summaryrefslogtreecommitdiff
path: root/drivers/media/platform/vim2m.c
blob: d9d844aab39b76aa49d43bf5bcb8ade5fdfaf826 (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
/*
 * A virtual v4l2-mem2mem example device.
 *
 * This is a virtual device driver for testing mem-to-mem videobuf framework.
 * It simulates a device that uses memory buffers for both source and
 * destination, processes the data and issues an "irq" (simulated by a timer).
 * The device is capable of multi-instance, multi-buffer-per-transaction
 * operation (via the mem2mem framework).
 *
 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
 * Pawel Osciak, <pawel@osciak.com>
 * Marek Szyprowski, <m.szyprowski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version
 */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <linux/platform_device.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-vmalloc.h>

MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1.1");
MODULE_ALIAS("mem2mem_testdev");

static unsigned debug;
module_param(debug, uint, 0644);
MODULE_PARM_DESC(debug, "activates debug info");

#define MIN_W 32
#define MIN_H 32
#define MAX_W 640
#define MAX_H 480
#define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */

/* Flags that indicate a format can be used for capture/output */
#define MEM2MEM_CAPTURE	(1 << 0)
#define MEM2MEM_OUTPUT	(1 << 1)

#define MEM2MEM_NAME		"vim2m"

/* Per queue */
#define MEM2MEM_DEF_NUM_BUFS	VIDEO_MAX_FRAME
/* In bytes, per queue */
#define MEM2MEM_VID_MEM_LIMIT	(16 * 1024 * 1024)

/* Default transaction time in msec */
#define MEM2MEM_DEF_TRANSTIME	40
#define MEM2MEM_COLOR_STEP	(0xff >> 4)
#define MEM2MEM_NUM_TILES	8

/* Flags that indicate processing mode */
#define MEM2MEM_HFLIP	(1 << 0)
#define MEM2MEM_VFLIP	(1 << 1)

#define dprintk(dev, fmt, arg...) \
	v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)


static void vim2m_dev_release(struct device *dev)
{}

static struct platform_device vim2m_pdev = {
	.name		= MEM2MEM_NAME,
	.dev.release	= vim2m_dev_release,
};

struct vim2m_fmt {
	char	*name;
	u32	fourcc;
	int	depth;
	/* Types the format can be used for */
	u32	types;
};

static struct vim2m_fmt formats[] = {
	{
		.name	= "RGB565 (BE)",
		.fourcc	= V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
		.depth	= 16,
		/* Both capture and output format */
		.types	= MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
	},
	{
		.name	= "4:2:2, packed, YUYV",
		.fourcc	= V4L2_PIX_FMT_YUYV,
		.depth	= 16,
		/* Output-only format */
		.types	= MEM2MEM_OUTPUT,
	},
};

#define NUM_FORMATS ARRAY_SIZE(formats)

/* Per-queue, driver-specific private data */
struct vim2m_q_data {
	unsigned int		width;
	unsigned int		height;
	unsigned int		sizeimage;
	unsigned int		sequence;
	struct vim2m_fmt	*fmt;
};

enum {
	V4L2_M2M_SRC = 0,
	V4L2_M2M_DST = 1,
};

#define V4L2_CID_TRANS_TIME_MSEC	(V4L2_CID_USER_BASE + 0x1000)
#define V4L2_CID_TRANS_NUM_BUFS		(V4L2_CID_USER_BASE + 0x1001)

static struct vim2m_fmt *find_format(struct v4l2_format *f)
{
	struct vim2m_fmt *fmt;
	unsigned int k;

	for (k = 0; k < NUM_FORMATS; k++) {
		fmt = &formats[k];
		if (fmt->fourcc == f->fmt.pix.pixelformat)
			break;
	}

	if (k == NUM_FORMATS)
		return NULL;

	return &formats[k];
}

struct vim2m_dev {
	struct v4l2_device	v4l2_dev;
	struct video_device	*vfd;

	atomic_t		num_inst;
	struct mutex		dev_mutex;
	spinlock_t		irqlock;

	struct timer_list	timer;

	struct v4l2_m2m_dev	*m2m_dev;
};

struct vim2m_ctx {
	struct v4l2_fh		fh;
	struct vim2m_dev	*dev;

	struct v4l2_ctrl_handler hdl;

	/* Processed buffers in this transaction */
	u8			num_processed;

	/* Transaction length (i.e. how many buffers per transaction) */
	u32			translen;
	/* Transaction time (i.e. simulated processing time) in milliseconds */
	u32			transtime;

	/* Abort requested by m2m */
	int			aborting;

	/* Processing mode */
	int			mode;

	enum v4l2_colorspace	colorspace;

	/* Source and destination queue data */
	struct vim2m_q_data   q_data[2];
};

static inline struct vim2m_ctx *file2ctx(struct file *file)
{
	return container_of(file->private_data, struct vim2m_ctx, fh);
}

static struct vim2m_q_data *get_q_data(struct vim2m_ctx *ctx,
					 enum v4l2_buf_type type)
{
	switch (type) {
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		return &ctx->q_data[V4L2_M2M_SRC];
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		return &ctx->q_data[V4L2_M2M_DST];
	default:
		BUG();
	}
	return NULL;
}


static int device_process(struct vim2m_ctx *ctx,
			  struct vb2_buffer *in_vb,
			  struct vb2_buffer *out_vb)
{
	struct vim2m_dev *dev = ctx->dev;
	struct vim2m_q_data *q_data;
	u8 *p_in, *p_out;
	int x, y, t, w;
	int tile_w, bytes_left;
	int width, height, bytesperline;

	q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);

	width	= q_data->width;
	height	= q_data->height;
	bytesperline	= (q_data->width * q_data->fmt->depth) >> 3;

	p_in = vb2_plane_vaddr(in_vb, 0);
	p_out = vb2_plane_vaddr(out_vb, 0);
	if (!p_in || !p_out) {
		v4l2_err(&dev->v4l2_dev,
			 "Acquiring kernel pointers to buffers failed\n");
		return -EFAULT;
	}

	if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) {
		v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
		return -EINVAL;
	}

	tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
		/ MEM2MEM_NUM_TILES;
	bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
	w = 0;

	out_vb->v4l2_buf.sequence = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++;
	in_vb->v4l2_buf.sequence = q_data->sequence++;
	memcpy(&out_vb->v4l2_buf.timestamp,
			&in_vb->v4l2_buf.timestamp,
			sizeof(struct timeval));
	if (in_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TIMECODE)
		memcpy(&out_vb->v4l2_buf.timecode, &in_vb->v4l2_buf.timecode,
			sizeof(struct v4l2_timecode));
	out_vb->v4l2_buf.field = in_vb->v4l2_buf.field;
	out_vb->v4l2_buf.flags = in_vb->v4l2_buf.flags &
		(V4L2_BUF_FLAG_TIMECODE |
		 V4L2_BUF_FLAG_KEYFRAME |
		 V4L2_BUF_FLAG_PFRAME |
		 V4L2_BUF_FLAG_BFRAME |
		 V4L2_BUF_FLAG_TSTAMP_SRC_MASK);

	switch (ctx->mode) {
	case MEM2MEM_HFLIP | MEM2MEM_VFLIP:
		p_out += bytesperline * height - bytes_left;
		for (y = 0; y < height; ++y) {
			for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
				if (w & 0x1) {
					for (x = 0; x < tile_w; ++x)
						*--p_out = *p_in++ +
							MEM2MEM_COLOR_STEP;
				} else {
					for (x = 0; x < tile_w; ++x)
						*--p_out = *p_in++ -
							MEM2MEM_COLOR_STEP;
				}
				++w;
			}
			p_in += bytes_left;
			p_out -= bytes_left;
		}
		break;

	case MEM2MEM_HFLIP:
		for (y = 0; y < height; ++y) {
			p_out += MEM2MEM_NUM_TILES * tile_w;
			for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
				if (w & 0x01) {
					for (x = 0; x < tile_w; ++x)
						*--p_out = *p_in++ +
							MEM2MEM_COLOR_STEP;
				} else {
					for (x = 0; x < tile_w; ++x)
						*--p_out = *p_in++ -
							MEM2MEM_COLOR_STEP;
				}
				++w;
			}
			p_in += bytes_left;
			p_out += bytesperline;
		}
		break;

	case MEM2MEM_VFLIP:
		p_out += bytesperline * (height - 1);
		for (y = 0; y < height; ++y) {
			for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
				if (w & 0x1) {
					for (x = 0; x < tile_w; ++x)
						*p_out++ = *p_in++ +
							MEM2MEM_COLOR_STEP;
				} else {
					for (x = 0; x < tile_w; ++x)
						*p_out++ = *p_in++ -
							MEM2MEM_COLOR_STEP;
				}
				++w;
			}
			p_in += bytes_left;
			p_out += bytes_left - 2 * bytesperline;
		}
		break;

	default:
		for (y = 0; y < height; ++y) {
			for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
				if (w & 0x1) {
					for (x = 0; x < tile_w; ++x)
						*p_out++ = *p_in++ +
							MEM2MEM_COLOR_STEP;
				} else {
					for (x = 0; x < tile_w; ++x)
						*p_out++ = *p_in++ -
							MEM2MEM_COLOR_STEP;
				}
				++w;
			}
			p_in += bytes_left;
			p_out += bytes_left;
		}
	}

	return 0;
}

static void schedule_irq(struct vim2m_dev *dev, int msec_timeout)
{
	dprintk(dev, "Scheduling a simulated irq\n");
	mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
}

/*
 * mem2mem callbacks
 */

/**
 * job_ready() - check whether an instance is ready to be scheduled to run
 */
static int job_ready(void *priv)
{
	struct vim2m_ctx *ctx = priv;

	if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
	    || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
		dprintk(ctx->dev, "Not enough buffers available\n");
		return 0;
	}

	return 1;
}

static void job_abort(void *priv)
{
	struct vim2m_ctx *ctx = priv;

	/* Will cancel the transaction in the next interrupt handler */
	ctx->aborting = 1;
}

/* device_run() - prepares and starts the device
 *
 * This simulates all the immediate preparations required before starting
 * a device. This will be called by the framework when it decides to schedule
 * a particular instance.
 */
static void device_run(void *priv)
{
	struct vim2m_ctx *ctx = priv;
	struct vim2m_dev *dev = ctx->dev;
	struct vb2_buffer *src_buf, *dst_buf;

	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);

	device_process(ctx, src_buf, dst_buf);

	/* Run a timer, which simulates a hardware irq  */
	schedule_irq(dev, ctx->transtime);
}

static void device_isr(unsigned long priv)
{
	struct vim2m_dev *vim2m_dev = (struct vim2m_dev *)priv;
	struct vim2m_ctx *curr_ctx;
	struct vb2_buffer *src_vb, *dst_vb;
	unsigned long flags;

	curr_ctx = v4l2_m2m_get_curr_priv(vim2m_dev->m2m_dev);

	if (NULL == curr_ctx) {
		pr_err("Instance released before the end of transaction\n");
		return;
	}

	src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
	dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);

	curr_ctx->num_processed++;

	spin_lock_irqsave(&vim2m_dev->irqlock, flags);
	v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
	v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
	spin_unlock_irqrestore(&vim2m_dev->irqlock, flags);

	if (curr_ctx->num_processed == curr_ctx->translen
	    || curr_ctx->aborting) {
		dprintk(curr_ctx->dev, "Finishing transaction\n");
		curr_ctx->num_processed = 0;
		v4l2_m2m_job_finish(vim2m_dev->m2m_dev, curr_ctx->fh.m2m_ctx);
	} else {
		device_run(curr_ctx);
	}
}

/*
 * video ioctls
 */
static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
	strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
	snprintf(cap->bus_info, sizeof(cap->bus_info),
			"platform:%s", MEM2MEM_NAME);
	cap->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
{
	int i, num;
	struct vim2m_fmt *fmt;

	num = 0;

	for (i = 0; i < NUM_FORMATS; ++i) {
		if (formats[i].types & type) {
			/* index-th format of type type found ? */
			if (num == f->index)
				break;
			/* Correct type but haven't reached our index yet,
			 * just increment per-type index */
			++num;
		}
	}

	if (i < NUM_FORMATS) {
		/* Format found */
		fmt = &formats[i];
		strncpy(f->description, fmt->name, sizeof(f->description) - 1);
		f->pixelformat = fmt->fourcc;
		return 0;
	}

	/* Format not found */
	return -EINVAL;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	return enum_fmt(f, MEM2MEM_CAPTURE);
}

static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
				   struct v4l2_fmtdesc *f)
{
	return enum_fmt(f, MEM2MEM_OUTPUT);
}

static int vidioc_g_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
{
	struct vb2_queue *vq;
	struct vim2m_q_data *q_data;

	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
	if (!vq)
		return -EINVAL;

	q_data = get_q_data(ctx, f->type);

	f->fmt.pix.width	= q_data->width;
	f->fmt.pix.height	= q_data->height;
	f->fmt.pix.field	= V4L2_FIELD_NONE;
	f->fmt.pix.pixelformat	= q_data->fmt->fourcc;
	f->fmt.pix.bytesperline	= (q_data->width * q_data->fmt->depth) >> 3;
	f->fmt.pix.sizeimage	= q_data->sizeimage;
	f->fmt.pix.colorspace	= ctx->colorspace;

	return 0;
}

static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *f)
{
	return vidioc_g_fmt(file2ctx(file), f);
}

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	return vidioc_g_fmt(file2ctx(file), f);
}

static int vidioc_try_fmt(struct v4l2_format *f, struct vim2m_fmt *fmt)
{
	/* V4L2 specification suggests the driver corrects the format struct
	 * if any of the dimensions is unsupported */
	if (f->fmt.pix.height < MIN_H)
		f->fmt.pix.height = MIN_H;
	else if (f->fmt.pix.height > MAX_H)
		f->fmt.pix.height = MAX_H;

	if (f->fmt.pix.width < MIN_W)
		f->fmt.pix.width = MIN_W;
	else if (f->fmt.pix.width > MAX_W)
		f->fmt.pix.width = MAX_W;

	f->fmt.pix.width &= ~DIM_ALIGN_MASK;
	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
	f->fmt.pix.field = V4L2_FIELD_NONE;

	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct vim2m_fmt *fmt;
	struct vim2m_ctx *ctx = file2ctx(file);

	fmt = find_format(f);
	if (!fmt) {
		f->fmt.pix.pixelformat = formats[0].fourcc;
		fmt = find_format(f);
	}
	if (!(fmt->types & MEM2MEM_CAPTURE)) {
		v4l2_err(&ctx->dev->v4l2_dev,
			 "Fourcc format (0x%08x) invalid.\n",
			 f->fmt.pix.pixelformat);
		return -EINVAL;
	}
	f->fmt.pix.colorspace = ctx->colorspace;

	return vidioc_try_fmt(f, fmt);
}

static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct vim2m_fmt *fmt;
	struct vim2m_ctx *ctx = file2ctx(file);

	fmt = find_format(f);
	if (!fmt) {
		f->fmt.pix.pixelformat = formats[0].fourcc;
		fmt = find_format(f);
	}
	if (!(fmt->types & MEM2MEM_OUTPUT)) {
		v4l2_err(&ctx->dev->v4l2_dev,
			 "Fourcc format (0x%08x) invalid.\n",
			 f->fmt.pix.pixelformat);
		return -EINVAL;
	}
	if (!f->fmt.pix.colorspace)
		f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;

	return vidioc_try_fmt(f, fmt);
}

static int vidioc_s_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
{
	struct vim2m_q_data *q_data;
	struct vb2_queue *vq;

	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
	if (!vq)
		return -EINVAL;

	q_data = get_q_data(ctx, f->type);
	if (!q_data)
		return -EINVAL;

	if (vb2_is_busy(vq)) {
		v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
		return -EBUSY;
	}

	q_data->fmt		= find_format(f);
	q_data->width		= f->fmt.pix.width;
	q_data->height		= f->fmt.pix.height;
	q_data->sizeimage	= q_data->width * q_data->height
				* q_data->fmt->depth >> 3;

	dprintk(ctx->dev,
		"Setting format for type %d, wxh: %dx%d, fmt: %d\n",
		f->type, q_data->width, q_data->height, q_data->fmt->fourcc);

	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	int ret;

	ret = vidioc_try_fmt_vid_cap(file, priv, f);
	if (ret)
		return ret;

	return vidioc_s_fmt(file2ctx(file), f);
}

static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct vim2m_ctx *ctx = file2ctx(file);
	int ret;

	ret = vidioc_try_fmt_vid_out(file, priv, f);
	if (ret)
		return ret;

	ret = vidioc_s_fmt(file2ctx(file), f);
	if (!ret)
		ctx->colorspace = f->fmt.pix.colorspace;
	return ret;
}

static int vim2m_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct vim2m_ctx *ctx =
		container_of(ctrl->handler, struct vim2m_ctx, hdl);

	switch (ctrl->id) {
	case V4L2_CID_HFLIP:
		if (ctrl->val)
			ctx->mode |= MEM2MEM_HFLIP;
		else
			ctx->mode &= ~MEM2MEM_HFLIP;
		break;

	case V4L2_CID_VFLIP:
		if (ctrl->val)
			ctx->mode |= MEM2MEM_VFLIP;
		else
			ctx->mode &= ~MEM2MEM_VFLIP;
		break;

	case V4L2_CID_TRANS_TIME_MSEC:
		ctx->transtime = ctrl->val;
		break;

	case V4L2_CID_TRANS_NUM_BUFS:
		ctx->translen = ctrl->val;
		break;

	default:
		v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
		return -EINVAL;
	}

	return 0;
}

static const struct v4l2_ctrl_ops vim2m_ctrl_ops = {
	.s_ctrl = vim2m_s_ctrl,
};


static const struct v4l2_ioctl_ops vim2m_ioctl_ops = {
	.vidioc_querycap	= vidioc_querycap,

	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap	= vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap	= vidioc_s_fmt_vid_cap,

	.vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
	.vidioc_g_fmt_vid_out	= vidioc_g_fmt_vid_out,
	.vidioc_try_fmt_vid_out	= vidioc_try_fmt_vid_out,
	.vidioc_s_fmt_vid_out	= vidioc_s_fmt_vid_out,

	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
	.vidioc_qbuf		= v4l2_m2m_ioctl_qbuf,
	.vidioc_dqbuf		= v4l2_m2m_ioctl_dqbuf,
	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,

	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,

	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};


/*
 * Queue operations
 */

static int vim2m_queue_setup(struct vb2_queue *vq,
				const struct v4l2_format *fmt,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], void *alloc_ctxs[])
{
	struct vim2m_ctx *ctx = vb2_get_drv_priv(vq);
	struct vim2m_q_data *q_data;
	unsigned int size, count = *nbuffers;

	q_data = get_q_data(ctx, vq->type);

	size = q_data->width * q_data->height * q_data->fmt->depth >> 3;

	while (size * count > MEM2MEM_VID_MEM_LIMIT)
		(count)--;

	*nplanes = 1;
	*nbuffers = count;
	sizes[0] = size;

	/*
	 * videobuf2-vmalloc allocator is context-less so no need to set
	 * alloc_ctxs array.
	 */

	dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);

	return 0;
}

static int vim2m_buf_prepare(struct vb2_buffer *vb)
{
	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct vim2m_q_data *q_data;

	dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);

	q_data = get_q_data(ctx, vb->vb2_queue->type);
	if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
		if (vb->v4l2_buf.field == V4L2_FIELD_ANY)
			vb->v4l2_buf.field = V4L2_FIELD_NONE;
		if (vb->v4l2_buf.field != V4L2_FIELD_NONE) {
			dprintk(ctx->dev, "%s field isn't supported\n",
					__func__);
			return -EINVAL;
		}
	}

	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
		dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
				__func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
		return -EINVAL;
	}

	vb2_set_plane_payload(vb, 0, q_data->sizeimage);

	return 0;
}

static void vim2m_buf_queue(struct vb2_buffer *vb)
{
	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);

	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vb);
}

static int vim2m_start_streaming(struct vb2_queue *q, unsigned count)
{
	struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
	struct vim2m_q_data *q_data = get_q_data(ctx, q->type);

	q_data->sequence = 0;
	return 0;
}

static void vim2m_stop_streaming(struct vb2_queue *q)
{
	struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
	struct vb2_buffer *vb;
	unsigned long flags;

	for (;;) {
		if (V4L2_TYPE_IS_OUTPUT(q->type))
			vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
		else
			vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
		if (vb == NULL)
			return;
		spin_lock_irqsave(&ctx->dev->irqlock, flags);
		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
		spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
	}
}

static struct vb2_ops vim2m_qops = {
	.queue_setup	 = vim2m_queue_setup,
	.buf_prepare	 = vim2m_buf_prepare,
	.buf_queue	 = vim2m_buf_queue,
	.start_streaming = vim2m_start_streaming,
	.stop_streaming  = vim2m_stop_streaming,
	.wait_prepare	 = vb2_ops_wait_prepare,
	.wait_finish	 = vb2_ops_wait_finish,
};

static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
{
	struct vim2m_ctx *ctx = priv;
	int ret;

	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
	src_vq->drv_priv = ctx;
	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	src_vq->ops = &vim2m_qops;
	src_vq->mem_ops = &vb2_vmalloc_memops;
	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
	src_vq->lock = &ctx->dev->dev_mutex;

	ret = vb2_queue_init(src_vq);
	if (ret)
		return ret;

	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
	dst_vq->drv_priv = ctx;
	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
	dst_vq->ops = &vim2m_qops;
	dst_vq->mem_ops = &vb2_vmalloc_memops;
	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
	dst_vq->lock = &ctx->dev->dev_mutex;

	return vb2_queue_init(dst_vq);
}

static const struct v4l2_ctrl_config vim2m_ctrl_trans_time_msec = {
	.ops = &vim2m_ctrl_ops,
	.id = V4L2_CID_TRANS_TIME_MSEC,
	.name = "Transaction Time (msec)",
	.type = V4L2_CTRL_TYPE_INTEGER,
	.def = MEM2MEM_DEF_TRANSTIME,
	.min = 1,
	.max = 10001,
	.step = 1,
};

static const struct v4l2_ctrl_config vim2m_ctrl_trans_num_bufs = {
	.ops = &vim2m_ctrl_ops,
	.id = V4L2_CID_TRANS_NUM_BUFS,
	.name = "Buffers Per Transaction",
	.type = V4L2_CTRL_TYPE_INTEGER,
	.def = 1,
	.min = 1,
	.max = MEM2MEM_DEF_NUM_BUFS,
	.step = 1,
};

/*
 * File operations
 */
static int vim2m_open(struct file *file)
{
	struct vim2m_dev *dev = video_drvdata(file);
	struct vim2m_ctx *ctx = NULL;
	struct v4l2_ctrl_handler *hdl;
	int rc = 0;

	if (mutex_lock_interruptible(&dev->dev_mutex))
		return -ERESTARTSYS;
	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx) {
		rc = -ENOMEM;
		goto open_unlock;
	}

	v4l2_fh_init(&ctx->fh, video_devdata(file));
	file->private_data = &ctx->fh;
	ctx->dev = dev;
	hdl = &ctx->hdl;
	v4l2_ctrl_handler_init(hdl, 4);
	v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_time_msec, NULL);
	v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_num_bufs, NULL);
	if (hdl->error) {
		rc = hdl->error;
		v4l2_ctrl_handler_free(hdl);
		goto open_unlock;
	}
	ctx->fh.ctrl_handler = hdl;
	v4l2_ctrl_handler_setup(hdl);

	ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
	ctx->q_data[V4L2_M2M_SRC].width = 640;
	ctx->q_data[V4L2_M2M_SRC].height = 480;
	ctx->q_data[V4L2_M2M_SRC].sizeimage =
		ctx->q_data[V4L2_M2M_SRC].width *
		ctx->q_data[V4L2_M2M_SRC].height *
		(ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
	ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
	ctx->colorspace = V4L2_COLORSPACE_REC709;

	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);

	if (IS_ERR(ctx->fh.m2m_ctx)) {
		rc = PTR_ERR(ctx->fh.m2m_ctx);

		v4l2_ctrl_handler_free(hdl);
		kfree(ctx);
		goto open_unlock;
	}

	v4l2_fh_add(&ctx->fh);
	atomic_inc(&dev->num_inst);

	dprintk(dev, "Created instance: %p, m2m_ctx: %p\n",
		ctx, ctx->fh.m2m_ctx);

open_unlock:
	mutex_unlock(&dev->dev_mutex);
	return rc;
}

static int vim2m_release(struct file *file)
{
	struct vim2m_dev *dev = video_drvdata(file);
	struct vim2m_ctx *ctx = file2ctx(file);

	dprintk(dev, "Releasing instance %p\n", ctx);

	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	v4l2_ctrl_handler_free(&ctx->hdl);
	mutex_lock(&dev->dev_mutex);
	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
	mutex_unlock(&dev->dev_mutex);
	kfree(ctx);

	atomic_dec(&dev->num_inst);

	return 0;
}

static const struct v4l2_file_operations vim2m_fops = {
	.owner		= THIS_MODULE,
	.open		= vim2m_open,
	.release	= vim2m_release,
	.poll		= v4l2_m2m_fop_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= v4l2_m2m_fop_mmap,
};

static struct video_device vim2m_videodev = {
	.name		= MEM2MEM_NAME,
	.vfl_dir	= VFL_DIR_M2M,
	.fops		= &vim2m_fops,
	.ioctl_ops	= &vim2m_ioctl_ops,
	.minor		= -1,
	.release	= video_device_release,
};

static struct v4l2_m2m_ops m2m_ops = {
	.device_run	= device_run,
	.job_ready	= job_ready,
	.job_abort	= job_abort,
};

static int vim2m_probe(struct platform_device *pdev)
{
	struct vim2m_dev *dev;
	struct video_device *vfd;
	int ret;

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	spin_lock_init(&dev->irqlock);

	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
	if (ret)
		return ret;

	atomic_set(&dev->num_inst, 0);
	mutex_init(&dev->dev_mutex);

	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
		ret = -ENOMEM;
		goto unreg_dev;
	}

	*vfd = vim2m_videodev;
	vfd->lock = &dev->dev_mutex;
	vfd->v4l2_dev = &dev->v4l2_dev;

	ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
	if (ret) {
		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
		goto rel_vdev;
	}

	video_set_drvdata(vfd, dev);
	snprintf(vfd->name, sizeof(vfd->name), "%s", vim2m_videodev.name);
	dev->vfd = vfd;
	v4l2_info(&dev->v4l2_dev,
			"Device registered as /dev/video%d\n", vfd->num);

	setup_timer(&dev->timer, device_isr, (long)dev);
	platform_set_drvdata(pdev, dev);

	dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
	if (IS_ERR(dev->m2m_dev)) {
		v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
		ret = PTR_ERR(dev->m2m_dev);
		goto err_m2m;
	}

	return 0;

err_m2m:
	v4l2_m2m_release(dev->m2m_dev);
	video_unregister_device(dev->vfd);
rel_vdev:
	video_device_release(vfd);
unreg_dev:
	v4l2_device_unregister(&dev->v4l2_dev);

	return ret;
}

static int vim2m_remove(struct platform_device *pdev)
{
	struct vim2m_dev *dev = platform_get_drvdata(pdev);

	v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_NAME);
	v4l2_m2m_release(dev->m2m_dev);
	del_timer_sync(&dev->timer);
	video_unregister_device(dev->vfd);
	v4l2_device_unregister(&dev->v4l2_dev);

	return 0;
}

static struct platform_driver vim2m_pdrv = {
	.probe		= vim2m_probe,
	.remove		= vim2m_remove,
	.driver		= {
		.name	= MEM2MEM_NAME,
	},
};

static void __exit vim2m_exit(void)
{
	platform_driver_unregister(&vim2m_pdrv);
	platform_device_unregister(&vim2m_pdev);
}

static int __init vim2m_init(void)
{
	int ret;

	ret = platform_device_register(&vim2m_pdev);
	if (ret)
		return ret;

	ret = platform_driver_register(&vim2m_pdrv);
	if (ret)
		platform_device_unregister(&vim2m_pdev);

	return 0;
}

module_init(vim2m_init);
module_exit(vim2m_exit);