summaryrefslogtreecommitdiff
path: root/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
blob: 8c07400bd280dea5d2e66e2759658c423bcd3866 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
 *	Separated from fs stuff by Arnd Bergmann <arnd@arndb.de>
 *
 * Copyright (C) 1997-2000  Jakub Jelinek  (jakub@redhat.com)
 * Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
 * Copyright (C) 2001,2002  Andi Kleen, SuSE Labs
 * Copyright (C) 2003       Pavel Machek (pavel@ucw.cz)
 * Copyright (C) 2005       Philippe De Muyter (phdm@macqel.be)
 * Copyright (C) 2008       Hans Verkuil <hverkuil@xs4all.nl>
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * ioctls.
 */

#include <linux/compat.h>
#include <linux/module.h>
#include <linux/videodev2.h>
#include <linux/v4l2-subdev.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-ioctl.h>

/*
 * Per-ioctl data copy handlers.
 *
 * Those come in pairs, with a get_v4l2_foo() and a put_v4l2_foo() routine,
 * where "v4l2_foo" is the name of the V4L2 struct.
 *
 * They basically get two __user pointers, one with a 32-bits struct that
 * came from the userspace call and a 64-bits struct, also allocated as
 * userspace, but filled internally by do_video_ioctl().
 *
 * For ioctls that have pointers inside it, the functions will also
 * receive an ancillary buffer with extra space, used to pass extra
 * data to the routine.
 */

struct v4l2_window32 {
	struct v4l2_rect        w;
	__u32			field;	/* enum v4l2_field */
	__u32			chromakey;
	compat_caddr_t		clips; /* always NULL */
	__u32			clipcount; /* always 0 */
	compat_caddr_t		bitmap; /* always NULL */
	__u8                    global_alpha;
};

static int get_v4l2_window32(struct v4l2_window *p64,
			     struct v4l2_window32 __user *p32)
{
	struct v4l2_window32 w32;

	if (copy_from_user(&w32, p32, sizeof(w32)))
		return -EFAULT;

	*p64 = (struct v4l2_window) {
		.w		= w32.w,
		.field		= w32.field,
		.chromakey	= w32.chromakey,
		.clips		= NULL,
		.clipcount	= 0,
		.bitmap		= NULL,
		.global_alpha	= w32.global_alpha,
	};

	return 0;
}

static int put_v4l2_window32(struct v4l2_window *p64,
			     struct v4l2_window32 __user *p32)
{
	struct v4l2_window32 w32;

	memset(&w32, 0, sizeof(w32));
	w32 = (struct v4l2_window32) {
		.w		= p64->w,
		.field		= p64->field,
		.chromakey	= p64->chromakey,
		.clips		= 0,
		.clipcount	= 0,
		.bitmap		= 0,
		.global_alpha	= p64->global_alpha,
	};

	if (copy_to_user(p32, &w32, sizeof(w32)))
		return -EFAULT;

	return 0;
}

struct v4l2_format32 {
	__u32	type;	/* enum v4l2_buf_type */
	union {
		struct v4l2_pix_format	pix;
		struct v4l2_pix_format_mplane	pix_mp;
		struct v4l2_window32	win;
		struct v4l2_vbi_format	vbi;
		struct v4l2_sliced_vbi_format	sliced;
		struct v4l2_sdr_format	sdr;
		struct v4l2_meta_format	meta;
		__u8	raw_data[200];        /* user-defined */
	} fmt;
};

/**
 * struct v4l2_create_buffers32 - VIDIOC_CREATE_BUFS32 argument
 * @index:	on return, index of the first created buffer
 * @count:	entry: number of requested buffers,
 *		return: number of created buffers
 * @memory:	buffer memory type
 * @format:	frame format, for which buffers are requested
 * @capabilities: capabilities of this buffer type.
 * @flags:	additional buffer management attributes (ignored unless the
 *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and
 *		configured for MMAP streaming I/O).
 * @max_num_buffers: if V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set
 *		this field indicate the maximum possible number of buffers
 *		for this queue.
 * @reserved:	future extensions
 */
struct v4l2_create_buffers32 {
	__u32			index;
	__u32			count;
	__u32			memory;	/* enum v4l2_memory */
	struct v4l2_format32	format;
	__u32			capabilities;
	__u32			flags;
	__u32			max_num_buffers;
	__u32			reserved[5];
};

static int get_v4l2_format32(struct v4l2_format *p64,
			     struct v4l2_format32 __user *p32)
{
	if (get_user(p64->type, &p32->type))
		return -EFAULT;

	switch (p64->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		return copy_from_user(&p64->fmt.pix, &p32->fmt.pix,
				      sizeof(p64->fmt.pix)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
		return copy_from_user(&p64->fmt.pix_mp, &p32->fmt.pix_mp,
				      sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
		return get_v4l2_window32(&p64->fmt.win, &p32->fmt.win);
	case V4L2_BUF_TYPE_VBI_CAPTURE:
	case V4L2_BUF_TYPE_VBI_OUTPUT:
		return copy_from_user(&p64->fmt.vbi, &p32->fmt.vbi,
				      sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
		return copy_from_user(&p64->fmt.sliced, &p32->fmt.sliced,
				      sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_SDR_CAPTURE:
	case V4L2_BUF_TYPE_SDR_OUTPUT:
		return copy_from_user(&p64->fmt.sdr, &p32->fmt.sdr,
				      sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_META_CAPTURE:
	case V4L2_BUF_TYPE_META_OUTPUT:
		return copy_from_user(&p64->fmt.meta, &p32->fmt.meta,
				      sizeof(p64->fmt.meta)) ? -EFAULT : 0;
	default:
		return -EINVAL;
	}
}

static int get_v4l2_create32(struct v4l2_create_buffers *p64,
			     struct v4l2_create_buffers32 __user *p32)
{
	if (copy_from_user(p64, p32,
			   offsetof(struct v4l2_create_buffers32, format)))
		return -EFAULT;
	if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags)))
		return -EFAULT;
	if (copy_from_user(&p64->max_num_buffers, &p32->max_num_buffers,
			   sizeof(p32->max_num_buffers)))
		return -EFAULT;
	return get_v4l2_format32(&p64->format, &p32->format);
}

static int put_v4l2_format32(struct v4l2_format *p64,
			     struct v4l2_format32 __user *p32)
{
	switch (p64->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		return copy_to_user(&p32->fmt.pix, &p64->fmt.pix,
				    sizeof(p64->fmt.pix)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
		return copy_to_user(&p32->fmt.pix_mp, &p64->fmt.pix_mp,
				    sizeof(p64->fmt.pix_mp)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
		return put_v4l2_window32(&p64->fmt.win, &p32->fmt.win);
	case V4L2_BUF_TYPE_VBI_CAPTURE:
	case V4L2_BUF_TYPE_VBI_OUTPUT:
		return copy_to_user(&p32->fmt.vbi, &p64->fmt.vbi,
				    sizeof(p64->fmt.vbi)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
		return copy_to_user(&p32->fmt.sliced, &p64->fmt.sliced,
				    sizeof(p64->fmt.sliced)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_SDR_CAPTURE:
	case V4L2_BUF_TYPE_SDR_OUTPUT:
		return copy_to_user(&p32->fmt.sdr, &p64->fmt.sdr,
				    sizeof(p64->fmt.sdr)) ? -EFAULT : 0;
	case V4L2_BUF_TYPE_META_CAPTURE:
	case V4L2_BUF_TYPE_META_OUTPUT:
		return copy_to_user(&p32->fmt.meta, &p64->fmt.meta,
				    sizeof(p64->fmt.meta)) ? -EFAULT : 0;
	default:
		return -EINVAL;
	}
}

static int put_v4l2_create32(struct v4l2_create_buffers *p64,
			     struct v4l2_create_buffers32 __user *p32)
{
	if (copy_to_user(p32, p64,
			 offsetof(struct v4l2_create_buffers32, format)) ||
	    put_user(p64->capabilities, &p32->capabilities) ||
	    put_user(p64->flags, &p32->flags) ||
	    put_user(p64->max_num_buffers, &p32->max_num_buffers) ||
	    copy_to_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
		return -EFAULT;
	return put_v4l2_format32(&p64->format, &p32->format);
}

struct v4l2_standard32 {
	__u32		     index;
	compat_u64	     id;
	__u8		     name[24];
	struct v4l2_fract    frameperiod; /* Frames, not fields */
	__u32		     framelines;
	__u32		     reserved[4];
};

static int get_v4l2_standard32(struct v4l2_standard *p64,
			       struct v4l2_standard32 __user *p32)
{
	/* other fields are not set by the user, nor used by the driver */
	return get_user(p64->index, &p32->index);
}

static int put_v4l2_standard32(struct v4l2_standard *p64,
			       struct v4l2_standard32 __user *p32)
{
	if (put_user(p64->index, &p32->index) ||
	    put_user(p64->id, &p32->id) ||
	    copy_to_user(p32->name, p64->name, sizeof(p32->name)) ||
	    copy_to_user(&p32->frameperiod, &p64->frameperiod,
			 sizeof(p32->frameperiod)) ||
	    put_user(p64->framelines, &p32->framelines) ||
	    copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
		return -EFAULT;
	return 0;
}

struct v4l2_plane32 {
	__u32			bytesused;
	__u32			length;
	union {
		__u32		mem_offset;
		compat_long_t	userptr;
		__s32		fd;
	} m;
	__u32			data_offset;
	__u32			reserved[11];
};

/*
 * This is correct for all architectures including i386, but not x32,
 * which has different alignment requirements for timestamp
 */
struct v4l2_buffer32 {
	__u32			index;
	__u32			type;	/* enum v4l2_buf_type */
	__u32			bytesused;
	__u32			flags;
	__u32			field;	/* enum v4l2_field */
	struct {
		compat_s64	tv_sec;
		compat_s64	tv_usec;
	}			timestamp;
	struct v4l2_timecode	timecode;
	__u32			sequence;

	/* memory location */
	__u32			memory;	/* enum v4l2_memory */
	union {
		__u32           offset;
		compat_long_t   userptr;
		compat_caddr_t  planes;
		__s32		fd;
	} m;
	__u32			length;
	__u32			reserved2;
	__s32			request_fd;
};

#ifdef CONFIG_COMPAT_32BIT_TIME
struct v4l2_buffer32_time32 {
	__u32			index;
	__u32			type;	/* enum v4l2_buf_type */
	__u32			bytesused;
	__u32			flags;
	__u32			field;	/* enum v4l2_field */
	struct old_timeval32	timestamp;
	struct v4l2_timecode	timecode;
	__u32			sequence;

	/* memory location */
	__u32			memory;	/* enum v4l2_memory */
	union {
		__u32           offset;
		compat_long_t   userptr;
		compat_caddr_t  planes;
		__s32		fd;
	} m;
	__u32			length;
	__u32			reserved2;
	__s32			request_fd;
};
#endif

static int get_v4l2_plane32(struct v4l2_plane *p64,
			    struct v4l2_plane32 __user *p32,
			    enum v4l2_memory memory)
{
	struct v4l2_plane32 plane32;
	typeof(p64->m) m = {};

	if (copy_from_user(&plane32, p32, sizeof(plane32)))
		return -EFAULT;

	switch (memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		m.mem_offset = plane32.m.mem_offset;
		break;
	case V4L2_MEMORY_USERPTR:
		m.userptr = (unsigned long)compat_ptr(plane32.m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		m.fd = plane32.m.fd;
		break;
	}

	memset(p64, 0, sizeof(*p64));
	*p64 = (struct v4l2_plane) {
		.bytesused	= plane32.bytesused,
		.length		= plane32.length,
		.m		= m,
		.data_offset	= plane32.data_offset,
	};

	return 0;
}

static int put_v4l2_plane32(struct v4l2_plane *p64,
			    struct v4l2_plane32 __user *p32,
			    enum v4l2_memory memory)
{
	struct v4l2_plane32 plane32;

	memset(&plane32, 0, sizeof(plane32));
	plane32 = (struct v4l2_plane32) {
		.bytesused	= p64->bytesused,
		.length		= p64->length,
		.data_offset	= p64->data_offset,
	};

	switch (memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		plane32.m.mem_offset = p64->m.mem_offset;
		break;
	case V4L2_MEMORY_USERPTR:
		plane32.m.userptr = (uintptr_t)(p64->m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		plane32.m.fd = p64->m.fd;
		break;
	}

	if (copy_to_user(p32, &plane32, sizeof(plane32)))
		return -EFAULT;

	return 0;
}

static int get_v4l2_buffer32(struct v4l2_buffer *vb,
			     struct v4l2_buffer32 __user *arg)
{
	struct v4l2_buffer32 vb32;

	if (copy_from_user(&vb32, arg, sizeof(vb32)))
		return -EFAULT;

	memset(vb, 0, sizeof(*vb));
	*vb = (struct v4l2_buffer) {
		.index		= vb32.index,
		.type		= vb32.type,
		.bytesused	= vb32.bytesused,
		.flags		= vb32.flags,
		.field		= vb32.field,
		.timestamp.tv_sec	= vb32.timestamp.tv_sec,
		.timestamp.tv_usec	= vb32.timestamp.tv_usec,
		.timecode	= vb32.timecode,
		.sequence	= vb32.sequence,
		.memory		= vb32.memory,
		.m.offset	= vb32.m.offset,
		.length		= vb32.length,
		.request_fd	= vb32.request_fd,
	};

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		vb->m.offset = vb32.m.offset;
		break;
	case V4L2_MEMORY_USERPTR:
		vb->m.userptr = (unsigned long)compat_ptr(vb32.m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		vb->m.fd = vb32.m.fd;
		break;
	}

	if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
		vb->m.planes = (void __force *)
				compat_ptr(vb32.m.planes);

	return 0;
}

#ifdef CONFIG_COMPAT_32BIT_TIME
static int get_v4l2_buffer32_time32(struct v4l2_buffer *vb,
				    struct v4l2_buffer32_time32 __user *arg)
{
	struct v4l2_buffer32_time32 vb32;

	if (copy_from_user(&vb32, arg, sizeof(vb32)))
		return -EFAULT;

	*vb = (struct v4l2_buffer) {
		.index		= vb32.index,
		.type		= vb32.type,
		.bytesused	= vb32.bytesused,
		.flags		= vb32.flags,
		.field		= vb32.field,
		.timestamp.tv_sec	= vb32.timestamp.tv_sec,
		.timestamp.tv_usec	= vb32.timestamp.tv_usec,
		.timecode	= vb32.timecode,
		.sequence	= vb32.sequence,
		.memory		= vb32.memory,
		.m.offset	= vb32.m.offset,
		.length		= vb32.length,
		.request_fd	= vb32.request_fd,
	};
	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		vb->m.offset = vb32.m.offset;
		break;
	case V4L2_MEMORY_USERPTR:
		vb->m.userptr = (unsigned long)compat_ptr(vb32.m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		vb->m.fd = vb32.m.fd;
		break;
	}

	if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
		vb->m.planes = (void __force *)
				compat_ptr(vb32.m.planes);

	return 0;
}
#endif

static int put_v4l2_buffer32(struct v4l2_buffer *vb,
			     struct v4l2_buffer32 __user *arg)
{
	struct v4l2_buffer32 vb32;

	memset(&vb32, 0, sizeof(vb32));
	vb32 = (struct v4l2_buffer32) {
		.index		= vb->index,
		.type		= vb->type,
		.bytesused	= vb->bytesused,
		.flags		= vb->flags,
		.field		= vb->field,
		.timestamp.tv_sec	= vb->timestamp.tv_sec,
		.timestamp.tv_usec	= vb->timestamp.tv_usec,
		.timecode	= vb->timecode,
		.sequence	= vb->sequence,
		.memory		= vb->memory,
		.m.offset	= vb->m.offset,
		.length		= vb->length,
		.request_fd	= vb->request_fd,
	};

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		vb32.m.offset = vb->m.offset;
		break;
	case V4L2_MEMORY_USERPTR:
		vb32.m.userptr = (uintptr_t)(vb->m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		vb32.m.fd = vb->m.fd;
		break;
	}

	if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
		vb32.m.planes = (uintptr_t)vb->m.planes;

	if (copy_to_user(arg, &vb32, sizeof(vb32)))
		return -EFAULT;

	return 0;
}

#ifdef CONFIG_COMPAT_32BIT_TIME
static int put_v4l2_buffer32_time32(struct v4l2_buffer *vb,
				    struct v4l2_buffer32_time32 __user *arg)
{
	struct v4l2_buffer32_time32 vb32;

	memset(&vb32, 0, sizeof(vb32));
	vb32 = (struct v4l2_buffer32_time32) {
		.index		= vb->index,
		.type		= vb->type,
		.bytesused	= vb->bytesused,
		.flags		= vb->flags,
		.field		= vb->field,
		.timestamp.tv_sec	= vb->timestamp.tv_sec,
		.timestamp.tv_usec	= vb->timestamp.tv_usec,
		.timecode	= vb->timecode,
		.sequence	= vb->sequence,
		.memory		= vb->memory,
		.m.offset	= vb->m.offset,
		.length		= vb->length,
		.request_fd	= vb->request_fd,
	};
	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
	case V4L2_MEMORY_OVERLAY:
		vb32.m.offset = vb->m.offset;
		break;
	case V4L2_MEMORY_USERPTR:
		vb32.m.userptr = (uintptr_t)(vb->m.userptr);
		break;
	case V4L2_MEMORY_DMABUF:
		vb32.m.fd = vb->m.fd;
		break;
	}

	if (V4L2_TYPE_IS_MULTIPLANAR(vb->type))
		vb32.m.planes = (uintptr_t)vb->m.planes;

	if (copy_to_user(arg, &vb32, sizeof(vb32)))
		return -EFAULT;

	return 0;
}
#endif

struct v4l2_framebuffer32 {
	__u32			capability;
	__u32			flags;
	compat_caddr_t		base;
	struct {
		__u32		width;
		__u32		height;
		__u32		pixelformat;
		__u32		field;
		__u32		bytesperline;
		__u32		sizeimage;
		__u32		colorspace;
		__u32		priv;
	} fmt;
};

static int get_v4l2_framebuffer32(struct v4l2_framebuffer *p64,
				  struct v4l2_framebuffer32 __user *p32)
{
	if (get_user(p64->capability, &p32->capability) ||
	    get_user(p64->flags, &p32->flags) ||
	    copy_from_user(&p64->fmt, &p32->fmt, sizeof(p64->fmt)))
		return -EFAULT;
	p64->base = NULL;

	return 0;
}

static int put_v4l2_framebuffer32(struct v4l2_framebuffer *p64,
				  struct v4l2_framebuffer32 __user *p32)
{
	if (put_user((uintptr_t)p64->base, &p32->base) ||
	    put_user(p64->capability, &p32->capability) ||
	    put_user(p64->flags, &p32->flags) ||
	    copy_to_user(&p32->fmt, &p64->fmt, sizeof(p64->fmt)))
		return -EFAULT;

	return 0;
}

struct v4l2_input32 {
	__u32	     index;		/*  Which input */
	__u8	     name[32];		/*  Label */
	__u32	     type;		/*  Type of input */
	__u32	     audioset;		/*  Associated audios (bitfield) */
	__u32        tuner;             /*  Associated tuner */
	compat_u64   std;
	__u32	     status;
	__u32	     capabilities;
	__u32	     reserved[3];
};

/*
 * The 64-bit v4l2_input struct has extra padding at the end of the struct.
 * Otherwise it is identical to the 32-bit version.
 */
static inline int get_v4l2_input32(struct v4l2_input *p64,
				   struct v4l2_input32 __user *p32)
{
	if (copy_from_user(p64, p32, sizeof(*p32)))
		return -EFAULT;
	return 0;
}

static inline int put_v4l2_input32(struct v4l2_input *p64,
				   struct v4l2_input32 __user *p32)
{
	if (copy_to_user(p32, p64, sizeof(*p32)))
		return -EFAULT;
	return 0;
}

struct v4l2_ext_controls32 {
	__u32 which;
	__u32 count;
	__u32 error_idx;
	__s32 request_fd;
	__u32 reserved[1];
	compat_caddr_t controls; /* actually struct v4l2_ext_control32 * */
};

struct v4l2_ext_control32 {
	__u32 id;
	__u32 size;
	__u32 reserved2[1];
	union {
		__s32 value;
		__s64 value64;
		compat_caddr_t string; /* actually char * */
	};
} __attribute__ ((packed));

/* Return true if this control is a pointer type. */
static inline bool ctrl_is_pointer(struct file *file, u32 id)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_fh *fh = NULL;
	struct v4l2_ctrl_handler *hdl = NULL;
	struct v4l2_query_ext_ctrl qec = { id };
	const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;

	if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
		fh = file->private_data;

	if (fh && fh->ctrl_handler)
		hdl = fh->ctrl_handler;
	else if (vdev->ctrl_handler)
		hdl = vdev->ctrl_handler;

	if (hdl) {
		struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, id);

		return ctrl && ctrl->is_ptr;
	}

	if (!ops || !ops->vidioc_query_ext_ctrl)
		return false;

	return !ops->vidioc_query_ext_ctrl(file, fh, &qec) &&
		(qec.flags & V4L2_CTRL_FLAG_HAS_PAYLOAD);
}

static int get_v4l2_ext_controls32(struct v4l2_ext_controls *p64,
				   struct v4l2_ext_controls32 __user *p32)
{
	struct v4l2_ext_controls32 ec32;

	if (copy_from_user(&ec32, p32, sizeof(ec32)))
		return -EFAULT;

	*p64 = (struct v4l2_ext_controls) {
		.which		= ec32.which,
		.count		= ec32.count,
		.error_idx	= ec32.error_idx,
		.request_fd	= ec32.request_fd,
		.reserved[0]	= ec32.reserved[0],
		.controls	= (void __force *)compat_ptr(ec32.controls),
	};

	return 0;
}

static int put_v4l2_ext_controls32(struct v4l2_ext_controls *p64,
				   struct v4l2_ext_controls32 __user *p32)
{
	struct v4l2_ext_controls32 ec32;

	memset(&ec32, 0, sizeof(ec32));
	ec32 = (struct v4l2_ext_controls32) {
		.which		= p64->which,
		.count		= p64->count,
		.error_idx	= p64->error_idx,
		.request_fd	= p64->request_fd,
		.reserved[0]	= p64->reserved[0],
		.controls	= (uintptr_t)p64->controls,
	};

	if (copy_to_user(p32, &ec32, sizeof(ec32)))
		return -EFAULT;

	return 0;
}

#ifdef CONFIG_X86_64
/*
 * x86 is the only compat architecture with different struct alignment
 * between 32-bit and 64-bit tasks.
 */
struct v4l2_event32 {
	__u32				type;
	union {
		compat_s64		value64;
		__u8			data[64];
	} u;
	__u32				pending;
	__u32				sequence;
	struct {
		compat_s64		tv_sec;
		compat_s64		tv_nsec;
	} timestamp;
	__u32				id;
	__u32				reserved[8];
};

static int put_v4l2_event32(struct v4l2_event *p64,
			    struct v4l2_event32 __user *p32)
{
	if (put_user(p64->type, &p32->type) ||
	    copy_to_user(&p32->u, &p64->u, sizeof(p64->u)) ||
	    put_user(p64->pending, &p32->pending) ||
	    put_user(p64->sequence, &p32->sequence) ||
	    put_user(p64->timestamp.tv_sec, &p32->timestamp.tv_sec) ||
	    put_user(p64->timestamp.tv_nsec, &p32->timestamp.tv_nsec) ||
	    put_user(p64->id, &p32->id) ||
	    copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
		return -EFAULT;
	return 0;
}

#endif

#ifdef CONFIG_COMPAT_32BIT_TIME
struct v4l2_event32_time32 {
	__u32				type;
	union {
		compat_s64		value64;
		__u8			data[64];
	} u;
	__u32				pending;
	__u32				sequence;
	struct old_timespec32		timestamp;
	__u32				id;
	__u32				reserved[8];
};

static int put_v4l2_event32_time32(struct v4l2_event *p64,
				   struct v4l2_event32_time32 __user *p32)
{
	if (put_user(p64->type, &p32->type) ||
	    copy_to_user(&p32->u, &p64->u, sizeof(p64->u)) ||
	    put_user(p64->pending, &p32->pending) ||
	    put_user(p64->sequence, &p32->sequence) ||
	    put_user(p64->timestamp.tv_sec, &p32->timestamp.tv_sec) ||
	    put_user(p64->timestamp.tv_nsec, &p32->timestamp.tv_nsec) ||
	    put_user(p64->id, &p32->id) ||
	    copy_to_user(p32->reserved, p64->reserved, sizeof(p32->reserved)))
		return -EFAULT;
	return 0;
}
#endif

struct v4l2_edid32 {
	__u32 pad;
	__u32 start_block;
	__u32 blocks;
	__u32 reserved[5];
	compat_caddr_t edid;
};

static int get_v4l2_edid32(struct v4l2_edid *p64,
			   struct v4l2_edid32 __user *p32)
{
	compat_uptr_t edid;

	if (copy_from_user(p64, p32, offsetof(struct v4l2_edid32, edid)) ||
	    get_user(edid, &p32->edid))
		return -EFAULT;

	p64->edid = (void __force *)compat_ptr(edid);
	return 0;
}

static int put_v4l2_edid32(struct v4l2_edid *p64,
			   struct v4l2_edid32 __user *p32)
{
	if (copy_to_user(p32, p64, offsetof(struct v4l2_edid32, edid)))
		return -EFAULT;
	return 0;
}

/*
 * List of ioctls that require 32-bits/64-bits conversion
 *
 * The V4L2 ioctls that aren't listed there don't have pointer arguments
 * and the struct size is identical for both 32 and 64 bits versions, so
 * they don't need translations.
 */

#define VIDIOC_G_FMT32		_IOWR('V',  4, struct v4l2_format32)
#define VIDIOC_S_FMT32		_IOWR('V',  5, struct v4l2_format32)
#define VIDIOC_QUERYBUF32	_IOWR('V',  9, struct v4l2_buffer32)
#define VIDIOC_G_FBUF32		_IOR ('V', 10, struct v4l2_framebuffer32)
#define VIDIOC_S_FBUF32		_IOW ('V', 11, struct v4l2_framebuffer32)
#define VIDIOC_QBUF32		_IOWR('V', 15, struct v4l2_buffer32)
#define VIDIOC_DQBUF32		_IOWR('V', 17, struct v4l2_buffer32)
#define VIDIOC_ENUMSTD32	_IOWR('V', 25, struct v4l2_standard32)
#define VIDIOC_ENUMINPUT32	_IOWR('V', 26, struct v4l2_input32)
#define VIDIOC_G_EDID32		_IOWR('V', 40, struct v4l2_edid32)
#define VIDIOC_S_EDID32		_IOWR('V', 41, struct v4l2_edid32)
#define VIDIOC_TRY_FMT32	_IOWR('V', 64, struct v4l2_format32)
#define VIDIOC_G_EXT_CTRLS32    _IOWR('V', 71, struct v4l2_ext_controls32)
#define VIDIOC_S_EXT_CTRLS32    _IOWR('V', 72, struct v4l2_ext_controls32)
#define VIDIOC_TRY_EXT_CTRLS32  _IOWR('V', 73, struct v4l2_ext_controls32)
#define	VIDIOC_DQEVENT32	_IOR ('V', 89, struct v4l2_event32)
#define VIDIOC_CREATE_BUFS32	_IOWR('V', 92, struct v4l2_create_buffers32)
#define VIDIOC_PREPARE_BUF32	_IOWR('V', 93, struct v4l2_buffer32)

#ifdef CONFIG_COMPAT_32BIT_TIME
#define VIDIOC_QUERYBUF32_TIME32	_IOWR('V',  9, struct v4l2_buffer32_time32)
#define VIDIOC_QBUF32_TIME32		_IOWR('V', 15, struct v4l2_buffer32_time32)
#define VIDIOC_DQBUF32_TIME32		_IOWR('V', 17, struct v4l2_buffer32_time32)
#define	VIDIOC_DQEVENT32_TIME32		_IOR ('V', 89, struct v4l2_event32_time32)
#define VIDIOC_PREPARE_BUF32_TIME32	_IOWR('V', 93, struct v4l2_buffer32_time32)
#endif

unsigned int v4l2_compat_translate_cmd(unsigned int cmd)
{
	switch (cmd) {
	case VIDIOC_G_FMT32:
		return VIDIOC_G_FMT;
	case VIDIOC_S_FMT32:
		return VIDIOC_S_FMT;
	case VIDIOC_TRY_FMT32:
		return VIDIOC_TRY_FMT;
	case VIDIOC_G_FBUF32:
		return VIDIOC_G_FBUF;
	case VIDIOC_S_FBUF32:
		return VIDIOC_S_FBUF;
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_QUERYBUF32_TIME32:
		return VIDIOC_QUERYBUF;
	case VIDIOC_QBUF32_TIME32:
		return VIDIOC_QBUF;
	case VIDIOC_DQBUF32_TIME32:
		return VIDIOC_DQBUF;
	case VIDIOC_PREPARE_BUF32_TIME32:
		return VIDIOC_PREPARE_BUF;
#endif
	case VIDIOC_QUERYBUF32:
		return VIDIOC_QUERYBUF;
	case VIDIOC_QBUF32:
		return VIDIOC_QBUF;
	case VIDIOC_DQBUF32:
		return VIDIOC_DQBUF;
	case VIDIOC_CREATE_BUFS32:
		return VIDIOC_CREATE_BUFS;
	case VIDIOC_G_EXT_CTRLS32:
		return VIDIOC_G_EXT_CTRLS;
	case VIDIOC_S_EXT_CTRLS32:
		return VIDIOC_S_EXT_CTRLS;
	case VIDIOC_TRY_EXT_CTRLS32:
		return VIDIOC_TRY_EXT_CTRLS;
	case VIDIOC_PREPARE_BUF32:
		return VIDIOC_PREPARE_BUF;
	case VIDIOC_ENUMSTD32:
		return VIDIOC_ENUMSTD;
	case VIDIOC_ENUMINPUT32:
		return VIDIOC_ENUMINPUT;
	case VIDIOC_G_EDID32:
		return VIDIOC_G_EDID;
	case VIDIOC_S_EDID32:
		return VIDIOC_S_EDID;
#ifdef CONFIG_X86_64
	case VIDIOC_DQEVENT32:
		return VIDIOC_DQEVENT;
#endif
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_DQEVENT32_TIME32:
		return VIDIOC_DQEVENT;
#endif
	}
	return cmd;
}

int v4l2_compat_get_user(void __user *arg, void *parg, unsigned int cmd)
{
	switch (cmd) {
	case VIDIOC_G_FMT32:
	case VIDIOC_S_FMT32:
	case VIDIOC_TRY_FMT32:
		return get_v4l2_format32(parg, arg);

	case VIDIOC_S_FBUF32:
		return get_v4l2_framebuffer32(parg, arg);
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_QUERYBUF32_TIME32:
	case VIDIOC_QBUF32_TIME32:
	case VIDIOC_DQBUF32_TIME32:
	case VIDIOC_PREPARE_BUF32_TIME32:
		return get_v4l2_buffer32_time32(parg, arg);
#endif
	case VIDIOC_QUERYBUF32:
	case VIDIOC_QBUF32:
	case VIDIOC_DQBUF32:
	case VIDIOC_PREPARE_BUF32:
		return get_v4l2_buffer32(parg, arg);

	case VIDIOC_G_EXT_CTRLS32:
	case VIDIOC_S_EXT_CTRLS32:
	case VIDIOC_TRY_EXT_CTRLS32:
		return get_v4l2_ext_controls32(parg, arg);

	case VIDIOC_CREATE_BUFS32:
		return get_v4l2_create32(parg, arg);

	case VIDIOC_ENUMSTD32:
		return get_v4l2_standard32(parg, arg);

	case VIDIOC_ENUMINPUT32:
		return get_v4l2_input32(parg, arg);

	case VIDIOC_G_EDID32:
	case VIDIOC_S_EDID32:
		return get_v4l2_edid32(parg, arg);
	}
	return 0;
}

int v4l2_compat_put_user(void __user *arg, void *parg, unsigned int cmd)
{
	switch (cmd) {
	case VIDIOC_G_FMT32:
	case VIDIOC_S_FMT32:
	case VIDIOC_TRY_FMT32:
		return put_v4l2_format32(parg, arg);

	case VIDIOC_G_FBUF32:
		return put_v4l2_framebuffer32(parg, arg);
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_QUERYBUF32_TIME32:
	case VIDIOC_QBUF32_TIME32:
	case VIDIOC_DQBUF32_TIME32:
	case VIDIOC_PREPARE_BUF32_TIME32:
		return put_v4l2_buffer32_time32(parg, arg);
#endif
	case VIDIOC_QUERYBUF32:
	case VIDIOC_QBUF32:
	case VIDIOC_DQBUF32:
	case VIDIOC_PREPARE_BUF32:
		return put_v4l2_buffer32(parg, arg);

	case VIDIOC_G_EXT_CTRLS32:
	case VIDIOC_S_EXT_CTRLS32:
	case VIDIOC_TRY_EXT_CTRLS32:
		return put_v4l2_ext_controls32(parg, arg);

	case VIDIOC_CREATE_BUFS32:
		return put_v4l2_create32(parg, arg);

	case VIDIOC_ENUMSTD32:
		return put_v4l2_standard32(parg, arg);

	case VIDIOC_ENUMINPUT32:
		return put_v4l2_input32(parg, arg);

	case VIDIOC_G_EDID32:
	case VIDIOC_S_EDID32:
		return put_v4l2_edid32(parg, arg);
#ifdef CONFIG_X86_64
	case VIDIOC_DQEVENT32:
		return put_v4l2_event32(parg, arg);
#endif
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_DQEVENT32_TIME32:
		return put_v4l2_event32_time32(parg, arg);
#endif
	}
	return 0;
}

int v4l2_compat_get_array_args(struct file *file, void *mbuf,
			       void __user *user_ptr, size_t array_size,
			       unsigned int cmd, void *arg)
{
	int err = 0;

	memset(mbuf, 0, array_size);

	switch (cmd) {
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_QUERYBUF32_TIME32:
	case VIDIOC_QBUF32_TIME32:
	case VIDIOC_DQBUF32_TIME32:
	case VIDIOC_PREPARE_BUF32_TIME32:
#endif
	case VIDIOC_QUERYBUF32:
	case VIDIOC_QBUF32:
	case VIDIOC_DQBUF32:
	case VIDIOC_PREPARE_BUF32: {
		struct v4l2_buffer *b64 = arg;
		struct v4l2_plane *p64 = mbuf;
		struct v4l2_plane32 __user *p32 = user_ptr;

		if (V4L2_TYPE_IS_MULTIPLANAR(b64->type)) {
			u32 num_planes = b64->length;

			if (num_planes == 0)
				return 0;

			while (num_planes--) {
				err = get_v4l2_plane32(p64, p32, b64->memory);
				if (err)
					return err;
				++p64;
				++p32;
			}
		}
		break;
	}
	case VIDIOC_G_EXT_CTRLS32:
	case VIDIOC_S_EXT_CTRLS32:
	case VIDIOC_TRY_EXT_CTRLS32: {
		struct v4l2_ext_controls *ecs64 = arg;
		struct v4l2_ext_control *ec64 = mbuf;
		struct v4l2_ext_control32 __user *ec32 = user_ptr;
		int n;

		for (n = 0; n < ecs64->count; n++) {
			if (copy_from_user(ec64, ec32, sizeof(*ec32)))
				return -EFAULT;

			if (ctrl_is_pointer(file, ec64->id)) {
				compat_uptr_t p;

				if (get_user(p, &ec32->string))
					return -EFAULT;
				ec64->string = compat_ptr(p);
			}
			ec32++;
			ec64++;
		}
		break;
	}
	default:
		if (copy_from_user(mbuf, user_ptr, array_size))
			err = -EFAULT;
		break;
	}

	return err;
}

int v4l2_compat_put_array_args(struct file *file, void __user *user_ptr,
			       void *mbuf, size_t array_size,
			       unsigned int cmd, void *arg)
{
	int err = 0;

	switch (cmd) {
#ifdef CONFIG_COMPAT_32BIT_TIME
	case VIDIOC_QUERYBUF32_TIME32:
	case VIDIOC_QBUF32_TIME32:
	case VIDIOC_DQBUF32_TIME32:
	case VIDIOC_PREPARE_BUF32_TIME32:
#endif
	case VIDIOC_QUERYBUF32:
	case VIDIOC_QBUF32:
	case VIDIOC_DQBUF32:
	case VIDIOC_PREPARE_BUF32: {
		struct v4l2_buffer *b64 = arg;
		struct v4l2_plane *p64 = mbuf;
		struct v4l2_plane32 __user *p32 = user_ptr;

		if (V4L2_TYPE_IS_MULTIPLANAR(b64->type)) {
			u32 num_planes = b64->length;

			if (num_planes == 0)
				return 0;

			while (num_planes--) {
				err = put_v4l2_plane32(p64, p32, b64->memory);
				if (err)
					return err;
				++p64;
				++p32;
			}
		}
		break;
	}
	case VIDIOC_G_EXT_CTRLS32:
	case VIDIOC_S_EXT_CTRLS32:
	case VIDIOC_TRY_EXT_CTRLS32: {
		struct v4l2_ext_controls *ecs64 = arg;
		struct v4l2_ext_control *ec64 = mbuf;
		struct v4l2_ext_control32 __user *ec32 = user_ptr;
		int n;

		for (n = 0; n < ecs64->count; n++) {
			unsigned int size = sizeof(*ec32);
			/*
			 * Do not modify the pointer when copying a pointer
			 * control.  The contents of the pointer was changed,
			 * not the pointer itself.
			 * The structures are otherwise compatible.
			 */
			if (ctrl_is_pointer(file, ec64->id))
				size -= sizeof(ec32->value64);

			if (copy_to_user(ec32, ec64, size))
				return -EFAULT;

			ec32++;
			ec64++;
		}
		break;
	}
	default:
		if (copy_to_user(user_ptr, mbuf, array_size))
			err = -EFAULT;
		break;
	}

	return err;
}

/**
 * v4l2_compat_ioctl32() - Handles a compat32 ioctl call
 *
 * @file: pointer to &struct file with the file handler
 * @cmd: ioctl to be called
 * @arg: arguments passed from/to the ioctl handler
 *
 * This function is meant to be used as .compat_ioctl fops at v4l2-dev.c
 * in order to deal with 32-bit calls on a 64-bits Kernel.
 *
 * This function calls do_video_ioctl() for non-private V4L2 ioctls.
 * If the function is a private one it calls vdev->fops->compat_ioctl32
 * instead.
 */
long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct video_device *vdev = video_devdata(file);
	long ret = -ENOIOCTLCMD;

	if (!file->f_op->unlocked_ioctl)
		return ret;

	if (!video_is_registered(vdev))
		return -ENODEV;

	if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
		ret = file->f_op->unlocked_ioctl(file, cmd,
					(unsigned long)compat_ptr(arg));
	else if (vdev->fops->compat_ioctl32)
		ret = vdev->fops->compat_ioctl32(file, cmd, arg);

	if (ret == -ENOIOCTLCMD)
		pr_debug("compat_ioctl32: unknown ioctl '%c', dir=%d, #%d (0x%08x)\n",
			 _IOC_TYPE(cmd), _IOC_DIR(cmd), _IOC_NR(cmd), cmd);
	return ret;
}
EXPORT_SYMBOL_GPL(v4l2_compat_ioctl32);