summaryrefslogtreecommitdiff
path: root/drivers/media/video/omap3isp/ispvideo.c
blob: 0cb8a9f9d675ddbd9e460b2a8143ea81fb47a105 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
/*
 * ispvideo.c
 *
 * TI OMAP3 ISP - Generic video node
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *	     Sakari Ailus <sakari.ailus@iki.fi>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <asm/cacheflush.h>
#include <linux/clk.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-ioctl.h>
#include <plat/iommu.h>
#include <plat/iovmm.h>
#include <plat/omap-pm.h>

#include "ispvideo.h"
#include "isp.h"


/* -----------------------------------------------------------------------------
 * Helper functions
 */

static struct isp_format_info formats[] = {
	{ V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
	  V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
	  V4L2_PIX_FMT_GREY, 8, },
	{ V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y10_1X10,
	  V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y8_1X8,
	  V4L2_PIX_FMT_Y10, 10, },
	{ V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y10_1X10,
	  V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y8_1X8,
	  V4L2_PIX_FMT_Y12, 12, },
	{ V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
	  V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
	  V4L2_PIX_FMT_SBGGR8, 8, },
	{ V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
	  V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
	  V4L2_PIX_FMT_SGBRG8, 8, },
	{ V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
	  V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
	  V4L2_PIX_FMT_SGRBG8, 8, },
	{ V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
	  V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
	  V4L2_PIX_FMT_SRGGB8, 8, },
	{ V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8, V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8,
	  V4L2_MBUS_FMT_SGRBG10_1X10, 0,
	  V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
	{ V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR10_1X10,
	  V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR8_1X8,
	  V4L2_PIX_FMT_SBGGR10, 10, },
	{ V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG10_1X10,
	  V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG8_1X8,
	  V4L2_PIX_FMT_SGBRG10, 10, },
	{ V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG10_1X10,
	  V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG8_1X8,
	  V4L2_PIX_FMT_SGRBG10, 10, },
	{ V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB10_1X10,
	  V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB8_1X8,
	  V4L2_PIX_FMT_SRGGB10, 10, },
	{ V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR10_1X10,
	  V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR8_1X8,
	  V4L2_PIX_FMT_SBGGR12, 12, },
	{ V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG10_1X10,
	  V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG8_1X8,
	  V4L2_PIX_FMT_SGBRG12, 12, },
	{ V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG10_1X10,
	  V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG8_1X8,
	  V4L2_PIX_FMT_SGRBG12, 12, },
	{ V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB10_1X10,
	  V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB8_1X8,
	  V4L2_PIX_FMT_SRGGB12, 12, },
	{ V4L2_MBUS_FMT_UYVY8_1X16, V4L2_MBUS_FMT_UYVY8_1X16,
	  V4L2_MBUS_FMT_UYVY8_1X16, 0,
	  V4L2_PIX_FMT_UYVY, 16, },
	{ V4L2_MBUS_FMT_YUYV8_1X16, V4L2_MBUS_FMT_YUYV8_1X16,
	  V4L2_MBUS_FMT_YUYV8_1X16, 0,
	  V4L2_PIX_FMT_YUYV, 16, },
};

const struct isp_format_info *
omap3isp_video_format_info(enum v4l2_mbus_pixelcode code)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
		if (formats[i].code == code)
			return &formats[i];
	}

	return NULL;
}

/*
 * Decide whether desired output pixel code can be obtained with
 * the lane shifter by shifting the input pixel code.
 * @in: input pixelcode to shifter
 * @out: output pixelcode from shifter
 * @additional_shift: # of bits the sensor's LSB is offset from CAMEXT[0]
 *
 * return true if the combination is possible
 * return false otherwise
 */
static bool isp_video_is_shiftable(enum v4l2_mbus_pixelcode in,
		enum v4l2_mbus_pixelcode out,
		unsigned int additional_shift)
{
	const struct isp_format_info *in_info, *out_info;

	if (in == out)
		return true;

	in_info = omap3isp_video_format_info(in);
	out_info = omap3isp_video_format_info(out);

	if ((in_info->flavor == 0) || (out_info->flavor == 0))
		return false;

	if (in_info->flavor != out_info->flavor)
		return false;

	return in_info->bpp - out_info->bpp + additional_shift <= 6;
}

/*
 * isp_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 * @video: ISP video instance
 * @mbus: v4l2_mbus_framefmt format (input)
 * @pix: v4l2_pix_format format (output)
 *
 * Fill the output pix structure with information from the input mbus format.
 * The bytesperline and sizeimage fields are computed from the requested bytes
 * per line value in the pix format and information from the video instance.
 *
 * Return the number of padding bytes at end of line.
 */
static unsigned int isp_video_mbus_to_pix(const struct isp_video *video,
					  const struct v4l2_mbus_framefmt *mbus,
					  struct v4l2_pix_format *pix)
{
	unsigned int bpl = pix->bytesperline;
	unsigned int min_bpl;
	unsigned int i;

	memset(pix, 0, sizeof(*pix));
	pix->width = mbus->width;
	pix->height = mbus->height;

	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
		if (formats[i].code == mbus->code)
			break;
	}

	if (WARN_ON(i == ARRAY_SIZE(formats)))
		return 0;

	min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;

	/* Clamp the requested bytes per line value. If the maximum bytes per
	 * line value is zero, the module doesn't support user configurable line
	 * sizes. Override the requested value with the minimum in that case.
	 */
	if (video->bpl_max)
		bpl = clamp(bpl, min_bpl, video->bpl_max);
	else
		bpl = min_bpl;

	if (!video->bpl_zero_padding || bpl != min_bpl)
		bpl = ALIGN(bpl, video->bpl_alignment);

	pix->pixelformat = formats[i].pixelformat;
	pix->bytesperline = bpl;
	pix->sizeimage = pix->bytesperline * pix->height;
	pix->colorspace = mbus->colorspace;
	pix->field = mbus->field;

	return bpl - min_bpl;
}

static void isp_video_pix_to_mbus(const struct v4l2_pix_format *pix,
				  struct v4l2_mbus_framefmt *mbus)
{
	unsigned int i;

	memset(mbus, 0, sizeof(*mbus));
	mbus->width = pix->width;
	mbus->height = pix->height;

	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
		if (formats[i].pixelformat == pix->pixelformat)
			break;
	}

	if (WARN_ON(i == ARRAY_SIZE(formats)))
		return;

	mbus->code = formats[i].code;
	mbus->colorspace = pix->colorspace;
	mbus->field = pix->field;
}

static struct v4l2_subdev *
isp_video_remote_subdev(struct isp_video *video, u32 *pad)
{
	struct media_pad *remote;

	remote = media_entity_remote_source(&video->pad);

	if (remote == NULL ||
	    media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
		return NULL;

	if (pad)
		*pad = remote->index;

	return media_entity_to_v4l2_subdev(remote->entity);
}

/* Return a pointer to the ISP video instance at the far end of the pipeline. */
static struct isp_video *
isp_video_far_end(struct isp_video *video)
{
	struct media_entity_graph graph;
	struct media_entity *entity = &video->video.entity;
	struct media_device *mdev = entity->parent;
	struct isp_video *far_end = NULL;

	mutex_lock(&mdev->graph_mutex);
	media_entity_graph_walk_start(&graph, entity);

	while ((entity = media_entity_graph_walk_next(&graph))) {
		if (entity == &video->video.entity)
			continue;

		if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
			continue;

		far_end = to_isp_video(media_entity_to_video_device(entity));
		if (far_end->type != video->type)
			break;

		far_end = NULL;
	}

	mutex_unlock(&mdev->graph_mutex);
	return far_end;
}

/*
 * Validate a pipeline by checking both ends of all links for format
 * discrepancies.
 *
 * Compute the minimum time per frame value as the maximum of time per frame
 * limits reported by every block in the pipeline.
 *
 * Return 0 if all formats match, or -EPIPE if at least one link is found with
 * different formats on its two ends or if the pipeline doesn't start with a
 * video source (either a subdev with no input pad, or a non-subdev entity).
 */
static int isp_video_validate_pipeline(struct isp_pipeline *pipe)
{
	struct isp_device *isp = pipe->output->isp;
	struct v4l2_subdev_format fmt_source;
	struct v4l2_subdev_format fmt_sink;
	struct media_pad *pad;
	struct v4l2_subdev *subdev;
	int ret;

	pipe->max_rate = pipe->l3_ick;

	subdev = isp_video_remote_subdev(pipe->output, NULL);
	if (subdev == NULL)
		return -EPIPE;

	while (1) {
		unsigned int shifter_link;
		/* Retrieve the sink format */
		pad = &subdev->entity.pads[0];
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		fmt_sink.pad = pad->index;
		fmt_sink.which = V4L2_SUBDEV_FORMAT_ACTIVE;
		ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt_sink);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return -EPIPE;

		/* Update the maximum frame rate */
		if (subdev == &isp->isp_res.subdev)
			omap3isp_resizer_max_rate(&isp->isp_res,
						  &pipe->max_rate);

		/* Check ccdc maximum data rate when data comes from sensor
		 * TODO: Include ccdc rate in pipe->max_rate and compare the
		 *       total pipe rate with the input data rate from sensor.
		 */
		if (subdev == &isp->isp_ccdc.subdev && pipe->input == NULL) {
			unsigned int rate = UINT_MAX;

			omap3isp_ccdc_max_rate(&isp->isp_ccdc, &rate);
			if (isp->isp_ccdc.vpcfg.pixelclk > rate)
				return -ENOSPC;
		}

		/* If sink pad is on CCDC, the link has the lane shifter
		 * in the middle of it. */
		shifter_link = subdev == &isp->isp_ccdc.subdev;

		/* Retrieve the source format. Return an error if no source
		 * entity can be found, and stop checking the pipeline if the
		 * source entity isn't a subdev.
		 */
		pad = media_entity_remote_source(pad);
		if (pad == NULL)
			return -EPIPE;

		if (media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
			break;

		subdev = media_entity_to_v4l2_subdev(pad->entity);

		fmt_source.pad = pad->index;
		fmt_source.which = V4L2_SUBDEV_FORMAT_ACTIVE;
		ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt_source);
		if (ret < 0 && ret != -ENOIOCTLCMD)
			return -EPIPE;

		/* Check if the two ends match */
		if (fmt_source.format.width != fmt_sink.format.width ||
		    fmt_source.format.height != fmt_sink.format.height)
			return -EPIPE;

		if (shifter_link) {
			unsigned int parallel_shift = 0;
			if (isp->isp_ccdc.input == CCDC_INPUT_PARALLEL) {
				struct isp_parallel_platform_data *pdata =
					&((struct isp_v4l2_subdevs_group *)
					      subdev->host_priv)->bus.parallel;
				parallel_shift = pdata->data_lane_shift * 2;
			}
			if (!isp_video_is_shiftable(fmt_source.format.code,
						fmt_sink.format.code,
						parallel_shift))
				return -EPIPE;
		} else if (fmt_source.format.code != fmt_sink.format.code)
			return -EPIPE;
	}

	return 0;
}

static int
__isp_video_get_format(struct isp_video *video, struct v4l2_format *format)
{
	struct v4l2_subdev_format fmt;
	struct v4l2_subdev *subdev;
	u32 pad;
	int ret;

	subdev = isp_video_remote_subdev(video, &pad);
	if (subdev == NULL)
		return -EINVAL;

	mutex_lock(&video->mutex);

	fmt.pad = pad;
	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
	if (ret == -ENOIOCTLCMD)
		ret = -EINVAL;

	mutex_unlock(&video->mutex);

	if (ret)
		return ret;

	format->type = video->type;
	return isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
}

static int
isp_video_check_format(struct isp_video *video, struct isp_video_fh *vfh)
{
	struct v4l2_format format;
	int ret;

	memcpy(&format, &vfh->format, sizeof(format));
	ret = __isp_video_get_format(video, &format);
	if (ret < 0)
		return ret;

	if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
	    vfh->format.fmt.pix.height != format.fmt.pix.height ||
	    vfh->format.fmt.pix.width != format.fmt.pix.width ||
	    vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
	    vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage)
		return -EINVAL;

	return ret;
}

/* -----------------------------------------------------------------------------
 * IOMMU management
 */

#define IOMMU_FLAG	(IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_8)

/*
 * ispmmu_vmap - Wrapper for Virtual memory mapping of a scatter gather list
 * @dev: Device pointer specific to the OMAP3 ISP.
 * @sglist: Pointer to source Scatter gather list to allocate.
 * @sglen: Number of elements of the scatter-gatter list.
 *
 * Returns a resulting mapped device address by the ISP MMU, or -ENOMEM if
 * we ran out of memory.
 */
static dma_addr_t
ispmmu_vmap(struct isp_device *isp, const struct scatterlist *sglist, int sglen)
{
	struct sg_table *sgt;
	u32 da;

	sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
	if (sgt == NULL)
		return -ENOMEM;

	sgt->sgl = (struct scatterlist *)sglist;
	sgt->nents = sglen;
	sgt->orig_nents = sglen;

	da = omap_iommu_vmap(isp->domain, isp->iommu, 0, sgt, IOMMU_FLAG);
	if (IS_ERR_VALUE(da))
		kfree(sgt);

	return da;
}

/*
 * ispmmu_vunmap - Unmap a device address from the ISP MMU
 * @dev: Device pointer specific to the OMAP3 ISP.
 * @da: Device address generated from a ispmmu_vmap call.
 */
static void ispmmu_vunmap(struct isp_device *isp, dma_addr_t da)
{
	struct sg_table *sgt;

	sgt = omap_iommu_vunmap(isp->domain, isp->iommu, (u32)da);
	kfree(sgt);
}

/* -----------------------------------------------------------------------------
 * Video queue operations
 */

static void isp_video_queue_prepare(struct isp_video_queue *queue,
				    unsigned int *nbuffers, unsigned int *size)
{
	struct isp_video_fh *vfh =
		container_of(queue, struct isp_video_fh, queue);
	struct isp_video *video = vfh->video;

	*size = vfh->format.fmt.pix.sizeimage;
	if (*size == 0)
		return;

	*nbuffers = min(*nbuffers, video->capture_mem / PAGE_ALIGN(*size));
}

static void isp_video_buffer_cleanup(struct isp_video_buffer *buf)
{
	struct isp_video_fh *vfh = isp_video_queue_to_isp_video_fh(buf->queue);
	struct isp_buffer *buffer = to_isp_buffer(buf);
	struct isp_video *video = vfh->video;

	if (buffer->isp_addr) {
		ispmmu_vunmap(video->isp, buffer->isp_addr);
		buffer->isp_addr = 0;
	}
}

static int isp_video_buffer_prepare(struct isp_video_buffer *buf)
{
	struct isp_video_fh *vfh = isp_video_queue_to_isp_video_fh(buf->queue);
	struct isp_buffer *buffer = to_isp_buffer(buf);
	struct isp_video *video = vfh->video;
	unsigned long addr;

	addr = ispmmu_vmap(video->isp, buf->sglist, buf->sglen);
	if (IS_ERR_VALUE(addr))
		return -EIO;

	if (!IS_ALIGNED(addr, 32)) {
		dev_dbg(video->isp->dev, "Buffer address must be "
			"aligned to 32 bytes boundary.\n");
		ispmmu_vunmap(video->isp, buffer->isp_addr);
		return -EINVAL;
	}

	buf->vbuf.bytesused = vfh->format.fmt.pix.sizeimage;
	buffer->isp_addr = addr;
	return 0;
}

/*
 * isp_video_buffer_queue - Add buffer to streaming queue
 * @buf: Video buffer
 *
 * In memory-to-memory mode, start streaming on the pipeline if buffers are
 * queued on both the input and the output, if the pipeline isn't already busy.
 * If the pipeline is busy, it will be restarted in the output module interrupt
 * handler.
 */
static void isp_video_buffer_queue(struct isp_video_buffer *buf)
{
	struct isp_video_fh *vfh = isp_video_queue_to_isp_video_fh(buf->queue);
	struct isp_buffer *buffer = to_isp_buffer(buf);
	struct isp_video *video = vfh->video;
	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
	enum isp_pipeline_state state;
	unsigned long flags;
	unsigned int empty;
	unsigned int start;

	empty = list_empty(&video->dmaqueue);
	list_add_tail(&buffer->buffer.irqlist, &video->dmaqueue);

	if (empty) {
		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
			state = ISP_PIPELINE_QUEUE_OUTPUT;
		else
			state = ISP_PIPELINE_QUEUE_INPUT;

		spin_lock_irqsave(&pipe->lock, flags);
		pipe->state |= state;
		video->ops->queue(video, buffer);
		video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;

		start = isp_pipeline_ready(pipe);
		if (start)
			pipe->state |= ISP_PIPELINE_STREAM;
		spin_unlock_irqrestore(&pipe->lock, flags);

		if (start)
			omap3isp_pipeline_set_stream(pipe,
						ISP_PIPELINE_STREAM_SINGLESHOT);
	}
}

static const struct isp_video_queue_operations isp_video_queue_ops = {
	.queue_prepare = &isp_video_queue_prepare,
	.buffer_prepare = &isp_video_buffer_prepare,
	.buffer_queue = &isp_video_buffer_queue,
	.buffer_cleanup = &isp_video_buffer_cleanup,
};

/*
 * omap3isp_video_buffer_next - Complete the current buffer and return the next
 * @video: ISP video object
 * @error: Whether an error occurred during capture
 *
 * Remove the current video buffer from the DMA queue and fill its timestamp,
 * field count and state fields before waking up its completion handler.
 *
 * The buffer state is set to VIDEOBUF_DONE if no error occurred (@error is 0)
 * or VIDEOBUF_ERROR otherwise (@error is non-zero).
 *
 * The DMA queue is expected to contain at least one buffer.
 *
 * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 * empty.
 */
struct isp_buffer *omap3isp_video_buffer_next(struct isp_video *video,
					      unsigned int error)
{
	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
	struct isp_video_queue *queue = video->queue;
	enum isp_pipeline_state state;
	struct isp_video_buffer *buf;
	unsigned long flags;
	struct timespec ts;

	spin_lock_irqsave(&queue->irqlock, flags);
	if (WARN_ON(list_empty(&video->dmaqueue))) {
		spin_unlock_irqrestore(&queue->irqlock, flags);
		return NULL;
	}

	buf = list_first_entry(&video->dmaqueue, struct isp_video_buffer,
			       irqlist);
	list_del(&buf->irqlist);
	spin_unlock_irqrestore(&queue->irqlock, flags);

	ktime_get_ts(&ts);
	buf->vbuf.timestamp.tv_sec = ts.tv_sec;
	buf->vbuf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;

	/* Do frame number propagation only if this is the output video node.
	 * Frame number either comes from the CSI receivers or it gets
	 * incremented here if H3A is not active.
	 * Note: There is no guarantee that the output buffer will finish
	 * first, so the input number might lag behind by 1 in some cases.
	 */
	if (video == pipe->output && !pipe->do_propagation)
		buf->vbuf.sequence = atomic_inc_return(&pipe->frame_number);
	else
		buf->vbuf.sequence = atomic_read(&pipe->frame_number);

	buf->state = error ? ISP_BUF_STATE_ERROR : ISP_BUF_STATE_DONE;

	wake_up(&buf->wait);

	if (list_empty(&video->dmaqueue)) {
		if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
			state = ISP_PIPELINE_QUEUE_OUTPUT
			      | ISP_PIPELINE_STREAM;
		else
			state = ISP_PIPELINE_QUEUE_INPUT
			      | ISP_PIPELINE_STREAM;

		spin_lock_irqsave(&pipe->lock, flags);
		pipe->state &= ~state;
		if (video->pipe.stream_state == ISP_PIPELINE_STREAM_CONTINUOUS)
			video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
		spin_unlock_irqrestore(&pipe->lock, flags);
		return NULL;
	}

	if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
		spin_lock_irqsave(&pipe->lock, flags);
		pipe->state &= ~ISP_PIPELINE_STREAM;
		spin_unlock_irqrestore(&pipe->lock, flags);
	}

	buf = list_first_entry(&video->dmaqueue, struct isp_video_buffer,
			       irqlist);
	buf->state = ISP_BUF_STATE_ACTIVE;
	return to_isp_buffer(buf);
}

/*
 * omap3isp_video_resume - Perform resume operation on the buffers
 * @video: ISP video object
 * @continuous: Pipeline is in single shot mode if 0 or continuous mode otherwise
 *
 * This function is intended to be used on suspend/resume scenario. It
 * requests video queue layer to discard buffers marked as DONE if it's in
 * continuous mode and requests ISP modules to queue again the ACTIVE buffer
 * if there's any.
 */
void omap3isp_video_resume(struct isp_video *video, int continuous)
{
	struct isp_buffer *buf = NULL;

	if (continuous && video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		omap3isp_video_queue_discard_done(video->queue);

	if (!list_empty(&video->dmaqueue)) {
		buf = list_first_entry(&video->dmaqueue,
				       struct isp_buffer, buffer.irqlist);
		video->ops->queue(video, buf);
		video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_QUEUED;
	} else {
		if (continuous)
			video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
	}
}

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

static int
isp_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
{
	struct isp_video *video = video_drvdata(file);

	strlcpy(cap->driver, ISP_VIDEO_DRIVER_NAME, sizeof(cap->driver));
	strlcpy(cap->card, video->video.name, sizeof(cap->card));
	strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));

	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
	else
		cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;

	return 0;
}

static int
isp_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);

	if (format->type != video->type)
		return -EINVAL;

	mutex_lock(&video->mutex);
	*format = vfh->format;
	mutex_unlock(&video->mutex);

	return 0;
}

static int
isp_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);
	struct v4l2_mbus_framefmt fmt;

	if (format->type != video->type)
		return -EINVAL;

	mutex_lock(&video->mutex);

	/* Fill the bytesperline and sizeimage fields by converting to media bus
	 * format and back to pixel format.
	 */
	isp_video_pix_to_mbus(&format->fmt.pix, &fmt);
	isp_video_mbus_to_pix(video, &fmt, &format->fmt.pix);

	vfh->format = *format;

	mutex_unlock(&video->mutex);
	return 0;
}

static int
isp_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_subdev_format fmt;
	struct v4l2_subdev *subdev;
	u32 pad;
	int ret;

	if (format->type != video->type)
		return -EINVAL;

	subdev = isp_video_remote_subdev(video, &pad);
	if (subdev == NULL)
		return -EINVAL;

	isp_video_pix_to_mbus(&format->fmt.pix, &fmt.format);

	fmt.pad = pad;
	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
	if (ret)
		return ret == -ENOIOCTLCMD ? -EINVAL : ret;

	isp_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
	return 0;
}

static int
isp_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_subdev *subdev;
	int ret;

	subdev = isp_video_remote_subdev(video, NULL);
	if (subdev == NULL)
		return -EINVAL;

	mutex_lock(&video->mutex);
	ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
	mutex_unlock(&video->mutex);

	return ret == -ENOIOCTLCMD ? -EINVAL : ret;
}

static int
isp_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_subdev_format format;
	struct v4l2_subdev *subdev;
	u32 pad;
	int ret;

	subdev = isp_video_remote_subdev(video, &pad);
	if (subdev == NULL)
		return -EINVAL;

	/* Try the get crop operation first and fallback to get format if not
	 * implemented.
	 */
	ret = v4l2_subdev_call(subdev, video, g_crop, crop);
	if (ret != -ENOIOCTLCMD)
		return ret;

	format.pad = pad;
	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
	if (ret < 0)
		return ret == -ENOIOCTLCMD ? -EINVAL : ret;

	crop->c.left = 0;
	crop->c.top = 0;
	crop->c.width = format.format.width;
	crop->c.height = format.format.height;

	return 0;
}

static int
isp_video_set_crop(struct file *file, void *fh, struct v4l2_crop *crop)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_subdev *subdev;
	int ret;

	subdev = isp_video_remote_subdev(video, NULL);
	if (subdev == NULL)
		return -EINVAL;

	mutex_lock(&video->mutex);
	ret = v4l2_subdev_call(subdev, video, s_crop, crop);
	mutex_unlock(&video->mutex);

	return ret == -ENOIOCTLCMD ? -EINVAL : ret;
}

static int
isp_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);

	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
	    video->type != a->type)
		return -EINVAL;

	memset(a, 0, sizeof(*a));
	a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
	a->parm.output.timeperframe = vfh->timeperframe;

	return 0;
}

static int
isp_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);

	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
	    video->type != a->type)
		return -EINVAL;

	if (a->parm.output.timeperframe.denominator == 0)
		a->parm.output.timeperframe.denominator = 1;

	vfh->timeperframe = a->parm.output.timeperframe;

	return 0;
}

static int
isp_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);

	return omap3isp_video_queue_reqbufs(&vfh->queue, rb);
}

static int
isp_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);

	return omap3isp_video_queue_querybuf(&vfh->queue, b);
}

static int
isp_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);

	return omap3isp_video_queue_qbuf(&vfh->queue, b);
}

static int
isp_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);

	return omap3isp_video_queue_dqbuf(&vfh->queue, b,
					  file->f_flags & O_NONBLOCK);
}

/*
 * Stream management
 *
 * Every ISP pipeline has a single input and a single output. The input can be
 * either a sensor or a video node. The output is always a video node.
 *
 * As every pipeline has an output video node, the ISP video objects at the
 * pipeline output stores the pipeline state. It tracks the streaming state of
 * both the input and output, as well as the availability of buffers.
 *
 * In sensor-to-memory mode, frames are always available at the pipeline input.
 * Starting the sensor usually requires I2C transfers and must be done in
 * interruptible context. The pipeline is started and stopped synchronously
 * to the stream on/off commands. All modules in the pipeline will get their
 * subdev set stream handler called. The module at the end of the pipeline must
 * delay starting the hardware until buffers are available at its output.
 *
 * In memory-to-memory mode, starting/stopping the stream requires
 * synchronization between the input and output. ISP modules can't be stopped
 * in the middle of a frame, and at least some of the modules seem to become
 * busy as soon as they're started, even if they don't receive a frame start
 * event. For that reason frames need to be processed in single-shot mode. The
 * driver needs to wait until a frame is completely processed and written to
 * memory before restarting the pipeline for the next frame. Pipelined
 * processing might be possible but requires more testing.
 *
 * Stream start must be delayed until buffers are available at both the input
 * and output. The pipeline must be started in the videobuf queue callback with
 * the buffers queue spinlock held. The modules subdev set stream operation must
 * not sleep.
 */
static int
isp_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);
	enum isp_pipeline_state state;
	struct isp_pipeline *pipe;
	struct isp_video *far_end;
	unsigned long flags;
	int ret;

	if (type != video->type)
		return -EINVAL;

	mutex_lock(&video->stream_lock);

	if (video->streaming) {
		mutex_unlock(&video->stream_lock);
		return -EBUSY;
	}

	/* Start streaming on the pipeline. No link touching an entity in the
	 * pipeline can be activated or deactivated once streaming is started.
	 */
	pipe = video->video.entity.pipe
	     ? to_isp_pipeline(&video->video.entity) : &video->pipe;
	media_entity_pipeline_start(&video->video.entity, &pipe->pipe);

	/* Verify that the currently configured format matches the output of
	 * the connected subdev.
	 */
	ret = isp_video_check_format(video, vfh);
	if (ret < 0)
		goto error;

	video->bpl_padding = ret;
	video->bpl_value = vfh->format.fmt.pix.bytesperline;

	/* Find the ISP video node connected at the far end of the pipeline and
	 * update the pipeline.
	 */
	far_end = isp_video_far_end(video);

	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
		state = ISP_PIPELINE_STREAM_OUTPUT | ISP_PIPELINE_IDLE_OUTPUT;
		pipe->input = far_end;
		pipe->output = video;
	} else {
		if (far_end == NULL) {
			ret = -EPIPE;
			goto error;
		}

		state = ISP_PIPELINE_STREAM_INPUT | ISP_PIPELINE_IDLE_INPUT;
		pipe->input = video;
		pipe->output = far_end;
	}

	if (video->isp->pdata->set_constraints)
		video->isp->pdata->set_constraints(video->isp, true);
	pipe->l3_ick = clk_get_rate(video->isp->clock[ISP_CLK_L3_ICK]);

	/* Validate the pipeline and update its state. */
	ret = isp_video_validate_pipeline(pipe);
	if (ret < 0)
		goto error;

	spin_lock_irqsave(&pipe->lock, flags);
	pipe->state &= ~ISP_PIPELINE_STREAM;
	pipe->state |= state;
	spin_unlock_irqrestore(&pipe->lock, flags);

	/* Set the maximum time per frame as the value requested by userspace.
	 * This is a soft limit that can be overridden if the hardware doesn't
	 * support the request limit.
	 */
	if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
		pipe->max_timeperframe = vfh->timeperframe;

	video->queue = &vfh->queue;
	INIT_LIST_HEAD(&video->dmaqueue);
	atomic_set(&pipe->frame_number, -1);

	ret = omap3isp_video_queue_streamon(&vfh->queue);
	if (ret < 0)
		goto error;

	/* In sensor-to-memory mode, the stream can be started synchronously
	 * to the stream on command. In memory-to-memory mode, it will be
	 * started when buffers are queued on both the input and output.
	 */
	if (pipe->input == NULL) {
		ret = omap3isp_pipeline_set_stream(pipe,
					      ISP_PIPELINE_STREAM_CONTINUOUS);
		if (ret < 0)
			goto error;
		spin_lock_irqsave(&video->queue->irqlock, flags);
		if (list_empty(&video->dmaqueue))
			video->dmaqueue_flags |= ISP_VIDEO_DMAQUEUE_UNDERRUN;
		spin_unlock_irqrestore(&video->queue->irqlock, flags);
	}

error:
	if (ret < 0) {
		omap3isp_video_queue_streamoff(&vfh->queue);
		if (video->isp->pdata->set_constraints)
			video->isp->pdata->set_constraints(video->isp, false);
		media_entity_pipeline_stop(&video->video.entity);
		/* The DMA queue must be emptied here, otherwise CCDC interrupts
		 * that will get triggered the next time the CCDC is powered up
		 * will try to access buffers that might have been freed but
		 * still present in the DMA queue. This can easily get triggered
		 * if the above omap3isp_pipeline_set_stream() call fails on a
		 * system with a free-running sensor.
		 */
		INIT_LIST_HEAD(&video->dmaqueue);
		video->queue = NULL;
	}

	if (!ret)
		video->streaming = 1;

	mutex_unlock(&video->stream_lock);
	return ret;
}

static int
isp_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
{
	struct isp_video_fh *vfh = to_isp_video_fh(fh);
	struct isp_video *video = video_drvdata(file);
	struct isp_pipeline *pipe = to_isp_pipeline(&video->video.entity);
	enum isp_pipeline_state state;
	unsigned int streaming;
	unsigned long flags;

	if (type != video->type)
		return -EINVAL;

	mutex_lock(&video->stream_lock);

	/* Make sure we're not streaming yet. */
	mutex_lock(&vfh->queue.lock);
	streaming = vfh->queue.streaming;
	mutex_unlock(&vfh->queue.lock);

	if (!streaming)
		goto done;

	/* Update the pipeline state. */
	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
		state = ISP_PIPELINE_STREAM_OUTPUT
		      | ISP_PIPELINE_QUEUE_OUTPUT;
	else
		state = ISP_PIPELINE_STREAM_INPUT
		      | ISP_PIPELINE_QUEUE_INPUT;

	spin_lock_irqsave(&pipe->lock, flags);
	pipe->state &= ~state;
	spin_unlock_irqrestore(&pipe->lock, flags);

	/* Stop the stream. */
	omap3isp_pipeline_set_stream(pipe, ISP_PIPELINE_STREAM_STOPPED);
	omap3isp_video_queue_streamoff(&vfh->queue);
	video->queue = NULL;
	video->streaming = 0;

	if (video->isp->pdata->set_constraints)
		video->isp->pdata->set_constraints(video->isp, false);
	media_entity_pipeline_stop(&video->video.entity);

done:
	mutex_unlock(&video->stream_lock);
	return 0;
}

static int
isp_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
{
	if (input->index > 0)
		return -EINVAL;

	strlcpy(input->name, "camera", sizeof(input->name));
	input->type = V4L2_INPUT_TYPE_CAMERA;

	return 0;
}

static int
isp_video_g_input(struct file *file, void *fh, unsigned int *input)
{
	*input = 0;

	return 0;
}

static int
isp_video_s_input(struct file *file, void *fh, unsigned int input)
{
	return input == 0 ? 0 : -EINVAL;
}

static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
	.vidioc_querycap		= isp_video_querycap,
	.vidioc_g_fmt_vid_cap		= isp_video_get_format,
	.vidioc_s_fmt_vid_cap		= isp_video_set_format,
	.vidioc_try_fmt_vid_cap		= isp_video_try_format,
	.vidioc_g_fmt_vid_out		= isp_video_get_format,
	.vidioc_s_fmt_vid_out		= isp_video_set_format,
	.vidioc_try_fmt_vid_out		= isp_video_try_format,
	.vidioc_cropcap			= isp_video_cropcap,
	.vidioc_g_crop			= isp_video_get_crop,
	.vidioc_s_crop			= isp_video_set_crop,
	.vidioc_g_parm			= isp_video_get_param,
	.vidioc_s_parm			= isp_video_set_param,
	.vidioc_reqbufs			= isp_video_reqbufs,
	.vidioc_querybuf		= isp_video_querybuf,
	.vidioc_qbuf			= isp_video_qbuf,
	.vidioc_dqbuf			= isp_video_dqbuf,
	.vidioc_streamon		= isp_video_streamon,
	.vidioc_streamoff		= isp_video_streamoff,
	.vidioc_enum_input		= isp_video_enum_input,
	.vidioc_g_input			= isp_video_g_input,
	.vidioc_s_input			= isp_video_s_input,
};

/* -----------------------------------------------------------------------------
 * V4L2 file operations
 */

static int isp_video_open(struct file *file)
{
	struct isp_video *video = video_drvdata(file);
	struct isp_video_fh *handle;
	int ret = 0;

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

	v4l2_fh_init(&handle->vfh, &video->video);
	v4l2_fh_add(&handle->vfh);

	/* If this is the first user, initialise the pipeline. */
	if (omap3isp_get(video->isp) == NULL) {
		ret = -EBUSY;
		goto done;
	}

	ret = omap3isp_pipeline_pm_use(&video->video.entity, 1);
	if (ret < 0) {
		omap3isp_put(video->isp);
		goto done;
	}

	omap3isp_video_queue_init(&handle->queue, video->type,
				  &isp_video_queue_ops, video->isp->dev,
				  sizeof(struct isp_buffer));

	memset(&handle->format, 0, sizeof(handle->format));
	handle->format.type = video->type;
	handle->timeperframe.denominator = 1;

	handle->video = video;
	file->private_data = &handle->vfh;

done:
	if (ret < 0) {
		v4l2_fh_del(&handle->vfh);
		kfree(handle);
	}

	return ret;
}

static int isp_video_release(struct file *file)
{
	struct isp_video *video = video_drvdata(file);
	struct v4l2_fh *vfh = file->private_data;
	struct isp_video_fh *handle = to_isp_video_fh(vfh);

	/* Disable streaming and free the buffers queue resources. */
	isp_video_streamoff(file, vfh, video->type);

	mutex_lock(&handle->queue.lock);
	omap3isp_video_queue_cleanup(&handle->queue);
	mutex_unlock(&handle->queue.lock);

	omap3isp_pipeline_pm_use(&video->video.entity, 0);

	/* Release the file handle. */
	v4l2_fh_del(vfh);
	kfree(handle);
	file->private_data = NULL;

	omap3isp_put(video->isp);

	return 0;
}

static unsigned int isp_video_poll(struct file *file, poll_table *wait)
{
	struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);
	struct isp_video_queue *queue = &vfh->queue;

	return omap3isp_video_queue_poll(queue, file, wait);
}

static int isp_video_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct isp_video_fh *vfh = to_isp_video_fh(file->private_data);

	return omap3isp_video_queue_mmap(&vfh->queue, vma);
}

static struct v4l2_file_operations isp_video_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = video_ioctl2,
	.open = isp_video_open,
	.release = isp_video_release,
	.poll = isp_video_poll,
	.mmap = isp_video_mmap,
};

/* -----------------------------------------------------------------------------
 * ISP video core
 */

static const struct isp_video_operations isp_video_dummy_ops = {
};

int omap3isp_video_init(struct isp_video *video, const char *name)
{
	const char *direction;
	int ret;

	switch (video->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		direction = "output";
		video->pad.flags = MEDIA_PAD_FL_SINK;
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		direction = "input";
		video->pad.flags = MEDIA_PAD_FL_SOURCE;
		break;

	default:
		return -EINVAL;
	}

	ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
	if (ret < 0)
		return ret;

	mutex_init(&video->mutex);
	atomic_set(&video->active, 0);

	spin_lock_init(&video->pipe.lock);
	mutex_init(&video->stream_lock);

	/* Initialize the video device. */
	if (video->ops == NULL)
		video->ops = &isp_video_dummy_ops;

	video->video.fops = &isp_video_fops;
	snprintf(video->video.name, sizeof(video->video.name),
		 "OMAP3 ISP %s %s", name, direction);
	video->video.vfl_type = VFL_TYPE_GRABBER;
	video->video.release = video_device_release_empty;
	video->video.ioctl_ops = &isp_video_ioctl_ops;
	video->pipe.stream_state = ISP_PIPELINE_STREAM_STOPPED;

	video_set_drvdata(&video->video, video);

	return 0;
}

int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)
{
	int ret;

	video->video.v4l2_dev = vdev;

	ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
	if (ret < 0)
		printk(KERN_ERR "%s: could not register video device (%d)\n",
			__func__, ret);

	return ret;
}

void omap3isp_video_unregister(struct isp_video *video)
{
	if (video_is_registered(&video->video)) {
		media_entity_cleanup(&video->video.entity);
		video_unregister_device(&video->video);
	}
}