zcrypt_device_list; l = l->next) {
		tmp = list_entry(l, struct zcrypt_device, list);
		if ((tmp->request_count + 1) * tmp->speed_rating >
		    (zdev->request_count + 1) * zdev->speed_rating ||
		    tmp->speed_rating == 0)
			break;
	}
	if (l == zdev->list.next)
		return;
	/* Move zdev before l */
	list_del(&zdev->list);
	list_add_tail(&zdev->list, l);
}

static void zcrypt_device_release(struct kref *kref)
{
	struct zcrypt_device *zdev =
		container_of(kref, struct zcrypt_device, refcount);
	zcrypt_device_free(zdev);
}

void zcrypt_device_get(struct zcrypt_device *zdev)
{
	kref_get(&zdev->refcount);
}
EXPORT_SYMBOL(zcrypt_device_get);

int zcrypt_device_put(struct zcrypt_device *zdev)
{
	return kref_put(&zdev->refcount, zcrypt_device_release);
}
EXPORT_SYMBOL(zcrypt_device_put);

struct zcrypt_device *zcrypt_device_alloc(size_t max_response_size)
{
	struct zcrypt_device *zdev;

	zdev = kzalloc(sizeof(struct zcrypt_device), GFP_KERNEL);
	if (!zdev)
		return NULL;
	zdev->reply.message = kmalloc(max_response_size, GFP_KERNEL);
	if (!zdev->reply.message)
		goto out_free;
	zdev->reply.length = max_response_size;
	spin_lock_init(&zdev->lock);
	INIT_LIST_HEAD(&zdev->list);
	return zdev;

out_free:
	kfree(zdev);
	return NULL;
}
EXPORT_SYMBOL(zcrypt_device_alloc);

void zcrypt_device_free(struct zcrypt_device *zdev)
{
	kfree(zdev->reply.message);
	kfree(zdev);
}
EXPORT_SYMBOL(zcrypt_device_free);

/**
 * zcrypt_device_register() - Register a crypto device.
 * @zdev: Pointer to a crypto device
 *
 * Register a crypto device. Returns 0 if successful.
 */
int zcrypt_device_register(struct zcrypt_device *zdev)
{
	int rc;

	rc = sysfs_create_group(&zdev->ap_dev->device.kobj,
				&zcrypt_device_attr_group);
	if (rc)
		goto out;
	get_device(&zdev->ap_dev->device);
	kref_init(&zdev->refcount);
	spin_lock_bh(&zcrypt_device_lock);
	zdev->online = 1;	/* New devices are online by default. */
	list_add_tail(&zdev->list, &zcrypt_device_list);
	__zcrypt_increase_preference(zdev);
	zcrypt_device_count++;
	spin_unlock_bh(&zcrypt_device_lock);
	if (zdev->ops->rng) {
		rc = zcrypt_rng_device_add();
		if (rc)
			goto out_unregister;
	}
	return 0;

out_unregister:
	spin_lock_bh(&zcrypt_device_lock);
	zcrypt_device_count--;
	list_del_init(&zdev->list);
	spin_unlock_bh(&zcrypt_device_lock);
	sysfs_remove_group(&zdev->ap_dev->device.kobj,
			   &zcrypt_device_attr_group);
	put_device(&zdev->ap_dev->device);
	zcrypt_device_put(zdev);
out:
	return rc;
}
EXPORT_SYMBOL(zcrypt_device_register);

/**
 * zcrypt_device_unregister(): Unregister a crypto device.
 * @zdev: Pointer to crypto device
 *
 * Unregister a crypto device.
 */
void zcrypt_device_unregister(struct zcrypt_device *zdev)
{
	if (zdev->ops->rng)
		zcrypt_rng_device_remove();
	spin_lock_bh(&zcrypt_device_lock);
	zcrypt_device_count--;
	list_del_init(&zdev->list);
	spin_unlock_bh(&zcrypt_device_lock);
	sysfs_remove_group(&zdev->ap_dev->device.kobj,
			   &zcrypt_device_attr_group);
	put_device(&zdev->ap_dev->device);
	zcrypt_device_put(zdev);
}
EXPORT_SYMBOL(zcrypt_device_unregister);

/**
 * zcrypt_read (): Not supported beyond zcrypt 1.3.1.
 *
 * This function is not supported beyond zcrypt 1.3.1.
 */
static ssize_t zcrypt_read(struct file *filp, char __user *buf,
			   size_t count, loff_t *f_pos)
{
	return -EPERM;
}

/**
 * zcrypt_write(): Not allowed.
 *
 * Write is is not allowed
 */
static ssize_t zcrypt_write(struct file *filp, const char __user *buf,
			    size_t count, loff_t *f_pos)
{
	return -EPERM;
}

/**
 * zcrypt_open(): Count number of users.
 *
 * Device open function to count number of users.
 */
static int zcrypt_open(struct inode *inode, struct file *filp)
{
	lock_kernel();
	atomic_inc(&zcrypt_open_count);
	unlock_kernel();
	return 0;
}

/**
 * zcrypt_release(): Count number of users.
 *
 * Device close function to count number of users.
 */
static int zcrypt_release(struct inode *inode, struct file *filp)
{
	atomic_dec(&zcrypt_open_count);
	return 0;
}

/*
 * zcrypt ioctls.
 */
static long zcrypt_rsa_modexpo(struct ica_rsa_modexpo *mex)
{
	struct zcrypt_device *zdev;
	int rc;

	if (mex->outputdatalength < mex->inputdatalength)
		return -EINVAL;
	/*
	 * As long as outputdatalength is big enough, we can set the
	 * outputdatalength equal to the inputdatalength, since that is the
	 * number of bytes we will copy in any case
	 */
	mex->outputdatalength = mex->inputdatalength;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		if (!zdev->online ||
		    !zdev->ops->rsa_modexpo ||
		    zdev->min_mod_size > mex->inputdatalength ||
		    zdev->max_mod_size < mex->inputdatalength)
			continue;
		zcrypt_device_get(zdev);
		get_device(&zdev->ap_dev->device);
		zdev->request_count++;
		__zcrypt_decrease_preference(zdev);
		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
			spin_unlock_bh(&zcrypt_device_lock);
			rc = zdev->ops->rsa_modexpo(zdev, mex);
			spin_lock_bh(&zcrypt_device_lock);
			module_put(zdev->ap_dev->drv->driver.owner);
		}
		else
			rc = -EAGAIN;
		zdev->request_count--;
		__zcrypt_increase_preference(zdev);
		put_device(&zdev->ap_dev->device);
		zcrypt_device_put(zdev);
		spin_unlock_bh(&zcrypt_device_lock);
		return rc;
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return -ENODEV;
}

static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
{
	struct zcrypt_device *zdev;
	unsigned long long z1, z2, z3;
	int rc, copied;

	if (crt->outputdatalength < crt->inputdatalength ||
	    (crt->inputdatalength & 1))
		return -EINVAL;
	/*
	 * As long as outputdatalength is big enough, we can set the
	 * outputdatalength equal to the inputdatalength, since that is the
	 * number of bytes we will copy in any case
	 */
	crt->outputdatalength = crt->inputdatalength;

	copied = 0;
 restart:
	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		if (!zdev->online ||
		    !zdev->ops->rsa_modexpo_crt ||
		    zdev->min_mod_size > crt->inputdatalength ||
		    zdev->max_mod_size < crt->inputdatalength)
			continue;
		if (zdev->short_crt && crt->inputdatalength > 240) {
			/*
			 * Check inputdata for leading zeros for cards
			 * that can't handle np_prime, bp_key, or
			 * u_mult_inv > 128 bytes.
			 */
			if (copied == 0) {
				int len;
				spin_unlock_bh(&zcrypt_device_lock);
				/* len is max 256 / 2 - 120 = 8 */
				len = crt->inputdatalength / 2 - 120;
				z1 = z2 = z3 = 0;
				if (copy_from_user(&z1, crt->np_prime, len) ||
				    copy_from_user(&z2, crt->bp_key, len) ||
				    copy_from_user(&z3, crt->u_mult_inv, len))
					return -EFAULT;
				copied = 1;
				/*
				 * We have to restart device lookup -
				 * the device list may have changed by now.
				 */
				goto restart;
			}
			if (z1 != 0ULL || z2 != 0ULL || z3 != 0ULL)
				/* The device can't handle this request. */
				continue;
		}
		zcrypt_device_get(zdev);
		get_device(&zdev->ap_dev->device);
		zdev->request_count++;
		__zcrypt_decrease_preference(zdev);
		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
			spin_unlock_bh(&zcrypt_device_lock);
			rc = zdev->ops->rsa_modexpo_crt(zdev, crt);
			spin_lock_bh(&zcrypt_device_lock);
			module_put(zdev->ap_dev->drv->driver.owner);
		}
		else
			rc = -EAGAIN;
		zdev->request_count--;
		__zcrypt_increase_preference(zdev);
		put_device(&zdev->ap_dev->device);
		zcrypt_device_put(zdev);
		spin_unlock_bh(&zcrypt_device_lock);
		return rc;
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return -ENODEV;
}

static long zcrypt_send_cprb(struct ica_xcRB *xcRB)
{
	struct zcrypt_device *zdev;
	int rc;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		if (!zdev->online || !zdev->ops->send_cprb ||
		    (xcRB->user_defined != AUTOSELECT &&
			AP_QID_DEVICE(zdev->ap_dev->qid) != xcRB->user_defined)
		    )
			continue;
		zcrypt_device_get(zdev);
		get_device(&zdev->ap_dev->device);
		zdev->request_count++;
		__zcrypt_decrease_preference(zdev);
		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
			spin_unlock_bh(&zcrypt_device_lock);
			rc = zdev->ops->send_cprb(zdev, xcRB);
			spin_lock_bh(&zcrypt_device_lock);
			module_put(zdev->ap_dev->drv->driver.owner);
		}
		else
			rc = -EAGAIN;
		zdev->request_count--;
		__zcrypt_increase_preference(zdev);
		put_device(&zdev->ap_dev->device);
		zcrypt_device_put(zdev);
		spin_unlock_bh(&zcrypt_device_lock);
		return rc;
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return -ENODEV;
}

static long zcrypt_rng(char *buffer)
{
	struct zcrypt_device *zdev;
	int rc;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		if (!zdev->online || !zdev->ops->rng)
			continue;
		zcrypt_device_get(zdev);
		get_device(&zdev->ap_dev->device);
		zdev->request_count++;
		__zcrypt_decrease_preference(zdev);
		if (try_module_get(zdev->ap_dev->drv->driver.owner)) {
			spin_unlock_bh(&zcrypt_device_lock);
			rc = zdev->ops->rng(zdev, buffer);
			spin_lock_bh(&zcrypt_device_lock);
			module_put(zdev->ap_dev->drv->driver.owner);
		} else
			rc = -EAGAIN;
		zdev->request_count--;
		__zcrypt_increase_preference(zdev);
		put_device(&zdev->ap_dev->device);
		zcrypt_device_put(zdev);
		spin_unlock_bh(&zcrypt_device_lock);
		return rc;
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return -ENODEV;
}

static void zcrypt_status_mask(char status[AP_DEVICES])
{
	struct zcrypt_device *zdev;

	memset(status, 0, sizeof(char) * AP_DEVICES);
	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list)
		status[AP_QID_DEVICE(zdev->ap_dev->qid)] =
			zdev->online ? zdev->user_space_type : 0x0d;
	spin_unlock_bh(&zcrypt_device_lock);
}

static void zcrypt_qdepth_mask(char qdepth[AP_DEVICES])
{
	struct zcrypt_device *zdev;

	memset(qdepth, 0, sizeof(char)	* AP_DEVICES);
	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		spin_lock(&zdev->ap_dev->lock);
		qdepth[AP_QID_DEVICE(zdev->ap_dev->qid)] =
			zdev->ap_dev->pendingq_count +
			zdev->ap_dev->requestq_count;
		spin_unlock(&zdev->ap_dev->lock);
	}
	spin_unlock_bh(&zcrypt_device_lock);
}

static void zcrypt_perdev_reqcnt(int reqcnt[AP_DEVICES])
{
	struct zcrypt_device *zdev;

	memset(reqcnt, 0, sizeof(int) * AP_DEVICES);
	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		spin_lock(&zdev->ap_dev->lock);
		reqcnt[AP_QID_DEVICE(zdev->ap_dev->qid)] =
			zdev->ap_dev->total_request_count;
		spin_unlock(&zdev->ap_dev->lock);
	}
	spin_unlock_bh(&zcrypt_device_lock);
}

static int zcrypt_pendingq_count(void)
{
	struct zcrypt_device *zdev;
	int pendingq_count = 0;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		spin_lock(&zdev->ap_dev->lock);
		pendingq_count += zdev->ap_dev->pendingq_count;
		spin_unlock(&zdev->ap_dev->lock);
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return pendingq_count;
}

static int zcrypt_requestq_count(void)
{
	struct zcrypt_device *zdev;
	int requestq_count = 0;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list) {
		spin_lock(&zdev->ap_dev->lock);
		requestq_count += zdev->ap_dev->requestq_count;
		spin_unlock(&zdev->ap_dev->lock);
	}
	spin_unlock_bh(&zcrypt_device_lock);
	return requestq_count;
}

static int zcrypt_count_type(int type)
{
	struct zcrypt_device *zdev;
	int device_count = 0;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list)
		if (zdev->user_space_type == type)
			device_count++;
	spin_unlock_bh(&zcrypt_device_lock);
	return device_count;
}

/**
 * zcrypt_ica_status(): Old, depracted combi status call.
 *
 * Old, deprecated combi status call.
 */
static long zcrypt_ica_status(struct file *filp, unsigned long arg)
{
	struct ica_z90_status *pstat;
	int ret;

	pstat = kzalloc(sizeof(*pstat), GFP_KERNEL);
	if (!pstat)
		return -ENOMEM;
	pstat->totalcount = zcrypt_device_count;
	pstat->leedslitecount = zcrypt_count_type(ZCRYPT_PCICA);
	pstat->leeds2count = zcrypt_count_type(ZCRYPT_PCICC);
	pstat->requestqWaitCount = zcrypt_requestq_count();
	pstat->pendingqWaitCount = zcrypt_pendingq_count();
	pstat->totalOpenCount = atomic_read(&zcrypt_open_count);
	pstat->cryptoDomain = ap_domain_index;
	zcrypt_status_mask(pstat->status);
	zcrypt_qdepth_mask(pstat->qdepth);
	ret = 0;
	if (copy_to_user((void __user *) arg, pstat, sizeof(*pstat)))
		ret = -EFAULT;
	kfree(pstat);
	return ret;
}

static long zcrypt_unlocked_ioctl(struct file *filp, unsigned int cmd,
				  unsigned long arg)
{
	int rc;

	switch (cmd) {
	case ICARSAMODEXPO: {
		struct ica_rsa_modexpo __user *umex = (void __user *) arg;
		struct ica_rsa_modexpo mex;
		if (copy_from_user(&mex, umex, sizeof(mex)))
			return -EFAULT;
		do {
			rc = zcrypt_rsa_modexpo(&mex);
		} while (rc == -EAGAIN);
		if (rc)
			return rc;
		return put_user(mex.outputdatalength, &umex->outputdatalength);
	}
	case ICARSACRT: {
		struct ica_rsa_modexpo_crt __user *ucrt = (void __user *) arg;
		struct ica_rsa_modexpo_crt crt;
		if (copy_from_user(&crt, ucrt, sizeof(crt)))
			return -EFAULT;
		do {
			rc = zcrypt_rsa_crt(&crt);
		} while (rc == -EAGAIN);
		if (rc)
			return rc;
		return put_user(crt.outputdatalength, &ucrt->outputdatalength);
	}
	case ZSECSENDCPRB: {
		struct ica_xcRB __user *uxcRB = (void __user *) arg;
		struct ica_xcRB xcRB;
		if (copy_from_user(&xcRB, uxcRB, sizeof(xcRB)))
			return -EFAULT;
		do {
			rc = zcrypt_send_cprb(&xcRB);
		} while (rc == -EAGAIN);
		if (copy_to_user(uxcRB, &xcRB, sizeof(xcRB)))
			return -EFAULT;
		return rc;
	}
	case Z90STAT_STATUS_MASK: {
		char status[AP_DEVICES];
		zcrypt_status_mask(status);
		if (copy_to_user((char __user *) arg, status,
				 sizeof(char) * AP_DEVICES))
			return -EFAULT;
		return 0;
	}
	case Z90STAT_QDEPTH_MASK: {
		char qdepth[AP_DEVICES];
		zcrypt_qdepth_mask(qdepth);
		if (copy_to_user((char __user *) arg, qdepth,
				 sizeof(char) * AP_DEVICES))
			return -EFAULT;
		return 0;
	}
	case Z90STAT_PERDEV_REQCNT: {
		int reqcnt[AP_DEVICES];
		zcrypt_perdev_reqcnt(reqcnt);
		if (copy_to_user((int __user *) arg, reqcnt,
				 sizeof(int) * AP_DEVICES))
			return -EFAULT;
		return 0;
	}
	case Z90STAT_REQUESTQ_COUNT:
		return put_user(zcrypt_requestq_count(), (int __user *) arg);
	case Z90STAT_PENDINGQ_COUNT:
		return put_user(zcrypt_pendingq_count(), (int __user *) arg);
	case Z90STAT_TOTALOPEN_COUNT:
		return put_user(atomic_read(&zcrypt_open_count),
				(int __user *) arg);
	case Z90STAT_DOMAIN_INDEX:
		return put_user(ap_domain_index, (int __user *) arg);
	/*
	 * Deprecated ioctls. Don't add another device count ioctl,
	 * you can count them yourself in the user space with the
	 * output of the Z90STAT_STATUS_MASK ioctl.
	 */
	case ICAZ90STATUS:
		return zcrypt_ica_status(filp, arg);
	case Z90STAT_TOTALCOUNT:
		return put_user(zcrypt_device_count, (int __user *) arg);
	case Z90STAT_PCICACOUNT:
		return put_user(zcrypt_count_type(ZCRYPT_PCICA),
				(int __user *) arg);
	case Z90STAT_PCICCCOUNT:
		return put_user(zcrypt_count_type(ZCRYPT_PCICC),
				(int __user *) arg);
	case Z90STAT_PCIXCCMCL2COUNT:
		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2),
				(int __user *) arg);
	case Z90STAT_PCIXCCMCL3COUNT:
		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
				(int __user *) arg);
	case Z90STAT_PCIXCCCOUNT:
		return put_user(zcrypt_count_type(ZCRYPT_PCIXCC_MCL2) +
				zcrypt_count_type(ZCRYPT_PCIXCC_MCL3),
				(int __user *) arg);
	case Z90STAT_CEX2CCOUNT:
		return put_user(zcrypt_count_type(ZCRYPT_CEX2C),
				(int __user *) arg);
	case Z90STAT_CEX2ACOUNT:
		return put_user(zcrypt_count_type(ZCRYPT_CEX2A),
				(int __user *) arg);
	default:
		/* unknown ioctl number */
		return -ENOIOCTLCMD;
	}
}

#ifdef CONFIG_COMPAT
/*
 * ioctl32 conversion routines
 */
struct compat_ica_rsa_modexpo {
	compat_uptr_t	inputdata;
	unsigned int	inputdatalength;
	compat_uptr_t	outputdata;
	unsigned int	outputdatalength;
	compat_uptr_t	b_key;
	compat_uptr_t	n_modulus;
};

static long trans_modexpo32(struct file *filp, unsigned int cmd,
			    unsigned long arg)
{
	struct compat_ica_rsa_modexpo __user *umex32 = compat_ptr(arg);
	struct compat_ica_rsa_modexpo mex32;
	struct ica_rsa_modexpo mex64;
	long rc;

	if (copy_from_user(&mex32, umex32, sizeof(mex32)))
		return -EFAULT;
	mex64.inputdata = compat_ptr(mex32.inputdata);
	mex64.inputdatalength = mex32.inputdatalength;
	mex64.outputdata = compat_ptr(mex32.outputdata);
	mex64.outputdatalength = mex32.outputdatalength;
	mex64.b_key = compat_ptr(mex32.b_key);
	mex64.n_modulus = compat_ptr(mex32.n_modulus);
	do {
		rc = zcrypt_rsa_modexpo(&mex64);
	} while (rc == -EAGAIN);
	if (!rc)
		rc = put_user(mex64.outputdatalength,
			      &umex32->outputdatalength);
	return rc;
}

struct compat_ica_rsa_modexpo_crt {
	compat_uptr_t	inputdata;
	unsigned int	inputdatalength;
	compat_uptr_t	outputdata;
	unsigned int	outputdatalength;
	compat_uptr_t	bp_key;
	compat_uptr_t	bq_key;
	compat_uptr_t	np_prime;
	compat_uptr_t	nq_prime;
	compat_uptr_t	u_mult_inv;
};

static long trans_modexpo_crt32(struct file *filp, unsigned int cmd,
				unsigned long arg)
{
	struct compat_ica_rsa_modexpo_crt __user *ucrt32 = compat_ptr(arg);
	struct compat_ica_rsa_modexpo_crt crt32;
	struct ica_rsa_modexpo_crt crt64;
	long rc;

	if (copy_from_user(&crt32, ucrt32, sizeof(crt32)))
		return -EFAULT;
	crt64.inputdata = compat_ptr(crt32.inputdata);
	crt64.inputdatalength = crt32.inputdatalength;
	crt64.outputdata=  compat_ptr(crt32.outputdata);
	crt64.outputdatalength = crt32.outputdatalength;
	crt64.bp_key = compat_ptr(crt32.bp_key);
	crt64.bq_key = compat_ptr(crt32.bq_key);
	crt64.np_prime = compat_ptr(crt32.np_prime);
	crt64.nq_prime = compat_ptr(crt32.nq_prime);
	crt64.u_mult_inv = compat_ptr(crt32.u_mult_inv);
	do {
		rc = zcrypt_rsa_crt(&crt64);
	} while (rc == -EAGAIN);
	if (!rc)
		rc = put_user(crt64.outputdatalength,
			      &ucrt32->outputdatalength);
	return rc;
}

struct compat_ica_xcRB {
	unsigned short	agent_ID;
	unsigned int	user_defined;
	unsigned short	request_ID;
	unsigned int	request_control_blk_length;
	unsigned char	padding1[16 - sizeof (compat_uptr_t)];
	compat_uptr_t	request_control_blk_addr;
	unsigned int	request_data_length;
	char		padding2[16 - sizeof (compat_uptr_t)];
	compat_uptr_t	request_data_address;
	unsigned int	reply_control_blk_length;
	char		padding3[16 - sizeof (compat_uptr_t)];
	compat_uptr_t	reply_control_blk_addr;
	unsigned int	reply_data_length;
	char		padding4[16 - sizeof (compat_uptr_t)];
	compat_uptr_t	reply_data_addr;
	unsigned short	priority_window;
	unsigned int	status;
} __attribute__((packed));

static long trans_xcRB32(struct file *filp, unsigned int cmd,
			 unsigned long arg)
{
	struct compat_ica_xcRB __user *uxcRB32 = compat_ptr(arg);
	struct compat_ica_xcRB xcRB32;
	struct ica_xcRB xcRB64;
	long rc;

	if (copy_from_user(&xcRB32, uxcRB32, sizeof(xcRB32)))
		return -EFAULT;
	xcRB64.agent_ID = xcRB32.agent_ID;
	xcRB64.user_defined = xcRB32.user_defined;
	xcRB64.request_ID = xcRB32.request_ID;
	xcRB64.request_control_blk_length =
		xcRB32.request_control_blk_length;
	xcRB64.request_control_blk_addr =
		compat_ptr(xcRB32.request_control_blk_addr);
	xcRB64.request_data_length =
		xcRB32.request_data_length;
	xcRB64.request_data_address =
		compat_ptr(xcRB32.request_data_address);
	xcRB64.reply_control_blk_length =
		xcRB32.reply_control_blk_length;
	xcRB64.reply_control_blk_addr =
		compat_ptr(xcRB32.reply_control_blk_addr);
	xcRB64.reply_data_length = xcRB32.reply_data_length;
	xcRB64.reply_data_addr =
		compat_ptr(xcRB32.reply_data_addr);
	xcRB64.priority_window = xcRB32.priority_window;
	xcRB64.status = xcRB32.status;
	do {
		rc = zcrypt_send_cprb(&xcRB64);
	} while (rc == -EAGAIN);
	xcRB32.reply_control_blk_length = xcRB64.reply_control_blk_length;
	xcRB32.reply_data_length = xcRB64.reply_data_length;
	xcRB32.status = xcRB64.status;
	if (copy_to_user(uxcRB32, &xcRB32, sizeof(xcRB32)))
			return -EFAULT;
	return rc;
}

static long zcrypt_compat_ioctl(struct file *filp, unsigned int cmd,
			 unsigned long arg)
{
	if (cmd == ICARSAMODEXPO)
		return trans_modexpo32(filp, cmd, arg);
	if (cmd == ICARSACRT)
		return trans_modexpo_crt32(filp, cmd, arg);
	if (cmd == ZSECSENDCPRB)
		return trans_xcRB32(filp, cmd, arg);
	return zcrypt_unlocked_ioctl(filp, cmd, arg);
}
#endif

/*
 * Misc device file operations.
 */
static const struct file_operations zcrypt_fops = {
	.owner		= THIS_MODULE,
	.read		= zcrypt_read,
	.write		= zcrypt_write,
	.unlocked_ioctl	= zcrypt_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= zcrypt_compat_ioctl,
#endif
	.open		= zcrypt_open,
	.release	= zcrypt_release
};

/*
 * Misc device.
 */
static struct miscdevice zcrypt_misc_device = {
	.minor	    = MISC_DYNAMIC_MINOR,
	.name	    = "z90crypt",
	.fops	    = &zcrypt_fops,
};

/*
 * Deprecated /proc entry support.
 */
static struct proc_dir_entry *zcrypt_entry;

static int sprintcl(unsigned char *outaddr, unsigned char *addr,
		    unsigned int len)
{
	int hl, i;

	hl = 0;
	for (i = 0; i < len; i++)
		hl += sprintf(outaddr+hl, "%01x", (unsigned int) addr[i]);
	hl += sprintf(outaddr+hl, " ");
	return hl;
}

static int sprintrw(unsigned char *outaddr, unsigned char *addr,
		    unsigned int len)
{
	int hl, inl, c, cx;

	hl = sprintf(outaddr, "	   ");
	inl = 0;
	for (c = 0; c < (len / 16); c++) {
		hl += sprintcl(outaddr+hl, addr+inl, 16);
		inl += 16;
	}
	cx = len%16;
	if (cx) {
		hl += sprintcl(outaddr+hl, addr+inl, cx);
		inl += cx;
	}
	hl += sprintf(outaddr+hl, "\n");
	return hl;
}

static int sprinthx(unsigned char *title, unsigned char *outaddr,
		    unsigned char *addr, unsigned int len)
{
	int hl, inl, r, rx;

	hl = sprintf(outaddr, "\n%s\n", title);
	inl = 0;
	for (r = 0; r < (len / 64); r++) {
		hl += sprintrw(outaddr+hl, addr+inl, 64);
		inl += 64;
	}
	rx = len % 64;
	if (rx) {
		hl += sprintrw(outaddr+hl, addr+inl, rx);
		inl += rx;
	}
	hl += sprintf(outaddr+hl, "\n");
	return hl;
}

static int sprinthx4(unsigned char *title, unsigned char *outaddr,
		     unsigned int *array, unsigned int len)
{
	int hl, r;

	hl = sprintf(outaddr, "\n%s\n", title);
	for (r = 0; r < len; r++) {
		if ((r % 8) == 0)
			hl += sprintf(outaddr+hl, "    ");
		hl += sprintf(outaddr+hl, "%08X ", array[r]);
		if ((r % 8) == 7)
			hl += sprintf(outaddr+hl, "\n");
	}
	hl += sprintf(outaddr+hl, "\n");
	return hl;
}

static int zcrypt_status_read(char *resp_buff, char **start, off_t offset,
			      int count, int *eof, void *data)
{
	unsigned char *workarea;
	int len;

	len = 0;

	/* resp_buff is a page. Use the right half for a work area */
	workarea = resp_buff + 2000;
	len += sprintf(resp_buff + len, "\nzcrypt version: %d.%d.%d\n",
		ZCRYPT_VERSION, ZCRYPT_RELEASE, ZCRYPT_VARIANT);
	len += sprintf(resp_buff + len, "Cryptographic domain: %d\n",
		       ap_domain_index);
	len += sprintf(resp_buff + len, "Total device count: %d\n",
		       zcrypt_device_count);
	len += sprintf(resp_buff + len, "PCICA count: %d\n",
		       zcrypt_count_type(ZCRYPT_PCICA));
	len += sprintf(resp_buff + len, "PCICC count: %d\n",
		       zcrypt_count_type(ZCRYPT_PCICC));
	len += sprintf(resp_buff + len, "PCIXCC MCL2 count: %d\n",
		       zcrypt_count_type(ZCRYPT_PCIXCC_MCL2));
	len += sprintf(resp_buff + len, "PCIXCC MCL3 count: %d\n",
		       zcrypt_count_type(ZCRYPT_PCIXCC_MCL3));
	len += sprintf(resp_buff + len, "CEX2C count: %d\n",
		       zcrypt_count_type(ZCRYPT_CEX2C));
	len += sprintf(resp_buff + len, "CEX2A count: %d\n",
		       zcrypt_count_type(ZCRYPT_CEX2A));
	len += sprintf(resp_buff + len, "requestq count: %d\n",
		       zcrypt_requestq_count());
	len += sprintf(resp_buff + len, "pendingq count: %d\n",
		       zcrypt_pendingq_count());
	len += sprintf(resp_buff + len, "Total open handles: %d\n\n",
		       atomic_read(&zcrypt_open_count));
	zcrypt_status_mask(workarea);
	len += sprinthx("Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
			"4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A",
			resp_buff+len, workarea, AP_DEVICES);
	zcrypt_qdepth_mask(workarea);
	len += sprinthx("Waiting work element counts",
			resp_buff+len, workarea, AP_DEVICES);
	zcrypt_perdev_reqcnt((int *) workarea);
	len += sprinthx4("Per-device successfully completed request counts",
			 resp_buff+len,(unsigned int *) workarea, AP_DEVICES);
	*eof = 1;
	memset((void *) workarea, 0x00, AP_DEVICES * sizeof(unsigned int));
	return len;
}

static void zcrypt_disable_card(int index)
{
	struct zcrypt_device *zdev;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list)
		if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
			zdev->online = 0;
			ap_flush_queue(zdev->ap_dev);
			break;
		}
	spin_unlock_bh(&zcrypt_device_lock);
}

static void zcrypt_enable_card(int index)
{
	struct zcrypt_device *zdev;

	spin_lock_bh(&zcrypt_device_lock);
	list_for_each_entry(zdev, &zcrypt_device_list, list)
		if (AP_QID_DEVICE(zdev->ap_dev->qid) == index) {
			zdev->online = 1;
			break;
		}
	spin_unlock_bh(&zcrypt_device_lock);
}

static int zcrypt_status_write(struct file *file, const char __user *buffer,
			       unsigned long count, void *data)
{
	unsigned char *lbuf, *ptr;
	unsigned long local_count;
	int j;

	if (count <= 0)
		return 0;

#define LBUFSIZE 1200UL
	lbuf = kmalloc(LBUFSIZE, GFP_KERNEL);
	if (!lbuf)
		return 0;

	local_count = min(LBUFSIZE - 1, count);
	if (copy_from_user(lbuf, buffer, local_count) != 0) {
		kfree(lbuf);
		return -EFAULT;
	}
	lbuf[local_count] = '\0';

	ptr = strstr(lbuf, "Online devices");
	if (!ptr)
		goto out;
	ptr = strstr(ptr, "\n");
	if (!ptr)
		goto out;
	ptr++;

	if (strstr(ptr, "Waiting work element counts") == NULL)
		goto out;

	for (j = 0; j < 64 && *ptr; ptr++) {
		/*
		 * '0' for no device, '1' for PCICA, '2' for PCICC,
		 * '3' for PCIXCC_MCL2, '4' for PCIXCC_MCL3,
		 * '5' for CEX2C and '6' for CEX2A'
		 */
		if (*ptr >= '0' && *ptr <= '6')
			j++;
		else if (*ptr == 'd' || *ptr == 'D')
			zcrypt_disable_card(j++);
		else if (*ptr == 'e' || *ptr == 'E')
			zcrypt_enable_card(j++);
		else if (*ptr != ' ' && *ptr != '\t')
			break;
	}
out:
	kfree(lbuf);
	return count;
}

static int zcrypt_rng_device_count;
static u32 *zcrypt_rng_buffer;
static int zcrypt_rng_buffer_index;
static DEFINE_MUTEX(zcrypt_rng_mutex);

static int zcrypt_rng_data_read(struct hwrng *rng, u32 *data)
{
	int rc;

	/*
	 * We don't need locking here because the RNG API guarantees serialized
	 * read method calls.
	 */
	if (zcrypt_rng_buffer_index == 0) {
		rc = zcrypt_rng((char *) zcrypt_rng_buffer);
		if (rc < 0)
			return -EIO;
		zcrypt_rng_buffer_index = rc / sizeof *data;
	}
	*data = zcrypt_rng_buffer[--zcrypt_rng_buffer_index];
	return sizeof *data;
}

static struct hwrng zcrypt_rng_dev = {
	.name		= "zcrypt",
	.data_read	= zcrypt_rng_data_read,
};

static int zcrypt_rng_device_add(void)
{
	int rc = 0;

	mutex_lock(&zcrypt_rng_mutex);
	if (zcrypt_rng_device_count == 0) {
		zcrypt_rng_buffer = (u32 *) get_zeroed_page(GFP_KERNEL);
		if (!zcrypt_rng_buffer) {
			rc = -ENOMEM;
			goto out;
		}
		zcrypt_rng_buffer_index = 0;
		rc = hwrng_register(&zcrypt_rng_dev);
		if (rc)
			goto out_free;
		zcrypt_rng_device_count = 1;
	} else
		zcrypt_rng_device_count++;
	mutex_unlock(&zcrypt_rng_mutex);
	return 0;

out_free:
	free_page((unsigned long) zcrypt_rng_buffer);
out:
	mutex_unlock(&zcrypt_rng_mutex);
	return rc;
}

static void zcrypt_rng_device_remove(void)
{
	mutex_lock(&zcrypt_rng_mutex);
	zcrypt_rng_device_count--;
	if (zcrypt_rng_device_count == 0) {
		hwrng_unregister(&zcrypt_rng_dev);
		free_page((unsigned long) zcrypt_rng_buffer);
	}
	mutex_unlock(&zcrypt_rng_mutex);
}

/**
 * zcrypt_api_init(): Module initialization.
 *
 * The module initialization code.
 */
int __init zcrypt_api_init(void)
{
	int rc;

	/* Register the request sprayer. */
	rc = misc_register(&zcrypt_misc_device);
	if (rc < 0)
		goto out;

	/* Set up the proc file system */
	zcrypt_entry = create_proc_entry("driver/z90crypt", 0644, NULL);
	if (!zcrypt_entry) {
		rc = -ENOMEM;
		goto out_misc;
	}
	zcrypt_entry->data = NULL;
	zcrypt_entry->read_proc = zcrypt_status_read;
	zcrypt_entry->write_proc = zcrypt_status_write;

	return 0;

out_misc:
	misc_deregister(&zcrypt_misc_device);
out:
	return rc;
}

/**
 * zcrypt_api_exit(): Module termination.
 *
 * The module termination code.
 */
void zcrypt_api_exit(void)
{
	remove_proc_entry("driver/z90crypt", NULL);
	misc_deregister(&zcrypt_misc_device);
}

#ifndef CONFIG_ZCRYPT_MONOLITHIC
module_init(zcrypt_api_init);
module_exit(zcrypt_api_exit);
#endif