summaryrefslogtreecommitdiff
path: root/drivers/media/video/s5p-fimc/fimc-capture.c
blob: 81b4a826ee5e3338d25910d52e498c0cd0779a1f (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
/*
 * Samsung S5P/EXYNOS4 SoC series camera interface (camera capture) driver
 *
 * Copyright (C) 2010 - 2011 Samsung Electronics Co., Ltd.
 * Author: Sylwester Nawrocki, <s.nawrocki@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/i2c.h>

#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>

#include "fimc-core.h"

static struct v4l2_subdev *fimc_subdev_register(struct fimc_dev *fimc,
					    struct s5p_fimc_isp_info *isp_info)
{
	struct i2c_adapter *i2c_adap;
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct v4l2_subdev *sd = NULL;

	i2c_adap = i2c_get_adapter(isp_info->i2c_bus_num);
	if (!i2c_adap)
		return ERR_PTR(-ENOMEM);

	sd = v4l2_i2c_new_subdev_board(&vid_cap->v4l2_dev, i2c_adap,
				       isp_info->board_info, NULL);
	if (!sd) {
		v4l2_err(&vid_cap->v4l2_dev, "failed to acquire subdev\n");
		return NULL;
	}

	v4l2_info(&vid_cap->v4l2_dev, "subdevice %s registered successfuly\n",
		isp_info->board_info->type);

	return sd;
}

static void fimc_subdev_unregister(struct fimc_dev *fimc)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct i2c_client *client;

	if (vid_cap->input_index < 0)
		return;	/* Subdevice already released or not registered. */

	if (vid_cap->sd) {
		v4l2_device_unregister_subdev(vid_cap->sd);
		client = v4l2_get_subdevdata(vid_cap->sd);
		i2c_unregister_device(client);
		i2c_put_adapter(client->adapter);
		vid_cap->sd = NULL;
	}

	vid_cap->input_index = -1;
}

/**
 * fimc_subdev_attach - attach v4l2_subdev to camera host interface
 *
 * @fimc: FIMC device information
 * @index: index to the array of available subdevices,
 *	   -1 for full array search or non negative value
 *	   to select specific subdevice
 */
static int fimc_subdev_attach(struct fimc_dev *fimc, int index)
{
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	struct s5p_platform_fimc *pdata = fimc->pdata;
	struct s5p_fimc_isp_info *isp_info;
	struct v4l2_subdev *sd;
	int i;

	for (i = 0; i < pdata->num_clients; ++i) {
		isp_info = &pdata->isp_info[i];

		if (index >= 0 && i != index)
			continue;

		sd = fimc_subdev_register(fimc, isp_info);
		if (!IS_ERR_OR_NULL(sd)) {
			vid_cap->sd = sd;
			vid_cap->input_index = i;

			return 0;
		}
	}

	vid_cap->input_index = -1;
	vid_cap->sd = NULL;
	v4l2_err(&vid_cap->v4l2_dev, "fimc%d: sensor attach failed\n",
		 fimc->id);
	return -ENODEV;
}

static int fimc_isp_subdev_init(struct fimc_dev *fimc, unsigned int index)
{
	struct s5p_fimc_isp_info *isp_info;
	struct s5p_platform_fimc *pdata = fimc->pdata;
	int ret;

	if (index >= pdata->num_clients)
		return -EINVAL;

	isp_info = &pdata->isp_info[index];

	if (isp_info->clk_frequency)
		clk_set_rate(fimc->clock[CLK_CAM], isp_info->clk_frequency);

	ret = clk_enable(fimc->clock[CLK_CAM]);
	if (ret)
		return ret;

	ret = fimc_subdev_attach(fimc, index);
	if (ret)
		return ret;

	ret = fimc_hw_set_camera_polarity(fimc, isp_info);
	if (ret)
		return ret;

	ret = v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 1);
	if (!ret)
		return ret;

	/* enabling power failed so unregister subdev */
	fimc_subdev_unregister(fimc);

	v4l2_err(&fimc->vid_cap.v4l2_dev, "ISP initialization failed: %d\n",
		 ret);

	return ret;
}

static int fimc_stop_capture(struct fimc_dev *fimc)
{
	unsigned long flags;
	struct fimc_vid_cap *cap;
	struct fimc_vid_buffer *buf;

	cap = &fimc->vid_cap;

	if (!fimc_capture_active(fimc))
		return 0;

	spin_lock_irqsave(&fimc->slock, flags);
	set_bit(ST_CAPT_SHUT, &fimc->state);
	fimc_deactivate_capture(fimc);
	spin_unlock_irqrestore(&fimc->slock, flags);

	wait_event_timeout(fimc->irq_queue,
			   !test_bit(ST_CAPT_SHUT, &fimc->state),
			   FIMC_SHUTDOWN_TIMEOUT);

	v4l2_subdev_call(cap->sd, video, s_stream, 0);

	spin_lock_irqsave(&fimc->slock, flags);
	fimc->state &= ~(1 << ST_CAPT_RUN | 1 << ST_CAPT_PEND |
			 1 << ST_CAPT_SHUT | 1 << ST_CAPT_STREAM);

	fimc->vid_cap.active_buf_cnt = 0;

	/* Release buffers that were enqueued in the driver by videobuf2. */
	while (!list_empty(&cap->pending_buf_q)) {
		buf = pending_queue_pop(cap);
		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
	}

	while (!list_empty(&cap->active_buf_q)) {
		buf = active_queue_pop(cap);
		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
	}

	spin_unlock_irqrestore(&fimc->slock, flags);

	dbg("state: 0x%lx", fimc->state);
	return 0;
}

static int start_streaming(struct vb2_queue *q)
{
	struct fimc_ctx *ctx = q->drv_priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct s5p_fimc_isp_info *isp_info;
	int ret;

	fimc_hw_reset(fimc);

	ret = v4l2_subdev_call(fimc->vid_cap.sd, video, s_stream, 1);
	if (ret && ret != -ENOIOCTLCMD)
		return ret;

	ret = fimc_prepare_config(ctx, ctx->state);
	if (ret)
		return ret;

	isp_info = &fimc->pdata->isp_info[fimc->vid_cap.input_index];
	fimc_hw_set_camera_type(fimc, isp_info);
	fimc_hw_set_camera_source(fimc, isp_info);
	fimc_hw_set_camera_offset(fimc, &ctx->s_frame);

	if (ctx->state & FIMC_PARAMS) {
		ret = fimc_set_scaler_info(ctx);
		if (ret) {
			err("Scaler setup error");
			return ret;
		}
		fimc_hw_set_input_path(ctx);
		fimc_hw_set_prescaler(ctx);
		fimc_hw_set_mainscaler(ctx);
		fimc_hw_set_target_format(ctx);
		fimc_hw_set_rotation(ctx);
		fimc_hw_set_effect(ctx);
	}

	fimc_hw_set_output_path(ctx);
	fimc_hw_set_out_dma(ctx);

	INIT_LIST_HEAD(&fimc->vid_cap.pending_buf_q);
	INIT_LIST_HEAD(&fimc->vid_cap.active_buf_q);
	fimc->vid_cap.active_buf_cnt = 0;
	fimc->vid_cap.frame_count = 0;
	fimc->vid_cap.buf_index = 0;

	set_bit(ST_CAPT_PEND, &fimc->state);

	return 0;
}

static int stop_streaming(struct vb2_queue *q)
{
	struct fimc_ctx *ctx = q->drv_priv;
	struct fimc_dev *fimc = ctx->fimc_dev;

	if (!fimc_capture_active(fimc))
		return -EINVAL;

	return fimc_stop_capture(fimc);
}

static unsigned int get_plane_size(struct fimc_frame *fr, unsigned int plane)
{
	if (!fr || plane >= fr->fmt->memplanes)
		return 0;
	return fr->f_width * fr->f_height * fr->fmt->depth[plane] / 8;
}

static int queue_setup(struct vb2_queue *vq, unsigned int *num_buffers,
		       unsigned int *num_planes, unsigned long sizes[],
		       void *allocators[])
{
	struct fimc_ctx *ctx = vq->drv_priv;
	struct fimc_fmt *fmt = ctx->d_frame.fmt;
	int i;

	if (!fmt)
		return -EINVAL;

	*num_planes = fmt->memplanes;

	for (i = 0; i < fmt->memplanes; i++) {
		sizes[i] = get_plane_size(&ctx->d_frame, i);
		allocators[i] = ctx->fimc_dev->alloc_ctx;
	}

	return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
	struct vb2_queue *vq = vb->vb2_queue;
	struct fimc_ctx *ctx = vq->drv_priv;
	struct v4l2_device *v4l2_dev = &ctx->fimc_dev->m2m.v4l2_dev;
	int i;

	if (!ctx->d_frame.fmt || vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
		return -EINVAL;

	for (i = 0; i < ctx->d_frame.fmt->memplanes; i++) {
		unsigned long size = get_plane_size(&ctx->d_frame, i);

		if (vb2_plane_size(vb, i) < size) {
			v4l2_err(v4l2_dev, "User buffer too small (%ld < %ld)\n",
				 vb2_plane_size(vb, i), size);
			return -EINVAL;
		}

		vb2_set_plane_payload(vb, i, size);
	}

	return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
	struct fimc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_vid_buffer *buf
		= container_of(vb, struct fimc_vid_buffer, vb);
	struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
	unsigned long flags;
	int min_bufs;

	spin_lock_irqsave(&fimc->slock, flags);
	fimc_prepare_addr(ctx, &buf->vb, &ctx->d_frame, &buf->paddr);

	if (!test_bit(ST_CAPT_STREAM, &fimc->state)
	     && vid_cap->active_buf_cnt < FIMC_MAX_OUT_BUFS) {
		/* Setup the buffer directly for processing. */
		int buf_id = (vid_cap->reqbufs_count == 1) ? -1 :
				vid_cap->buf_index;

		fimc_hw_set_output_addr(fimc, &buf->paddr, buf_id);
		buf->index = vid_cap->buf_index;
		active_queue_add(vid_cap, buf);

		if (++vid_cap->buf_index >= FIMC_MAX_OUT_BUFS)
			vid_cap->buf_index = 0;
	} else {
		fimc_pending_queue_add(vid_cap, buf);
	}

	min_bufs = vid_cap->reqbufs_count > 1 ? 2 : 1;

	if (vid_cap->active_buf_cnt >= min_bufs &&
	    !test_and_set_bit(ST_CAPT_STREAM, &fimc->state))
		fimc_activate_capture(ctx);

	spin_unlock_irqrestore(&fimc->slock, flags);
}

static void fimc_lock(struct vb2_queue *vq)
{
	struct fimc_ctx *ctx = vb2_get_drv_priv(vq);
	mutex_lock(&ctx->fimc_dev->lock);
}

static void fimc_unlock(struct vb2_queue *vq)
{
	struct fimc_ctx *ctx = vb2_get_drv_priv(vq);
	mutex_unlock(&ctx->fimc_dev->lock);
}

static struct vb2_ops fimc_capture_qops = {
	.queue_setup		= queue_setup,
	.buf_prepare		= buffer_prepare,
	.buf_queue		= buffer_queue,
	.wait_prepare		= fimc_unlock,
	.wait_finish		= fimc_lock,
	.start_streaming	= start_streaming,
	.stop_streaming		= stop_streaming,
};

static int fimc_capture_open(struct file *file)
{
	struct fimc_dev *fimc = video_drvdata(file);
	int ret = 0;

	dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

	/* Return if the corresponding video mem2mem node is already opened. */
	if (fimc_m2m_active(fimc))
		return -EBUSY;

	if (++fimc->vid_cap.refcnt == 1) {
		ret = fimc_isp_subdev_init(fimc, 0);
		if (ret) {
			fimc->vid_cap.refcnt--;
			return -EIO;
		}
	}

	file->private_data = fimc->vid_cap.ctx;

	return 0;
}

static int fimc_capture_close(struct file *file)
{
	struct fimc_dev *fimc = video_drvdata(file);

	dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

	if (--fimc->vid_cap.refcnt == 0) {
		fimc_stop_capture(fimc);
		vb2_queue_release(&fimc->vid_cap.vbq);

		v4l2_err(&fimc->vid_cap.v4l2_dev, "releasing ISP\n");

		v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 0);
		clk_disable(fimc->clock[CLK_CAM]);
		fimc_subdev_unregister(fimc);
	}

	return 0;
}

static unsigned int fimc_capture_poll(struct file *file,
				      struct poll_table_struct *wait)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;

	return vb2_poll(&fimc->vid_cap.vbq, file, wait);
}

static int fimc_capture_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;

	return vb2_mmap(&fimc->vid_cap.vbq, vma);
}

/* video device file operations */
static const struct v4l2_file_operations fimc_capture_fops = {
	.owner		= THIS_MODULE,
	.open		= fimc_capture_open,
	.release	= fimc_capture_close,
	.poll		= fimc_capture_poll,
	.unlocked_ioctl	= video_ioctl2,
	.mmap		= fimc_capture_mmap,
};

static int fimc_vidioc_querycap_capture(struct file *file, void *priv,
					struct v4l2_capability *cap)
{
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;

	strncpy(cap->driver, fimc->pdev->name, sizeof(cap->driver) - 1);
	strncpy(cap->card, fimc->pdev->name, sizeof(cap->card) - 1);
	cap->bus_info[0] = 0;
	cap->version = KERNEL_VERSION(1, 0, 0);
	cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE |
			    V4L2_CAP_VIDEO_CAPTURE_MPLANE;

	return 0;
}

/* Synchronize formats of the camera interface input and attached  sensor. */
static int sync_capture_fmt(struct fimc_ctx *ctx)
{
	struct fimc_frame *frame = &ctx->s_frame;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct v4l2_mbus_framefmt *fmt = &fimc->vid_cap.fmt;
	int ret;

	fmt->width  = ctx->d_frame.o_width;
	fmt->height = ctx->d_frame.o_height;

	ret = v4l2_subdev_call(fimc->vid_cap.sd, video, s_mbus_fmt, fmt);
	if (ret == -ENOIOCTLCMD) {
		err("s_mbus_fmt failed");
		return ret;
	}
	dbg("w: %d, h: %d, code= %d", fmt->width, fmt->height, fmt->code);

	frame->fmt = find_mbus_format(fmt, FMT_FLAGS_CAM);
	if (!frame->fmt) {
		err("fimc source format not found\n");
		return -EINVAL;
	}

	frame->f_width	= fmt->width;
	frame->f_height = fmt->height;
	frame->width	= fmt->width;
	frame->height	= fmt->height;
	frame->o_width	= fmt->width;
	frame->o_height = fmt->height;
	frame->offs_h	= 0;
	frame->offs_v	= 0;

	return 0;
}

static int fimc_cap_s_fmt_mplane(struct file *file, void *priv,
				 struct v4l2_format *f)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct fimc_frame *frame;
	struct v4l2_pix_format_mplane *pix;
	int ret;
	int i;

	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
		return -EINVAL;

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

	if (vb2_is_busy(&fimc->vid_cap.vbq) || fimc_capture_active(fimc))
		return -EBUSY;

	frame = &ctx->d_frame;

	pix = &f->fmt.pix_mp;
	frame->fmt = find_format(f, FMT_FLAGS_M2M | FMT_FLAGS_CAM);
	if (!frame->fmt) {
		err("fimc target format not found\n");
		return -EINVAL;
	}

	for (i = 0; i < frame->fmt->colplanes; i++) {
		frame->payload[i] =
			(pix->width * pix->height * frame->fmt->depth[i]) >> 3;
	}

	/* Output DMA frame pixel size and offsets. */
	frame->f_width = pix->plane_fmt[0].bytesperline * 8
			/ frame->fmt->depth[0];
	frame->f_height = pix->height;
	frame->width	= pix->width;
	frame->height	= pix->height;
	frame->o_width	= pix->width;
	frame->o_height = pix->height;
	frame->offs_h	= 0;
	frame->offs_v	= 0;

	ctx->state |= (FIMC_PARAMS | FIMC_DST_FMT);

	ret = sync_capture_fmt(ctx);
	return ret;
}

static int fimc_cap_enum_input(struct file *file, void *priv,
				     struct v4l2_input *i)
{
	struct fimc_ctx *ctx = priv;
	struct s5p_platform_fimc *pldata = ctx->fimc_dev->pdata;
	struct s5p_fimc_isp_info *isp_info;

	if (i->index >= pldata->num_clients)
		return -EINVAL;

	isp_info = &pldata->isp_info[i->index];

	i->type = V4L2_INPUT_TYPE_CAMERA;
	strncpy(i->name, isp_info->board_info->type, 32);
	return 0;
}

static int fimc_cap_s_input(struct file *file, void *priv,
				  unsigned int i)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;
	struct s5p_platform_fimc *pdata = fimc->pdata;

	if (fimc_capture_active(ctx->fimc_dev))
		return -EBUSY;

	if (i >= pdata->num_clients)
		return -EINVAL;


	if (fimc->vid_cap.sd) {
		int ret = v4l2_subdev_call(fimc->vid_cap.sd, core, s_power, 0);
		if (ret)
			err("s_power failed: %d", ret);

		clk_disable(fimc->clock[CLK_CAM]);
	}

	/* Release the attached sensor subdevice. */
	fimc_subdev_unregister(fimc);

	return fimc_isp_subdev_init(fimc, i);
}

static int fimc_cap_g_input(struct file *file, void *priv,
				       unsigned int *i)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;

	*i = cap->input_index;
	return 0;
}

static int fimc_cap_streamon(struct file *file, void *priv,
			     enum v4l2_buf_type type)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;

	if (fimc_capture_active(fimc) || !fimc->vid_cap.sd)
		return -EBUSY;

	if (!(ctx->state & FIMC_DST_FMT)) {
		v4l2_err(&fimc->vid_cap.v4l2_dev, "Format is not set\n");
		return -EINVAL;
	}

	return vb2_streamon(&fimc->vid_cap.vbq, type);
}

static int fimc_cap_streamoff(struct file *file, void *priv,
			    enum v4l2_buf_type type)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_dev *fimc = ctx->fimc_dev;

	return vb2_streamoff(&fimc->vid_cap.vbq, type);
}

static int fimc_cap_reqbufs(struct file *file, void *priv,
			    struct v4l2_requestbuffers *reqbufs)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;
	int ret;


	ret = vb2_reqbufs(&cap->vbq, reqbufs);
	if (!ret)
		cap->reqbufs_count = reqbufs->count;

	return ret;
}

static int fimc_cap_querybuf(struct file *file, void *priv,
			   struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;

	return vb2_querybuf(&cap->vbq, buf);
}

static int fimc_cap_qbuf(struct file *file, void *priv,
			  struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	struct fimc_vid_cap *cap = &ctx->fimc_dev->vid_cap;
	return vb2_qbuf(&cap->vbq, buf);
}

static int fimc_cap_dqbuf(struct file *file, void *priv,
			   struct v4l2_buffer *buf)
{
	struct fimc_ctx *ctx = priv;
	return vb2_dqbuf(&ctx->fimc_dev->vid_cap.vbq, buf,
		file->f_flags & O_NONBLOCK);
}

static int fimc_cap_s_ctrl(struct file *file, void *priv,
			 struct v4l2_control *ctrl)
{
	struct fimc_ctx *ctx = priv;
	int ret = -EINVAL;

	/* Allow any controls but 90/270 rotation while streaming */
	if (!fimc_capture_active(ctx->fimc_dev) ||
	    ctrl->id != V4L2_CID_ROTATE ||
	    (ctrl->value != 90 && ctrl->value != 270)) {
		ret = check_ctrl_val(ctx, ctrl);
		if (!ret) {
			ret = fimc_s_ctrl(ctx, ctrl);
			if (!ret)
				ctx->state |= FIMC_PARAMS;
		}
	}
	if (ret == -EINVAL)
		ret = v4l2_subdev_call(ctx->fimc_dev->vid_cap.sd,
				       core, s_ctrl, ctrl);
	return ret;
}

static int fimc_cap_cropcap(struct file *file, void *fh,
			    struct v4l2_cropcap *cr)
{
	struct fimc_frame *f;
	struct fimc_ctx *ctx = fh;

	if (cr->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
		return -EINVAL;

	f = &ctx->s_frame;

	cr->bounds.left		= 0;
	cr->bounds.top		= 0;
	cr->bounds.width	= f->o_width;
	cr->bounds.height	= f->o_height;
	cr->defrect		= cr->bounds;

	return 0;
}

static int fimc_cap_g_crop(struct file *file, void *fh, struct v4l2_crop *cr)
{
	struct fimc_frame *f;
	struct fimc_ctx *ctx = file->private_data;

	f = &ctx->s_frame;

	cr->c.left	= f->offs_h;
	cr->c.top	= f->offs_v;
	cr->c.width	= f->width;
	cr->c.height	= f->height;

	return 0;
}

static int fimc_cap_s_crop(struct file *file, void *fh,
			       struct v4l2_crop *cr)
{
	struct fimc_frame *f;
	struct fimc_ctx *ctx = file->private_data;
	struct fimc_dev *fimc = ctx->fimc_dev;
	int ret = -EINVAL;

	if (fimc_capture_active(fimc))
		return -EBUSY;

	ret = fimc_try_crop(ctx, cr);
	if (ret)
		return ret;

	if (!(ctx->state & FIMC_DST_FMT)) {
		v4l2_err(&fimc->vid_cap.v4l2_dev,
			 "Capture color format not set\n");
		return -EINVAL; /* TODO: make sure this is the right value */
	}

	f = &ctx->s_frame;
	/* Check for the pixel scaling ratio when cropping input image. */
	ret = fimc_check_scaler_ratio(cr->c.width, cr->c.height,
				      ctx->d_frame.width, ctx->d_frame.height,
				      ctx->rotation);
	if (ret) {
		v4l2_err(&fimc->vid_cap.v4l2_dev, "Out of the scaler range\n");
		return ret;
	}

	f->offs_h = cr->c.left;
	f->offs_v = cr->c.top;
	f->width  = cr->c.width;
	f->height = cr->c.height;

	return 0;
}


static const struct v4l2_ioctl_ops fimc_capture_ioctl_ops = {
	.vidioc_querycap		= fimc_vidioc_querycap_capture,

	.vidioc_enum_fmt_vid_cap_mplane	= fimc_vidioc_enum_fmt_mplane,
	.vidioc_try_fmt_vid_cap_mplane	= fimc_vidioc_try_fmt_mplane,
	.vidioc_s_fmt_vid_cap_mplane	= fimc_cap_s_fmt_mplane,
	.vidioc_g_fmt_vid_cap_mplane	= fimc_vidioc_g_fmt_mplane,

	.vidioc_reqbufs			= fimc_cap_reqbufs,
	.vidioc_querybuf		= fimc_cap_querybuf,

	.vidioc_qbuf			= fimc_cap_qbuf,
	.vidioc_dqbuf			= fimc_cap_dqbuf,

	.vidioc_streamon		= fimc_cap_streamon,
	.vidioc_streamoff		= fimc_cap_streamoff,

	.vidioc_queryctrl		= fimc_vidioc_queryctrl,
	.vidioc_g_ctrl			= fimc_vidioc_g_ctrl,
	.vidioc_s_ctrl			= fimc_cap_s_ctrl,

	.vidioc_g_crop			= fimc_cap_g_crop,
	.vidioc_s_crop			= fimc_cap_s_crop,
	.vidioc_cropcap			= fimc_cap_cropcap,

	.vidioc_enum_input		= fimc_cap_enum_input,
	.vidioc_s_input			= fimc_cap_s_input,
	.vidioc_g_input			= fimc_cap_g_input,
};

/* fimc->lock must be already initialized */
int fimc_register_capture_device(struct fimc_dev *fimc)
{
	struct v4l2_device *v4l2_dev = &fimc->vid_cap.v4l2_dev;
	struct video_device *vfd;
	struct fimc_vid_cap *vid_cap;
	struct fimc_ctx *ctx;
	struct v4l2_format f;
	struct fimc_frame *fr;
	struct vb2_queue *q;
	int ret;

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

	ctx->fimc_dev	 = fimc;
	ctx->in_path	 = FIMC_CAMERA;
	ctx->out_path	 = FIMC_DMA;
	ctx->state	 = FIMC_CTX_CAP;

	/* Default format of the output frames */
	f.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
	fr = &ctx->d_frame;
	fr->fmt = find_format(&f, FMT_FLAGS_M2M);
	fr->width = fr->f_width = fr->o_width = 640;
	fr->height = fr->f_height = fr->o_height = 480;

	if (!v4l2_dev->name[0])
		snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
			 "%s.capture", dev_name(&fimc->pdev->dev));

	ret = v4l2_device_register(NULL, v4l2_dev);
	if (ret)
		goto err_info;

	vfd = video_device_alloc();
	if (!vfd) {
		v4l2_err(v4l2_dev, "Failed to allocate video device\n");
		goto err_v4l2_reg;
	}

	snprintf(vfd->name, sizeof(vfd->name), "%s:cap",
		 dev_name(&fimc->pdev->dev));

	vfd->fops	= &fimc_capture_fops;
	vfd->ioctl_ops	= &fimc_capture_ioctl_ops;
	vfd->minor	= -1;
	vfd->release	= video_device_release;
	vfd->lock	= &fimc->lock;
	video_set_drvdata(vfd, fimc);

	vid_cap = &fimc->vid_cap;
	vid_cap->vfd = vfd;
	vid_cap->active_buf_cnt = 0;
	vid_cap->reqbufs_count  = 0;
	vid_cap->refcnt = 0;
	/* Default color format for image sensor */
	vid_cap->fmt.code = V4L2_MBUS_FMT_YUYV8_2X8;

	INIT_LIST_HEAD(&vid_cap->pending_buf_q);
	INIT_LIST_HEAD(&vid_cap->active_buf_q);
	spin_lock_init(&ctx->slock);
	vid_cap->ctx = ctx;

	q = &fimc->vid_cap.vbq;
	memset(q, 0, sizeof(*q));
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
	q->io_modes = VB2_MMAP | VB2_USERPTR;
	q->drv_priv = fimc->vid_cap.ctx;
	q->ops = &fimc_capture_qops;
	q->mem_ops = &vb2_dma_contig_memops;
	q->buf_struct_size = sizeof(struct fimc_vid_buffer);

	vb2_queue_init(q);

	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
	if (ret) {
		v4l2_err(v4l2_dev, "Failed to register video device\n");
		goto err_vd_reg;
	}

	v4l2_info(v4l2_dev,
		  "FIMC capture driver registered as /dev/video%d\n",
		  vfd->num);

	return 0;

err_vd_reg:
	video_device_release(vfd);
err_v4l2_reg:
	v4l2_device_unregister(v4l2_dev);
err_info:
	kfree(ctx);
	dev_err(&fimc->pdev->dev, "failed to install\n");
	return ret;
}

void fimc_unregister_capture_device(struct fimc_dev *fimc)
{
	struct fimc_vid_cap *capture = &fimc->vid_cap;

	if (capture->vfd)
		video_unregister_device(capture->vfd);

	kfree(capture->ctx);
}