summaryrefslogtreecommitdiffstats
path: root/drivers/media/v4l2-core/v4l2-subdev.c
blob: 5c27bac772ea4330f6e25f5bde6dbc9fd58bf218 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * V4L2 sub-device
 *
 * Copyright (C) 2010 Nokia Corporation
 *
 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	    Sakari Ailus <sakari.ailus@iki.fi>
 */

#include <linux/ioctl.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/export.h>
#include <linux/version.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>

#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
	struct v4l2_subdev_state *state;
	static struct lock_class_key key;

	state = __v4l2_subdev_state_alloc(sd, "fh->state->lock", &key);
	if (IS_ERR(state))
		return PTR_ERR(state);

	fh->state = state;

	return 0;
}

static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
	__v4l2_subdev_state_free(fh->state);
	fh->state = NULL;
}

static int subdev_open(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	struct v4l2_subdev_fh *subdev_fh;
	int ret;

	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
	if (subdev_fh == NULL)
		return -ENOMEM;

	ret = subdev_fh_init(subdev_fh, sd);
	if (ret) {
		kfree(subdev_fh);
		return ret;
	}

	v4l2_fh_init(&subdev_fh->vfh, vdev);
	v4l2_fh_add(&subdev_fh->vfh);
	file->private_data = &subdev_fh->vfh;

	if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
		struct module *owner;

		owner = sd->entity.graph_obj.mdev->dev->driver->owner;
		if (!try_module_get(owner)) {
			ret = -EBUSY;
			goto err;
		}
		subdev_fh->owner = owner;
	}

	if (sd->internal_ops && sd->internal_ops->open) {
		ret = sd->internal_ops->open(sd, subdev_fh);
		if (ret < 0)
			goto err;
	}

	return 0;

err:
	module_put(subdev_fh->owner);
	v4l2_fh_del(&subdev_fh->vfh);
	v4l2_fh_exit(&subdev_fh->vfh);
	subdev_fh_free(subdev_fh);
	kfree(subdev_fh);

	return ret;
}

static int subdev_close(struct file *file)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	struct v4l2_fh *vfh = file->private_data;
	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);

	if (sd->internal_ops && sd->internal_ops->close)
		sd->internal_ops->close(sd, subdev_fh);
	module_put(subdev_fh->owner);
	v4l2_fh_del(vfh);
	v4l2_fh_exit(vfh);
	subdev_fh_free(subdev_fh);
	kfree(subdev_fh);
	file->private_data = NULL;

	return 0;
}
#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static int subdev_open(struct file *file)
{
	return -ENODEV;
}

static int subdev_close(struct file *file)
{
	return -ENODEV;
}
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

static inline int check_which(u32 which)
{
	if (which != V4L2_SUBDEV_FORMAT_TRY &&
	    which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	return 0;
}

static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
{
#if defined(CONFIG_MEDIA_CONTROLLER)
	if (sd->entity.num_pads) {
		if (pad >= sd->entity.num_pads)
			return -EINVAL;
		return 0;
	}
#endif
	/* allow pad 0 on subdevices not registered as media entities */
	if (pad > 0)
		return -EINVAL;
	return 0;
}

static int check_state_pads(u32 which, struct v4l2_subdev_state *state)
{
	if (which == V4L2_SUBDEV_FORMAT_TRY && (!state || !state->pads))
		return -EINVAL;

	return 0;
}

static inline int check_format(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *state,
			       struct v4l2_subdev_format *format)
{
	if (!format)
		return -EINVAL;

	return check_which(format->which) ? : check_pad(sd, format->pad) ? :
	       check_state_pads(format->which, state);
}

static int call_get_fmt(struct v4l2_subdev *sd,
			struct v4l2_subdev_state *state,
			struct v4l2_subdev_format *format)
{
	return check_format(sd, state, format) ? :
	       sd->ops->pad->get_fmt(sd, state, format);
}

static int call_set_fmt(struct v4l2_subdev *sd,
			struct v4l2_subdev_state *state,
			struct v4l2_subdev_format *format)
{
	return check_format(sd, state, format) ? :
	       sd->ops->pad->set_fmt(sd, state, format);
}

static int call_enum_mbus_code(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *state,
			       struct v4l2_subdev_mbus_code_enum *code)
{
	if (!code)
		return -EINVAL;

	return check_which(code->which) ? : check_pad(sd, code->pad) ? :
	       check_state_pads(code->which, state) ? :
	       sd->ops->pad->enum_mbus_code(sd, state, code);
}

static int call_enum_frame_size(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				struct v4l2_subdev_frame_size_enum *fse)
{
	if (!fse)
		return -EINVAL;

	return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
	       check_state_pads(fse->which, state) ? :
	       sd->ops->pad->enum_frame_size(sd, state, fse);
}

static inline int check_frame_interval(struct v4l2_subdev *sd,
				       struct v4l2_subdev_frame_interval *fi)
{
	if (!fi)
		return -EINVAL;

	return check_pad(sd, fi->pad);
}

static int call_g_frame_interval(struct v4l2_subdev *sd,
				 struct v4l2_subdev_frame_interval *fi)
{
	return check_frame_interval(sd, fi) ? :
	       sd->ops->video->g_frame_interval(sd, fi);
}

static int call_s_frame_interval(struct v4l2_subdev *sd,
				 struct v4l2_subdev_frame_interval *fi)
{
	return check_frame_interval(sd, fi) ? :
	       sd->ops->video->s_frame_interval(sd, fi);
}

static int call_enum_frame_interval(struct v4l2_subdev *sd,
				    struct v4l2_subdev_state *state,
				    struct v4l2_subdev_frame_interval_enum *fie)
{
	if (!fie)
		return -EINVAL;

	return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
	       check_state_pads(fie->which, state) ? :
	       sd->ops->pad->enum_frame_interval(sd, state, fie);
}

static inline int check_selection(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *state,
				  struct v4l2_subdev_selection *sel)
{
	if (!sel)
		return -EINVAL;

	return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
	       check_state_pads(sel->which, state);
}

static int call_get_selection(struct v4l2_subdev *sd,
			      struct v4l2_subdev_state *state,
			      struct v4l2_subdev_selection *sel)
{
	return check_selection(sd, state, sel) ? :
	       sd->ops->pad->get_selection(sd, state, sel);
}

static int call_set_selection(struct v4l2_subdev *sd,
			      struct v4l2_subdev_state *state,
			      struct v4l2_subdev_selection *sel)
{
	return check_selection(sd, state, sel) ? :
	       sd->ops->pad->set_selection(sd, state, sel);
}

static inline int check_edid(struct v4l2_subdev *sd,
			     struct v4l2_subdev_edid *edid)
{
	if (!edid)
		return -EINVAL;

	if (edid->blocks && edid->edid == NULL)
		return -EINVAL;

	return check_pad(sd, edid->pad);
}

static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
{
	return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
}

static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
{
	return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
}

static int call_dv_timings_cap(struct v4l2_subdev *sd,
			       struct v4l2_dv_timings_cap *cap)
{
	if (!cap)
		return -EINVAL;

	return check_pad(sd, cap->pad) ? :
	       sd->ops->pad->dv_timings_cap(sd, cap);
}

static int call_enum_dv_timings(struct v4l2_subdev *sd,
				struct v4l2_enum_dv_timings *dvt)
{
	if (!dvt)
		return -EINVAL;

	return check_pad(sd, dvt->pad) ? :
	       sd->ops->pad->enum_dv_timings(sd, dvt);
}

static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
				struct v4l2_mbus_config *config)
{
	return check_pad(sd, pad) ? :
	       sd->ops->pad->get_mbus_config(sd, pad, config);
}

#ifdef CONFIG_MEDIA_CONTROLLER
/*
 * Create state-management wrapper for pad ops dealing with subdev state. The
 * wrapper handles the case where the caller does not provide the called
 * subdev's state. This should be removed when all the callers are fixed.
 */
#define DEFINE_STATE_WRAPPER(f, arg_type)                                  \
	static int call_##f##_state(struct v4l2_subdev *sd,                \
				    struct v4l2_subdev_state *_state,      \
				    arg_type *arg)                         \
	{                                                                  \
		struct v4l2_subdev_state *state = _state;                  \
		int ret;                                                   \
		if (!_state)                                               \
			state = v4l2_subdev_lock_and_get_active_state(sd); \
		ret = call_##f(sd, state, arg);                            \
		if (!_state && state)                                      \
			v4l2_subdev_unlock_state(state);                   \
		return ret;                                                \
	}

#else /* CONFIG_MEDIA_CONTROLLER */

#define DEFINE_STATE_WRAPPER(f, arg_type)                            \
	static int call_##f##_state(struct v4l2_subdev *sd,          \
				    struct v4l2_subdev_state *state, \
				    arg_type *arg)                   \
	{                                                            \
		return call_##f(sd, state, arg);                     \
	}

#endif /* CONFIG_MEDIA_CONTROLLER */

DEFINE_STATE_WRAPPER(get_fmt, struct v4l2_subdev_format);
DEFINE_STATE_WRAPPER(set_fmt, struct v4l2_subdev_format);
DEFINE_STATE_WRAPPER(enum_mbus_code, struct v4l2_subdev_mbus_code_enum);
DEFINE_STATE_WRAPPER(enum_frame_size, struct v4l2_subdev_frame_size_enum);
DEFINE_STATE_WRAPPER(enum_frame_interval, struct v4l2_subdev_frame_interval_enum);
DEFINE_STATE_WRAPPER(get_selection, struct v4l2_subdev_selection);
DEFINE_STATE_WRAPPER(set_selection, struct v4l2_subdev_selection);

static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
	.get_fmt		= call_get_fmt_state,
	.set_fmt		= call_set_fmt_state,
	.enum_mbus_code		= call_enum_mbus_code_state,
	.enum_frame_size	= call_enum_frame_size_state,
	.enum_frame_interval	= call_enum_frame_interval_state,
	.get_selection		= call_get_selection_state,
	.set_selection		= call_set_selection_state,
	.get_edid		= call_get_edid,
	.set_edid		= call_set_edid,
	.dv_timings_cap		= call_dv_timings_cap,
	.enum_dv_timings	= call_enum_dv_timings,
	.get_mbus_config	= call_get_mbus_config,
};

static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
	.g_frame_interval	= call_g_frame_interval,
	.s_frame_interval	= call_s_frame_interval,
};

const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
	.pad	= &v4l2_subdev_call_pad_wrappers,
	.video	= &v4l2_subdev_call_video_wrappers,
};
EXPORT_SYMBOL(v4l2_subdev_call_wrappers);

#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)

static struct v4l2_subdev_state *
subdev_ioctl_get_state(struct v4l2_subdev *sd, struct v4l2_subdev_fh *subdev_fh,
		       unsigned int cmd, void *arg)
{
	u32 which;

	switch (cmd) {
	default:
		return NULL;
	case VIDIOC_SUBDEV_G_FMT:
	case VIDIOC_SUBDEV_S_FMT:
		which = ((struct v4l2_subdev_format *)arg)->which;
		break;
	case VIDIOC_SUBDEV_G_CROP:
	case VIDIOC_SUBDEV_S_CROP:
		which = ((struct v4l2_subdev_crop *)arg)->which;
		break;
	case VIDIOC_SUBDEV_ENUM_MBUS_CODE:
		which = ((struct v4l2_subdev_mbus_code_enum *)arg)->which;
		break;
	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE:
		which = ((struct v4l2_subdev_frame_size_enum *)arg)->which;
		break;
	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL:
		which = ((struct v4l2_subdev_frame_interval_enum *)arg)->which;
		break;
	case VIDIOC_SUBDEV_G_SELECTION:
	case VIDIOC_SUBDEV_S_SELECTION:
		which = ((struct v4l2_subdev_selection *)arg)->which;
		break;
	}

	return which == V4L2_SUBDEV_FORMAT_TRY ?
			     subdev_fh->state :
			     v4l2_subdev_get_unlocked_active_state(sd);
}

static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
			    struct v4l2_subdev_state *state)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	struct v4l2_fh *vfh = file->private_data;
	bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
	int rval;

	switch (cmd) {
	case VIDIOC_SUBDEV_QUERYCAP: {
		struct v4l2_subdev_capability *cap = arg;

		memset(cap->reserved, 0, sizeof(cap->reserved));
		cap->version = LINUX_VERSION_CODE;
		cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;

		return 0;
	}

	case VIDIOC_QUERYCTRL:
		/*
		 * TODO: this really should be folded into v4l2_queryctrl (this
		 * currently returns -EINVAL for NULL control handlers).
		 * However, v4l2_queryctrl() is still called directly by
		 * drivers as well and until that has been addressed I believe
		 * it is safer to do the check here. The same is true for the
		 * other control ioctls below.
		 */
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_queryctrl(vfh->ctrl_handler, arg);

	case VIDIOC_QUERY_EXT_CTRL:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);

	case VIDIOC_QUERYMENU:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_querymenu(vfh->ctrl_handler, arg);

	case VIDIOC_G_CTRL:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_g_ctrl(vfh->ctrl_handler, arg);

	case VIDIOC_S_CTRL:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);

	case VIDIOC_G_EXT_CTRLS:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_g_ext_ctrls(vfh->ctrl_handler,
					vdev, sd->v4l2_dev->mdev, arg);

	case VIDIOC_S_EXT_CTRLS:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
					vdev, sd->v4l2_dev->mdev, arg);

	case VIDIOC_TRY_EXT_CTRLS:
		if (!vfh->ctrl_handler)
			return -ENOTTY;
		return v4l2_try_ext_ctrls(vfh->ctrl_handler,
					  vdev, sd->v4l2_dev->mdev, arg);

	case VIDIOC_DQEVENT:
		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
			return -ENOIOCTLCMD;

		return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);

	case VIDIOC_SUBSCRIBE_EVENT:
		return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);

	case VIDIOC_UNSUBSCRIBE_EVENT:
		return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);

#ifdef CONFIG_VIDEO_ADV_DEBUG
	case VIDIOC_DBG_G_REGISTER:
	{
		struct v4l2_dbg_register *p = arg;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		return v4l2_subdev_call(sd, core, g_register, p);
	}
	case VIDIOC_DBG_S_REGISTER:
	{
		struct v4l2_dbg_register *p = arg;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		return v4l2_subdev_call(sd, core, s_register, p);
	}
	case VIDIOC_DBG_G_CHIP_INFO:
	{
		struct v4l2_dbg_chip_info *p = arg;

		if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
			return -EINVAL;
		if (sd->ops->core && sd->ops->core->s_register)
			p->flags |= V4L2_CHIP_FL_WRITABLE;
		if (sd->ops->core && sd->ops->core->g_register)
			p->flags |= V4L2_CHIP_FL_READABLE;
		strscpy(p->name, sd->name, sizeof(p->name));
		return 0;
	}
#endif

	case VIDIOC_LOG_STATUS: {
		int ret;

		pr_info("%s: =================  START STATUS  =================\n",
			sd->name);
		ret = v4l2_subdev_call(sd, core, log_status);
		pr_info("%s: ==================  END STATUS  ==================\n",
			sd->name);
		return ret;
	}

	case VIDIOC_SUBDEV_G_FMT: {
		struct v4l2_subdev_format *format = arg;

		memset(format->reserved, 0, sizeof(format->reserved));
		memset(format->format.reserved, 0, sizeof(format->format.reserved));
		return v4l2_subdev_call(sd, pad, get_fmt, state, format);
	}

	case VIDIOC_SUBDEV_S_FMT: {
		struct v4l2_subdev_format *format = arg;

		if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
			return -EPERM;

		memset(format->reserved, 0, sizeof(format->reserved));
		memset(format->format.reserved, 0, sizeof(format->format.reserved));
		return v4l2_subdev_call(sd, pad, set_fmt, state, format);
	}

	case VIDIOC_SUBDEV_G_CROP: {
		struct v4l2_subdev_crop *crop = arg;
		struct v4l2_subdev_selection sel;

		memset(crop->reserved, 0, sizeof(crop->reserved));
		memset(&sel, 0, sizeof(sel));
		sel.which = crop->which;
		sel.pad = crop->pad;
		sel.target = V4L2_SEL_TGT_CROP;

		rval = v4l2_subdev_call(
			sd, pad, get_selection, state, &sel);

		crop->rect = sel.r;

		return rval;
	}

	case VIDIOC_SUBDEV_S_CROP: {
		struct v4l2_subdev_crop *crop = arg;
		struct v4l2_subdev_selection sel;

		if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
			return -EPERM;

		memset(crop->reserved, 0, sizeof(crop->reserved));
		memset(&sel, 0, sizeof(sel));
		sel.which = crop->which;
		sel.pad = crop->pad;
		sel.target = V4L2_SEL_TGT_CROP;
		sel.r = crop->rect;

		rval = v4l2_subdev_call(
			sd, pad, set_selection, state, &sel);

		crop->rect = sel.r;

		return rval;
	}

	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
		struct v4l2_subdev_mbus_code_enum *code = arg;

		memset(code->reserved, 0, sizeof(code->reserved));
		return v4l2_subdev_call(sd, pad, enum_mbus_code, state,
					code);
	}

	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
		struct v4l2_subdev_frame_size_enum *fse = arg;

		memset(fse->reserved, 0, sizeof(fse->reserved));
		return v4l2_subdev_call(sd, pad, enum_frame_size, state,
					fse);
	}

	case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
		struct v4l2_subdev_frame_interval *fi = arg;

		memset(fi->reserved, 0, sizeof(fi->reserved));
		return v4l2_subdev_call(sd, video, g_frame_interval, arg);
	}

	case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
		struct v4l2_subdev_frame_interval *fi = arg;

		if (ro_subdev)
			return -EPERM;

		memset(fi->reserved, 0, sizeof(fi->reserved));
		return v4l2_subdev_call(sd, video, s_frame_interval, arg);
	}

	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
		struct v4l2_subdev_frame_interval_enum *fie = arg;

		memset(fie->reserved, 0, sizeof(fie->reserved));
		return v4l2_subdev_call(sd, pad, enum_frame_interval, state,
					fie);
	}

	case VIDIOC_SUBDEV_G_SELECTION: {
		struct v4l2_subdev_selection *sel = arg;

		memset(sel->reserved, 0, sizeof(sel->reserved));
		return v4l2_subdev_call(
			sd, pad, get_selection, state, sel);
	}

	case VIDIOC_SUBDEV_S_SELECTION: {
		struct v4l2_subdev_selection *sel = arg;

		if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
			return -EPERM;

		memset(sel->reserved, 0, sizeof(sel->reserved));
		return v4l2_subdev_call(
			sd, pad, set_selection, state, sel);
	}

	case VIDIOC_G_EDID: {
		struct v4l2_subdev_edid *edid = arg;

		return v4l2_subdev_call(sd, pad, get_edid, edid);
	}

	case VIDIOC_S_EDID: {
		struct v4l2_subdev_edid *edid = arg;

		return v4l2_subdev_call(sd, pad, set_edid, edid);
	}

	case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
		struct v4l2_dv_timings_cap *cap = arg;

		return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
	}

	case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
		struct v4l2_enum_dv_timings *dvt = arg;

		return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
	}

	case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
		return v4l2_subdev_call(sd, video, query_dv_timings, arg);

	case VIDIOC_SUBDEV_G_DV_TIMINGS:
		return v4l2_subdev_call(sd, video, g_dv_timings, arg);

	case VIDIOC_SUBDEV_S_DV_TIMINGS:
		if (ro_subdev)
			return -EPERM;

		return v4l2_subdev_call(sd, video, s_dv_timings, arg);

	case VIDIOC_SUBDEV_G_STD:
		return v4l2_subdev_call(sd, video, g_std, arg);

	case VIDIOC_SUBDEV_S_STD: {
		v4l2_std_id *std = arg;

		if (ro_subdev)
			return -EPERM;

		return v4l2_subdev_call(sd, video, s_std, *std);
	}

	case VIDIOC_SUBDEV_ENUMSTD: {
		struct v4l2_standard *p = arg;
		v4l2_std_id id;

		if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
			return -EINVAL;

		return v4l_video_std_enumstd(p, id);
	}

	case VIDIOC_SUBDEV_QUERYSTD:
		return v4l2_subdev_call(sd, video, querystd, arg);

	default:
		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
	}

	return 0;
}

static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
{
	struct video_device *vdev = video_devdata(file);
	struct mutex *lock = vdev->lock;
	long ret = -ENODEV;

	if (lock && mutex_lock_interruptible(lock))
		return -ERESTARTSYS;

	if (video_is_registered(vdev)) {
		struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
		struct v4l2_fh *vfh = file->private_data;
		struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
		struct v4l2_subdev_state *state;

		state = subdev_ioctl_get_state(sd, subdev_fh, cmd, arg);

		if (state)
			v4l2_subdev_lock_state(state);

		ret = subdev_do_ioctl(file, cmd, arg, state);

		if (state)
			v4l2_subdev_unlock_state(state);
	}

	if (lock)
		mutex_unlock(lock);
	return ret;
}

static long subdev_ioctl(struct file *file, unsigned int cmd,
	unsigned long arg)
{
	return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
}

#ifdef CONFIG_COMPAT
static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
	unsigned long arg)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);

	return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
}
#endif

#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
static long subdev_ioctl(struct file *file, unsigned int cmd,
			 unsigned long arg)
{
	return -ENODEV;
}

#ifdef CONFIG_COMPAT
static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
				  unsigned long arg)
{
	return -ENODEV;
}
#endif
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

static __poll_t subdev_poll(struct file *file, poll_table *wait)
{
	struct video_device *vdev = video_devdata(file);
	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
	struct v4l2_fh *fh = file->private_data;

	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
		return EPOLLERR;

	poll_wait(file, &fh->wait, wait);

	if (v4l2_event_pending(fh))
		return EPOLLPRI;

	return 0;
}

const struct v4l2_file_operations v4l2_subdev_fops = {
	.owner = THIS_MODULE,
	.open = subdev_open,
	.unlocked_ioctl = subdev_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl32 = subdev_compat_ioctl32,
#endif
	.release = subdev_close,
	.poll = subdev_poll,
};

#ifdef CONFIG_MEDIA_CONTROLLER

int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
				      struct fwnode_endpoint *endpoint)
{
	struct fwnode_handle *fwnode;
	struct v4l2_subdev *sd;

	if (!is_media_entity_v4l2_subdev(entity))
		return -EINVAL;

	sd = media_entity_to_v4l2_subdev(entity);

	fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
	fwnode_handle_put(fwnode);

	if (dev_fwnode(sd->dev) == fwnode)
		return endpoint->port;

	return -ENXIO;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);

int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
				      struct media_link *link,
				      struct v4l2_subdev_format *source_fmt,
				      struct v4l2_subdev_format *sink_fmt)
{
	bool pass = true;

	/* The width, height and code must match. */
	if (source_fmt->format.width != sink_fmt->format.width) {
		dev_dbg(sd->entity.graph_obj.mdev->dev,
			"%s: width does not match (source %u, sink %u)\n",
			__func__,
			source_fmt->format.width, sink_fmt->format.width);
		pass = false;
	}

	if (source_fmt->format.height != sink_fmt->format.height) {
		dev_dbg(sd->entity.graph_obj.mdev->dev,
			"%s: height does not match (source %u, sink %u)\n",
			__func__,
			source_fmt->format.height, sink_fmt->format.height);
		pass = false;
	}

	if (source_fmt->format.code != sink_fmt->format.code) {
		dev_dbg(sd->entity.graph_obj.mdev->dev,
			"%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
			__func__,
			source_fmt->format.code, sink_fmt->format.code);
		pass = false;
	}

	/* The field order must match, or the sink field order must be NONE
	 * to support interlaced hardware connected to bridges that support
	 * progressive formats only.
	 */
	if (source_fmt->format.field != sink_fmt->format.field &&
	    sink_fmt->format.field != V4L2_FIELD_NONE) {
		dev_dbg(sd->entity.graph_obj.mdev->dev,
			"%s: field does not match (source %u, sink %u)\n",
			__func__,
			source_fmt->format.field, sink_fmt->format.field);
		pass = false;
	}

	if (pass)
		return 0;

	dev_dbg(sd->entity.graph_obj.mdev->dev,
		"%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
		link->source->entity->name, link->source->index,
		link->sink->entity->name, link->sink->index);

	return -EPIPE;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);

static int
v4l2_subdev_link_validate_get_format(struct media_pad *pad,
				     struct v4l2_subdev_format *fmt)
{
	if (is_media_entity_v4l2_subdev(pad->entity)) {
		struct v4l2_subdev *sd =
			media_entity_to_v4l2_subdev(pad->entity);

		fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
		fmt->pad = pad->index;
		return v4l2_subdev_call_state_active(sd, pad, get_fmt, fmt);
	}

	WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
	     "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
	     pad->entity->function, pad->entity->name);

	return -EINVAL;
}

int v4l2_subdev_link_validate(struct media_link *link)
{
	struct v4l2_subdev *sink;
	struct v4l2_subdev_format sink_fmt, source_fmt;
	int rval;

	rval = v4l2_subdev_link_validate_get_format(
		link->source, &source_fmt);
	if (rval < 0)
		return 0;

	rval = v4l2_subdev_link_validate_get_format(
		link->sink, &sink_fmt);
	if (rval < 0)
		return 0;

	sink = media_entity_to_v4l2_subdev(link->sink->entity);

	rval = v4l2_subdev_call(sink, pad, link_validate, link,
				&source_fmt, &sink_fmt);
	if (rval != -ENOIOCTLCMD)
		return rval;

	return v4l2_subdev_link_validate_default(
		sink, link, &source_fmt, &sink_fmt);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);

struct v4l2_subdev_state *
__v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
			  struct lock_class_key *lock_key)
{
	struct v4l2_subdev_state *state;
	int ret;

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

	__mutex_init(&state->_lock, lock_name, lock_key);
	if (sd->state_lock)
		state->lock = sd->state_lock;
	else
		state->lock = &state->_lock;

	if (sd->entity.num_pads) {
		state->pads = kvcalloc(sd->entity.num_pads,
				       sizeof(*state->pads), GFP_KERNEL);
		if (!state->pads) {
			ret = -ENOMEM;
			goto err;
		}
	}

	/*
	 * There can be no race at this point, but we lock the state anyway to
	 * satisfy lockdep checks.
	 */
	v4l2_subdev_lock_state(state);
	ret = v4l2_subdev_call(sd, pad, init_cfg, state);
	v4l2_subdev_unlock_state(state);

	if (ret < 0 && ret != -ENOIOCTLCMD)
		goto err;

	return state;

err:
	if (state && state->pads)
		kvfree(state->pads);

	kfree(state);

	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_alloc);

void __v4l2_subdev_state_free(struct v4l2_subdev_state *state)
{
	if (!state)
		return;

	mutex_destroy(&state->_lock);

	kvfree(state->pads);
	kfree(state);
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_state_free);

int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
				struct lock_class_key *key)
{
	struct v4l2_subdev_state *state;

	state = __v4l2_subdev_state_alloc(sd, name, key);
	if (IS_ERR(state))
		return PTR_ERR(state);

	sd->active_state = state;

	return 0;
}
EXPORT_SYMBOL_GPL(__v4l2_subdev_init_finalize);

void v4l2_subdev_cleanup(struct v4l2_subdev *sd)
{
	__v4l2_subdev_state_free(sd->active_state);
	sd->active_state = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);

#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)

int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
			struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *fmt;

	if (format->pad >= sd->entity.num_pads)
		return -EINVAL;

	fmt = v4l2_subdev_get_pad_format(sd, state, format->pad);
	if (!fmt)
		return -EINVAL;

	format->format = *fmt;

	return 0;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);

#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */

#endif /* CONFIG_MEDIA_CONTROLLER */

void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
{
	INIT_LIST_HEAD(&sd->list);
	BUG_ON(!ops);
	sd->ops = ops;
	sd->v4l2_dev = NULL;
	sd->flags = 0;
	sd->name[0] = '\0';
	sd->grp_id = 0;
	sd->dev_priv = NULL;
	sd->host_priv = NULL;
#if defined(CONFIG_MEDIA_CONTROLLER)
	sd->entity.name = sd->name;
	sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
	sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
#endif
}
EXPORT_SYMBOL(v4l2_subdev_init);

void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
			      const struct v4l2_event *ev)
{
	v4l2_event_queue(sd->devnode, ev);
	v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);