Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
/*
 * Driver for Renesas R-Car VIN
 *
 * Copyright (C) 2016 Renesas Electronics Corp.
 * Copyright (C) 2011-2013 Renesas Solutions Corp.
 * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
 * Copyright (C) 2008 Magnus Damm
 *
 * Based on the soc-camera rcar_vin driver
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/pm_runtime.h>

#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-rect.h>

#include "rcar-vin.h"

#define RVIN_DEFAULT_FORMAT	V4L2_PIX_FMT_YUYV
#define RVIN_MAX_WIDTH		2048
#define RVIN_MAX_HEIGHT		2048

/* -----------------------------------------------------------------------------
 * Format Conversions
 */

static const struct rvin_video_format rvin_formats[] = {
	{
		.fourcc			= V4L2_PIX_FMT_NV16,
		.bpp			= 1,
	},
	{
		.fourcc			= V4L2_PIX_FMT_YUYV,
		.bpp			= 2,
	},
	{
		.fourcc			= V4L2_PIX_FMT_UYVY,
		.bpp			= 2,
	},
	{
		.fourcc			= V4L2_PIX_FMT_RGB565,
		.bpp			= 2,
	},
	{
		.fourcc			= V4L2_PIX_FMT_XRGB555,
		.bpp			= 2,
	},
	{
		.fourcc			= V4L2_PIX_FMT_XBGR32,
		.bpp			= 4,
	},
};

const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(rvin_formats); i++)
		if (rvin_formats[i].fourcc == pixelformat)
			return rvin_formats + i;

	return NULL;
}

static u32 rvin_format_bytesperline(struct v4l2_pix_format *pix)
{
	const struct rvin_video_format *fmt;

	fmt = rvin_format_from_pixel(pix->pixelformat);

	if (WARN_ON(!fmt))
		return -EINVAL;

	return pix->width * fmt->bpp;
}

static u32 rvin_format_sizeimage(struct v4l2_pix_format *pix)
{
	if (pix->pixelformat == V4L2_PIX_FMT_NV16)
		return pix->bytesperline * pix->height * 2;

	return pix->bytesperline * pix->height;
}

/* -----------------------------------------------------------------------------
 * V4L2
 */

static void rvin_reset_crop_compose(struct rvin_dev *vin)
{
	vin->crop.top = vin->crop.left = 0;
	vin->crop.width = vin->source.width;
	vin->crop.height = vin->source.height;

	vin->compose.top = vin->compose.left = 0;
	vin->compose.width = vin->format.width;
	vin->compose.height = vin->format.height;
}

static int rvin_reset_format(struct rvin_dev *vin)
{
	struct v4l2_subdev_format fmt = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	struct v4l2_mbus_framefmt *mf = &fmt.format;
	int ret;

	fmt.pad = vin->src_pad_idx;

	ret = v4l2_subdev_call(vin_to_source(vin), pad, get_fmt, NULL, &fmt);
	if (ret)
		return ret;

	vin->format.width	= mf->width;
	vin->format.height	= mf->height;
	vin->format.colorspace	= mf->colorspace;
	vin->format.field	= mf->field;

	/*
	 * If the subdevice uses ALTERNATE field mode and G_STD is
	 * implemented use the VIN HW to combine the two fields to
	 * one INTERLACED frame. The ALTERNATE field mode can still
	 * be requested in S_FMT and be respected, this is just the
	 * default which is applied at probing or when S_STD is called.
	 */
	if (vin->format.field == V4L2_FIELD_ALTERNATE &&
	    v4l2_subdev_has_op(vin_to_source(vin), video, g_std))
		vin->format.field = V4L2_FIELD_INTERLACED;

	switch (vin->format.field) {
	case V4L2_FIELD_TOP:
	case V4L2_FIELD_BOTTOM:
	case V4L2_FIELD_ALTERNATE:
		vin->format.height /= 2;
		break;
	case V4L2_FIELD_NONE:
	case V4L2_FIELD_INTERLACED_TB:
	case V4L2_FIELD_INTERLACED_BT:
	case V4L2_FIELD_INTERLACED:
		break;
	default:
		vin->format.field = V4L2_FIELD_NONE;
		break;
	}

	rvin_reset_crop_compose(vin);

	return 0;
}

static int __rvin_try_format_source(struct rvin_dev *vin,
				    u32 which,
				    struct v4l2_pix_format *pix,
				    struct rvin_source_fmt *source)
{
	struct v4l2_subdev *sd;
	struct v4l2_subdev_pad_config *pad_cfg;
	struct v4l2_subdev_format format = {
		.which = which,
	};
	enum v4l2_field field;
	int ret;

	sd = vin_to_source(vin);

	v4l2_fill_mbus_format(&format.format, pix, vin->digital.code);

	pad_cfg = v4l2_subdev_alloc_pad_config(sd);
	if (pad_cfg == NULL)
		return -ENOMEM;

	format.pad = vin->src_pad_idx;

	field = pix->field;

	ret = v4l2_subdev_call(sd, pad, set_fmt, pad_cfg, &format);
	if (ret < 0 && ret != -ENOIOCTLCMD)
		goto done;

	v4l2_fill_pix_format(pix, &format.format);

	pix->field = field;

	source->width = pix->width;
	source->height = pix->height;

	vin_dbg(vin, "Source resolution: %ux%u\n", source->width,
		source->height);

done:
	v4l2_subdev_free_pad_config(pad_cfg);
	return ret;
}

static int __rvin_try_format(struct rvin_dev *vin,
			     u32 which,
			     struct v4l2_pix_format *pix,
			     struct rvin_source_fmt *source)
{
	const struct rvin_video_format *info;
	u32 rwidth, rheight, walign;

	/* Requested */
	rwidth = pix->width;
	rheight = pix->height;

	/* Keep current field if no specific one is asked for */
	if (pix->field == V4L2_FIELD_ANY)
		pix->field = vin->format.field;

	/*
	 * Retrieve format information and select the current format if the
	 * requested format isn't supported.
	 */
	info = rvin_format_from_pixel(pix->pixelformat);
	if (!info) {
		vin_dbg(vin, "Format %x not found, keeping %x\n",
			pix->pixelformat, vin->format.pixelformat);
		*pix = vin->format;
		pix->width = rwidth;
		pix->height = rheight;
	}

	/* Always recalculate */
	pix->bytesperline = 0;
	pix->sizeimage = 0;

	/* Limit to source capabilities */
	__rvin_try_format_source(vin, which, pix, source);

	switch (pix->field) {
	case V4L2_FIELD_TOP:
	case V4L2_FIELD_BOTTOM:
	case V4L2_FIELD_ALTERNATE:
		pix->height /= 2;
		source->height /= 2;
		break;
	case V4L2_FIELD_NONE:
	case V4L2_FIELD_INTERLACED_TB:
	case V4L2_FIELD_INTERLACED_BT:
	case V4L2_FIELD_INTERLACED:
		break;
	default:
		pix->field = V4L2_FIELD_NONE;
		break;
	}

	/* If source can't match format try if VIN can scale */
	if (source->width != rwidth || source->height != rheight)
		rvin_scale_try(vin, pix, rwidth, rheight);

	/* HW limit width to a multiple of 32 (2^5) for NV16 else 2 (2^1) */
	walign = vin->format.pixelformat == V4L2_PIX_FMT_NV16 ? 5 : 1;

	/* Limit to VIN capabilities */
	v4l_bound_align_image(&pix->width, 2, RVIN_MAX_WIDTH, walign,
			      &pix->height, 4, RVIN_MAX_HEIGHT, 2, 0);

	pix->bytesperline = max_t(u32, pix->bytesperline,
				  rvin_format_bytesperline(pix));
	pix->sizeimage = max_t(u32, pix->sizeimage,
			       rvin_format_sizeimage(pix));

	if (vin->chip == RCAR_M1 && pix->pixelformat == V4L2_PIX_FMT_XBGR32) {
		vin_err(vin, "pixel format XBGR32 not supported on M1\n");
		return -EINVAL;
	}

	vin_dbg(vin, "Requested %ux%u Got %ux%u bpl: %d size: %d\n",
		rwidth, rheight, pix->width, pix->height,
		pix->bytesperline, pix->sizeimage);

	return 0;
}

static int rvin_querycap(struct file *file, void *priv,
			 struct v4l2_capability *cap)
{
	struct rvin_dev *vin = video_drvdata(file);

	strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
	strlcpy(cap->card, "R_Car_VIN", sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
		 dev_name(vin->dev));
	return 0;
}

static int rvin_try_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct rvin_source_fmt source;

	return __rvin_try_format(vin, V4L2_SUBDEV_FORMAT_TRY, &f->fmt.pix,
				 &source);
}

static int rvin_s_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct rvin_source_fmt source;
	int ret;

	if (vb2_is_busy(&vin->queue))
		return -EBUSY;

	ret = __rvin_try_format(vin, V4L2_SUBDEV_FORMAT_ACTIVE, &f->fmt.pix,
				&source);
	if (ret)
		return ret;

	vin->source.width = source.width;
	vin->source.height = source.height;

	vin->format = f->fmt.pix;

	rvin_reset_crop_compose(vin);

	return 0;
}

static int rvin_g_fmt_vid_cap(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct rvin_dev *vin = video_drvdata(file);

	f->fmt.pix = vin->format;

	return 0;
}

static int rvin_enum_fmt_vid_cap(struct file *file, void *priv,
				 struct v4l2_fmtdesc *f)
{
	if (f->index >= ARRAY_SIZE(rvin_formats))
		return -EINVAL;

	f->pixelformat = rvin_formats[f->index].fourcc;

	return 0;
}

static int rvin_g_selection(struct file *file, void *fh,
			    struct v4l2_selection *s)
{
	struct rvin_dev *vin = video_drvdata(file);

	if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	switch (s->target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
	case V4L2_SEL_TGT_CROP_DEFAULT:
		s->r.left = s->r.top = 0;
		s->r.width = vin->source.width;
		s->r.height = vin->source.height;
		break;
	case V4L2_SEL_TGT_CROP:
		s->r = vin->crop;
		break;
	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
		s->r.left = s->r.top = 0;
		s->r.width = vin->format.width;
		s->r.height = vin->format.height;
		break;
	case V4L2_SEL_TGT_COMPOSE:
		s->r = vin->compose;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int rvin_s_selection(struct file *file, void *fh,
			    struct v4l2_selection *s)
{
	struct rvin_dev *vin = video_drvdata(file);
	const struct rvin_video_format *fmt;
	struct v4l2_rect r = s->r;
	struct v4l2_rect max_rect;
	struct v4l2_rect min_rect = {
		.width = 6,
		.height = 2,
	};

	if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	v4l2_rect_set_min_size(&r, &min_rect);

	switch (s->target) {
	case V4L2_SEL_TGT_CROP:
		/* Can't crop outside of source input */
		max_rect.top = max_rect.left = 0;
		max_rect.width = vin->source.width;
		max_rect.height = vin->source.height;
		v4l2_rect_map_inside(&r, &max_rect);

		v4l_bound_align_image(&r.width, 2, vin->source.width, 1,
				      &r.height, 4, vin->source.height, 2, 0);

		r.top  = clamp_t(s32, r.top, 0, vin->source.height - r.height);
		r.left = clamp_t(s32, r.left, 0, vin->source.width - r.width);

		vin->crop = s->r = r;

		vin_dbg(vin, "Cropped %dx%d@%d:%d of %dx%d\n",
			r.width, r.height, r.left, r.top,
			vin->source.width, vin->source.height);
		break;
	case V4L2_SEL_TGT_COMPOSE:
		/* Make sure compose rect fits inside output format */
		max_rect.top = max_rect.left = 0;
		max_rect.width = vin->format.width;
		max_rect.height = vin->format.height;
		v4l2_rect_map_inside(&r, &max_rect);

		/*
		 * Composing is done by adding a offset to the buffer address,
		 * the HW wants this address to be aligned to HW_BUFFER_MASK.
		 * Make sure the top and left values meets this requirement.
		 */
		while ((r.top * vin->format.bytesperline) & HW_BUFFER_MASK)
			r.top--;

		fmt = rvin_format_from_pixel(vin->format.pixelformat);
		while ((r.left * fmt->bpp) & HW_BUFFER_MASK)
			r.left--;

		vin->compose = s->r = r;

		vin_dbg(vin, "Compose %dx%d@%d:%d in %dx%d\n",
			r.width, r.height, r.left, r.top,
			vin->format.width, vin->format.height);
		break;
	default:
		return -EINVAL;
	}

	/* HW supports modifying configuration while running */
	rvin_crop_scale_comp(vin);

	return 0;
}

static int rvin_cropcap(struct file *file, void *priv,
			struct v4l2_cropcap *crop)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);

	if (crop->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	return v4l2_subdev_call(sd, video, g_pixelaspect, &crop->pixelaspect);
}

static int rvin_enum_input(struct file *file, void *priv,
			   struct v4l2_input *i)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int ret;

	if (i->index != 0)
		return -EINVAL;

	ret = v4l2_subdev_call(sd, video, g_input_status, &i->status);
	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
		return ret;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	i->std = vin->vdev.tvnorms;

	if (v4l2_subdev_has_op(sd, pad, dv_timings_cap))
		i->capabilities = V4L2_IN_CAP_DV_TIMINGS;

	strlcpy(i->name, "Camera", sizeof(i->name));

	return 0;
}

static int rvin_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int rvin_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i > 0)
		return -EINVAL;
	return 0;
}

static int rvin_querystd(struct file *file, void *priv, v4l2_std_id *a)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);

	return v4l2_subdev_call(sd, video, querystd, a);
}

static int rvin_s_std(struct file *file, void *priv, v4l2_std_id a)
{
	struct rvin_dev *vin = video_drvdata(file);
	int ret;

	ret = v4l2_subdev_call(vin_to_source(vin), video, s_std, a);
	if (ret < 0)
		return ret;

	/* Changing the standard will change the width/height */
	return rvin_reset_format(vin);
}

static int rvin_g_std(struct file *file, void *priv, v4l2_std_id *a)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);

	return v4l2_subdev_call(sd, video, g_std, a);
}

static int rvin_subscribe_event(struct v4l2_fh *fh,
				const struct v4l2_event_subscription *sub)
{
	switch (sub->type) {
	case V4L2_EVENT_SOURCE_CHANGE:
		return v4l2_event_subscribe(fh, sub, 4, NULL);
	}
	return v4l2_ctrl_subscribe_event(fh, sub);
}

static int rvin_enum_dv_timings(struct file *file, void *priv_fh,
				struct v4l2_enum_dv_timings *timings)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int pad, ret;

	pad = timings->pad;
	timings->pad = vin->sink_pad_idx;

	ret = v4l2_subdev_call(sd, pad, enum_dv_timings, timings);

	timings->pad = pad;

	return ret;
}

static int rvin_s_dv_timings(struct file *file, void *priv_fh,
			     struct v4l2_dv_timings *timings)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int ret;

	ret = v4l2_subdev_call(sd, video, s_dv_timings, timings);
	if (ret)
		return ret;

	vin->source.width = timings->bt.width;
	vin->source.height = timings->bt.height;
	vin->format.width = timings->bt.width;
	vin->format.height = timings->bt.height;

	return 0;
}

static int rvin_g_dv_timings(struct file *file, void *priv_fh,
			     struct v4l2_dv_timings *timings)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);

	return v4l2_subdev_call(sd, video, g_dv_timings, timings);
}

static int rvin_query_dv_timings(struct file *file, void *priv_fh,
				 struct v4l2_dv_timings *timings)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);

	return v4l2_subdev_call(sd, video, query_dv_timings, timings);
}

static int rvin_dv_timings_cap(struct file *file, void *priv_fh,
			       struct v4l2_dv_timings_cap *cap)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int pad, ret;

	pad = cap->pad;
	cap->pad = vin->sink_pad_idx;

	ret = v4l2_subdev_call(sd, pad, dv_timings_cap, cap);

	cap->pad = pad;

	return ret;
}

static int rvin_g_edid(struct file *file, void *fh, struct v4l2_edid *edid)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int input, ret;

	if (edid->pad)
		return -EINVAL;

	input = edid->pad;
	edid->pad = vin->sink_pad_idx;

	ret = v4l2_subdev_call(sd, pad, get_edid, edid);

	edid->pad = input;

	return ret;
}

static int rvin_s_edid(struct file *file, void *fh, struct v4l2_edid *edid)
{
	struct rvin_dev *vin = video_drvdata(file);
	struct v4l2_subdev *sd = vin_to_source(vin);
	int input, ret;

	if (edid->pad)
		return -EINVAL;

	input = edid->pad;
	edid->pad = vin->sink_pad_idx;

	ret = v4l2_subdev_call(sd, pad, set_edid, edid);

	edid->pad = input;

	return ret;
}

static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
	.vidioc_querycap		= rvin_querycap,
	.vidioc_try_fmt_vid_cap		= rvin_try_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap		= rvin_g_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		= rvin_s_fmt_vid_cap,
	.vidioc_enum_fmt_vid_cap	= rvin_enum_fmt_vid_cap,

	.vidioc_g_selection		= rvin_g_selection,
	.vidioc_s_selection		= rvin_s_selection,

	.vidioc_cropcap			= rvin_cropcap,

	.vidioc_enum_input		= rvin_enum_input,
	.vidioc_g_input			= rvin_g_input,
	.vidioc_s_input			= rvin_s_input,

	.vidioc_dv_timings_cap		= rvin_dv_timings_cap,
	.vidioc_enum_dv_timings		= rvin_enum_dv_timings,
	.vidioc_g_dv_timings		= rvin_g_dv_timings,
	.vidioc_s_dv_timings		= rvin_s_dv_timings,
	.vidioc_query_dv_timings	= rvin_query_dv_timings,

	.vidioc_g_edid			= rvin_g_edid,
	.vidioc_s_edid			= rvin_s_edid,

	.vidioc_querystd		= rvin_querystd,
	.vidioc_g_std			= rvin_g_std,
	.vidioc_s_std			= rvin_s_std,

	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_expbuf			= vb2_ioctl_expbuf,
	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,

	.vidioc_log_status		= v4l2_ctrl_log_status,
	.vidioc_subscribe_event		= rvin_subscribe_event,
	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
};

/* -----------------------------------------------------------------------------
 * File Operations
 */

static int rvin_power_on(struct rvin_dev *vin)
{
	int ret;
	struct v4l2_subdev *sd = vin_to_source(vin);

	pm_runtime_get_sync(vin->v4l2_dev.dev);

	ret = v4l2_subdev_call(sd, core, s_power, 1);
	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
		return ret;
	return 0;
}

static int rvin_power_off(struct rvin_dev *vin)
{
	int ret;
	struct v4l2_subdev *sd = vin_to_source(vin);

	ret = v4l2_subdev_call(sd, core, s_power, 0);

	pm_runtime_put(vin->v4l2_dev.dev);

	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
		return ret;

	return 0;
}

static int rvin_initialize_device(struct file *file)
{
	struct rvin_dev *vin = video_drvdata(file);
	int ret;

	struct v4l2_format f = {
		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
		.fmt.pix = {
			.width		= vin->format.width,
			.height		= vin->format.height,
			.field		= vin->format.field,
			.colorspace	= vin->format.colorspace,
			.pixelformat	= vin->format.pixelformat,
		},
	};

	ret = rvin_power_on(vin);
	if (ret < 0)
		return ret;

	pm_runtime_enable(&vin->vdev.dev);
	ret = pm_runtime_resume(&vin->vdev.dev);
	if (ret < 0 && ret != -ENOSYS)
		goto eresume;

	/*
	 * Try to configure with default parameters. Notice: this is the
	 * very first open, so, we cannot race against other calls,
	 * apart from someone else calling open() simultaneously, but
	 * .host_lock is protecting us against it.
	 */
	ret = rvin_s_fmt_vid_cap(file, NULL, &f);
	if (ret < 0)
		goto esfmt;

	v4l2_ctrl_handler_setup(&vin->ctrl_handler);

	return 0;
esfmt:
	pm_runtime_disable(&vin->vdev.dev);
eresume:
	rvin_power_off(vin);

	return ret;
}

static int rvin_open(struct file *file)
{
	struct rvin_dev *vin = video_drvdata(file);
	int ret;

	mutex_lock(&vin->lock);

	file->private_data = vin;

	ret = v4l2_fh_open(file);
	if (ret)
		goto unlock;

	if (!v4l2_fh_is_singular_file(file))
		goto unlock;

	if (rvin_initialize_device(file)) {
		v4l2_fh_release(file);
		ret = -ENODEV;
	}

unlock:
	mutex_unlock(&vin->lock);
	return ret;
}

static int rvin_release(struct file *file)
{
	struct rvin_dev *vin = video_drvdata(file);
	bool fh_singular;
	int ret;

	mutex_lock(&vin->lock);

	/* Save the singular status before we call the clean-up helper */
	fh_singular = v4l2_fh_is_singular_file(file);

	/* the release helper will cleanup any on-going streaming */
	ret = _vb2_fop_release(file, NULL);

	/*
	 * If this was the last open file.
	 * Then de-initialize hw module.
	 */
	if (fh_singular) {
		pm_runtime_suspend(&vin->vdev.dev);
		pm_runtime_disable(&vin->vdev.dev);
		rvin_power_off(vin);
	}

	mutex_unlock(&vin->lock);

	return ret;
}

static const struct v4l2_file_operations rvin_fops = {
	.owner		= THIS_MODULE,
	.unlocked_ioctl	= video_ioctl2,
	.open		= rvin_open,
	.release	= rvin_release,
	.poll		= vb2_fop_poll,
	.mmap		= vb2_fop_mmap,
	.read		= vb2_fop_read,
};

void rvin_v4l2_remove(struct rvin_dev *vin)
{
	v4l2_info(&vin->v4l2_dev, "Removing %s\n",
		  video_device_node_name(&vin->vdev));

	/* Checks internaly if handlers have been init or not */
	v4l2_ctrl_handler_free(&vin->ctrl_handler);

	/* Checks internaly if vdev have been init or not */
	video_unregister_device(&vin->vdev);
}

static void rvin_notify(struct v4l2_subdev *sd,
			unsigned int notification, void *arg)
{
	struct rvin_dev *vin =
		container_of(sd->v4l2_dev, struct rvin_dev, v4l2_dev);

	switch (notification) {
	case V4L2_DEVICE_NOTIFY_EVENT:
		v4l2_event_queue(&vin->vdev, arg);
		break;
	default:
		break;
	}
}

int rvin_v4l2_probe(struct rvin_dev *vin)
{
	struct video_device *vdev = &vin->vdev;
	struct v4l2_subdev *sd = vin_to_source(vin);
	int pad_idx, ret;

	v4l2_set_subdev_hostdata(sd, vin);

	vin->v4l2_dev.notify = rvin_notify;

	ret = v4l2_subdev_call(sd, video, g_tvnorms, &vin->vdev.tvnorms);
	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
		return ret;

	if (vin->vdev.tvnorms == 0) {
		/* Disable the STD API if there are no tvnorms defined */
		v4l2_disable_ioctl(&vin->vdev, VIDIOC_G_STD);
		v4l2_disable_ioctl(&vin->vdev, VIDIOC_S_STD);
		v4l2_disable_ioctl(&vin->vdev, VIDIOC_QUERYSTD);
		v4l2_disable_ioctl(&vin->vdev, VIDIOC_ENUMSTD);
	}

	/* Add the controls */
	/*
	 * Currently the subdev with the largest number of controls (13) is
	 * ov6550. So let's pick 16 as a hint for the control handler. Note
	 * that this is a hint only: too large and you waste some memory, too
	 * small and there is a (very) small performance hit when looking up
	 * controls in the internal hash.
	 */
	ret = v4l2_ctrl_handler_init(&vin->ctrl_handler, 16);
	if (ret < 0)
		return ret;

	ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, sd->ctrl_handler, NULL);
	if (ret < 0)
		return ret;

	/* video node */
	vdev->fops = &rvin_fops;
	vdev->v4l2_dev = &vin->v4l2_dev;
	vdev->queue = &vin->queue;
	strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
	vdev->release = video_device_release_empty;
	vdev->ioctl_ops = &rvin_ioctl_ops;
	vdev->lock = &vin->lock;
	vdev->ctrl_handler = &vin->ctrl_handler;
	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
		V4L2_CAP_READWRITE;

	vin->src_pad_idx = 0;
	for (pad_idx = 0; pad_idx < sd->entity.num_pads; pad_idx++)
		if (sd->entity.pads[pad_idx].flags == MEDIA_PAD_FL_SOURCE)
			break;
	if (pad_idx >= sd->entity.num_pads)
		return -EINVAL;

	vin->src_pad_idx = pad_idx;

	vin->sink_pad_idx = 0;
	for (pad_idx = 0; pad_idx < sd->entity.num_pads; pad_idx++)
		if (sd->entity.pads[pad_idx].flags == MEDIA_PAD_FL_SINK) {
			vin->sink_pad_idx = pad_idx;
			break;
		}

	vin->format.pixelformat	= RVIN_DEFAULT_FORMAT;
	rvin_reset_format(vin);

	ret = video_register_device(&vin->vdev, VFL_TYPE_GRABBER, -1);
	if (ret) {
		vin_err(vin, "Failed to register video device\n");
		return ret;
	}

	video_set_drvdata(&vin->vdev, vin);

	v4l2_info(&vin->v4l2_dev, "Device registered as %s\n",
		  video_device_node_name(&vin->vdev));

	return ret;
}