summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/davinci/vpbe_display.c
blob: bf5eff99452b82b581098e337e0adf6b1f47f0b4 (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
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
/*
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.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 version 2.
 *
 * This program is distributed WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <linux/slab.h>

#include <asm/pgtable.h>
#include <mach/cputype.h>

#include <media/v4l2-dev.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <media/davinci/vpbe_display.h>
#include <media/davinci/vpbe_types.h>
#include <media/davinci/vpbe.h>
#include <media/davinci/vpbe_venc.h>
#include <media/davinci/vpbe_osd.h>
#include "vpbe_venc_regs.h"

#define VPBE_DISPLAY_DRIVER "vpbe-v4l2"

static int debug;

#define VPBE_DEFAULT_NUM_BUFS 3

module_param(debug, int, 0644);

static int vpbe_set_osd_display_params(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer);

static int venc_is_second_field(struct vpbe_display *disp_dev)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int ret;
	int val;

	ret = v4l2_subdev_call(vpbe_dev->venc,
			       core,
			       ioctl,
			       VENC_GET_FLD,
			       &val);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			 "Error in getting Field ID 0\n");
	}
	return val;
}

static void vpbe_isr_even_field(struct vpbe_display *disp_obj,
				struct vpbe_layer *layer)
{
	struct timespec timevalue;

	if (layer->cur_frm == layer->next_frm)
		return;
	ktime_get_ts(&timevalue);
	layer->cur_frm->vb.v4l2_buf.timestamp.tv_sec =
		timevalue.tv_sec;
	layer->cur_frm->vb.v4l2_buf.timestamp.tv_usec =
		timevalue.tv_nsec / NSEC_PER_USEC;
	vb2_buffer_done(&layer->cur_frm->vb, VB2_BUF_STATE_DONE);
	/* Make cur_frm pointing to next_frm */
	layer->cur_frm = layer->next_frm;
}

static void vpbe_isr_odd_field(struct vpbe_display *disp_obj,
				struct vpbe_layer *layer)
{
	struct osd_state *osd_device = disp_obj->osd_device;
	unsigned long addr;

	spin_lock(&disp_obj->dma_queue_lock);
	if (list_empty(&layer->dma_queue) ||
		(layer->cur_frm != layer->next_frm)) {
		spin_unlock(&disp_obj->dma_queue_lock);
		return;
	}
	/*
	 * one field is displayed configure
	 * the next frame if it is available
	 * otherwise hold on current frame
	 * Get next from the buffer queue
	 */
	layer->next_frm = list_entry(layer->dma_queue.next,
			  struct  vpbe_disp_buffer, list);
	/* Remove that from the buffer queue */
	list_del(&layer->next_frm->list);
	spin_unlock(&disp_obj->dma_queue_lock);
	/* Mark state of the frame to active */
	layer->next_frm->vb.state = VB2_BUF_STATE_ACTIVE;
	addr = vb2_dma_contig_plane_dma_addr(&layer->next_frm->vb, 0);
	osd_device->ops.start_layer(osd_device,
			layer->layer_info.id,
			addr,
			disp_obj->cbcr_ofst);
}

/* interrupt service routine */
static irqreturn_t venc_isr(int irq, void *arg)
{
	struct vpbe_display *disp_dev = (struct vpbe_display *)arg;
	struct vpbe_layer *layer;
	static unsigned last_event;
	unsigned event = 0;
	int fid;
	int i;

	if ((NULL == arg) || (NULL == disp_dev->dev[0]))
		return IRQ_HANDLED;

	if (venc_is_second_field(disp_dev))
		event |= VENC_SECOND_FIELD;
	else
		event |= VENC_FIRST_FIELD;

	if (event == (last_event & ~VENC_END_OF_FRAME)) {
		/*
		* If the display is non-interlaced, then we need to flag the
		* end-of-frame event at every interrupt regardless of the
		* value of the FIDST bit.  We can conclude that the display is
		* non-interlaced if the value of the FIDST bit is unchanged
		* from the previous interrupt.
		*/
		event |= VENC_END_OF_FRAME;
	} else if (event == VENC_SECOND_FIELD) {
		/* end-of-frame for interlaced display */
		event |= VENC_END_OF_FRAME;
	}
	last_event = event;

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		layer = disp_dev->dev[i];
		/* If streaming is started in this layer */
		if (!layer->started)
			continue;

		if (layer->layer_first_int) {
			layer->layer_first_int = 0;
			continue;
		}
		/* Check the field format */
		if ((V4L2_FIELD_NONE == layer->pix_fmt.field) &&
			(event & VENC_END_OF_FRAME)) {
			/* Progressive mode */

			vpbe_isr_even_field(disp_dev, layer);
			vpbe_isr_odd_field(disp_dev, layer);
		} else {
		/* Interlaced mode */

			layer->field_id ^= 1;
			if (event & VENC_FIRST_FIELD)
				fid = 0;
			else
				fid = 1;

			/*
			* If field id does not match with store
			* field id
			*/
			if (fid != layer->field_id) {
				/* Make them in sync */
				layer->field_id = fid;
				continue;
			}
			/*
			* device field id and local field id are
			* in sync. If this is even field
			*/
			if (0 == fid)
				vpbe_isr_even_field(disp_dev, layer);
			else  /* odd field */
				vpbe_isr_odd_field(disp_dev, layer);
		}
	}

	return IRQ_HANDLED;
}

/*
 * vpbe_buffer_prepare()
 * This is the callback function called from vb2_qbuf() function
 * the buffer is prepared and user space virtual address is converted into
 * physical address
 */
static int vpbe_buffer_prepare(struct vb2_buffer *vb)
{
	struct vpbe_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
	struct vb2_queue *q = vb->vb2_queue;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned long addr;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
				"vpbe_buffer_prepare\n");

	if (vb->state != VB2_BUF_STATE_ACTIVE &&
		vb->state != VB2_BUF_STATE_PREPARED) {
		vb2_set_plane_payload(vb, 0, layer->pix_fmt.sizeimage);
		if (vb2_plane_vaddr(vb, 0) &&
		vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
			return -EINVAL;

		addr = vb2_dma_contig_plane_dma_addr(vb, 0);
		if (q->streaming) {
			if (!IS_ALIGNED(addr, 8)) {
				v4l2_err(&vpbe_dev->v4l2_dev,
					"buffer_prepare:offset is \
					not aligned to 32 bytes\n");
				return -EINVAL;
			}
		}
	}
	return 0;
}

/*
 * vpbe_buffer_setup()
 * This function allocates memory for the buffers
 */
static int
vpbe_buffer_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
			unsigned int *nbuffers, unsigned int *nplanes,
			unsigned int sizes[], void *alloc_ctxs[])

{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_buffer_setup\n");

	/* Store number of buffers allocated in numbuffer member */
	if (*nbuffers < VPBE_DEFAULT_NUM_BUFS)
		*nbuffers = layer->numbuffers = VPBE_DEFAULT_NUM_BUFS;

	*nplanes = 1;
	sizes[0] = layer->pix_fmt.sizeimage;
	alloc_ctxs[0] = layer->alloc_ctx;

	return 0;
}

/*
 * vpbe_buffer_queue()
 * This function adds the buffer to DMA queue
 */
static void vpbe_buffer_queue(struct vb2_buffer *vb)
{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
	struct vpbe_disp_buffer *buf = container_of(vb,
				struct vpbe_disp_buffer, vb);
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned long flags;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe_buffer_queue\n");

	/* add the buffer to the DMA queue */
	spin_lock_irqsave(&disp->dma_queue_lock, flags);
	list_add_tail(&buf->list, &layer->dma_queue);
	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
}

/*
 * vpbe_buf_cleanup()
 * This function is called from the vb2 layer to free memory allocated to
 * the buffers
 */
static void vpbe_buf_cleanup(struct vb2_buffer *vb)
{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct vpbe_disp_buffer *buf = container_of(vb,
					struct vpbe_disp_buffer, vb);
	unsigned long flags;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe_buf_cleanup\n");

	spin_lock_irqsave(&layer->irqlock, flags);
	if (vb->state == VB2_BUF_STATE_ACTIVE)
		list_del_init(&buf->list);
	spin_unlock_irqrestore(&layer->irqlock, flags);
}

static void vpbe_wait_prepare(struct vb2_queue *vq)
{
	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
	struct vpbe_layer *layer = fh->layer;

	mutex_unlock(&layer->opslock);
}

static void vpbe_wait_finish(struct vb2_queue *vq)
{
	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
	struct vpbe_layer *layer = fh->layer;

	mutex_lock(&layer->opslock);
}

static int vpbe_buffer_init(struct vb2_buffer *vb)
{
	struct vpbe_disp_buffer *buf = container_of(vb,
					struct vpbe_disp_buffer, vb);

	INIT_LIST_HEAD(&buf->list);
	return 0;
}

static int vpbe_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
	struct vpbe_layer *layer = fh->layer;
	int ret;

	/* Get the next frame from the buffer queue */
	layer->next_frm = layer->cur_frm = list_entry(layer->dma_queue.next,
				struct vpbe_disp_buffer, list);
	/* Remove buffer from the buffer queue */
	list_del(&layer->cur_frm->list);
	/* Mark state of the current frame to active */
	layer->cur_frm->vb.state = VB2_BUF_STATE_ACTIVE;
	/* Initialize field_id and started member */
	layer->field_id = 0;

	/* Set parameters in OSD and VENC */
	ret = vpbe_set_osd_display_params(fh->disp_dev, layer);
	if (ret < 0) {
		struct vpbe_disp_buffer *buf, *tmp;

		vb2_buffer_done(&layer->cur_frm->vb, VB2_BUF_STATE_QUEUED);
		list_for_each_entry_safe(buf, tmp, &layer->dma_queue, list) {
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb, VB2_BUF_STATE_QUEUED);
		}

		return ret;
	}

	/*
	 * if request format is yuv420 semiplanar, need to
	 * enable both video windows
	 */
	layer->started = 1;
	layer->layer_first_int = 1;

	return ret;
}

static void vpbe_stop_streaming(struct vb2_queue *vq)
{
	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp = fh->disp_dev;
	unsigned long flags;

	if (!vb2_is_streaming(vq))
		return;

	/* release all active buffers */
	spin_lock_irqsave(&disp->dma_queue_lock, flags);
	if (layer->cur_frm == layer->next_frm) {
		vb2_buffer_done(&layer->cur_frm->vb, VB2_BUF_STATE_ERROR);
	} else {
		if (layer->cur_frm != NULL)
			vb2_buffer_done(&layer->cur_frm->vb,
					VB2_BUF_STATE_ERROR);
		if (layer->next_frm != NULL)
			vb2_buffer_done(&layer->next_frm->vb,
					VB2_BUF_STATE_ERROR);
	}

	while (!list_empty(&layer->dma_queue)) {
		layer->next_frm = list_entry(layer->dma_queue.next,
						struct vpbe_disp_buffer, list);
		list_del(&layer->next_frm->list);
		vb2_buffer_done(&layer->next_frm->vb, VB2_BUF_STATE_ERROR);
	}
	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
}

static struct vb2_ops video_qops = {
	.queue_setup = vpbe_buffer_queue_setup,
	.wait_prepare = vpbe_wait_prepare,
	.wait_finish = vpbe_wait_finish,
	.buf_init = vpbe_buffer_init,
	.buf_prepare = vpbe_buffer_prepare,
	.start_streaming = vpbe_start_streaming,
	.stop_streaming = vpbe_stop_streaming,
	.buf_cleanup = vpbe_buf_cleanup,
	.buf_queue = vpbe_buffer_queue,
};

static
struct vpbe_layer*
_vpbe_display_get_other_win_layer(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer)
{
	enum vpbe_display_device_id thiswin, otherwin;
	thiswin = layer->device_id;

	otherwin = (thiswin == VPBE_DISPLAY_DEVICE_0) ?
	VPBE_DISPLAY_DEVICE_1 : VPBE_DISPLAY_DEVICE_0;
	return disp_dev->dev[otherwin];
}

static int vpbe_set_osd_display_params(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer)
{
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct osd_state *osd_device = disp_dev->osd_device;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	unsigned long addr;
	int ret;

	addr = vb2_dma_contig_plane_dma_addr(&layer->cur_frm->vb, 0);
	/* Set address in the display registers */
	osd_device->ops.start_layer(osd_device,
				    layer->layer_info.id,
				    addr,
				    disp_dev->cbcr_ofst);

	ret = osd_device->ops.enable_layer(osd_device,
				layer->layer_info.id, 0);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Error in enabling osd window layer 0\n");
		return -1;
	}

	/* Enable the window */
	layer->layer_info.enable = 1;
	if (cfg->pixfmt == PIXFMT_NV12) {
		struct vpbe_layer *otherlayer =
			_vpbe_display_get_other_win_layer(disp_dev, layer);

		ret = osd_device->ops.enable_layer(osd_device,
				otherlayer->layer_info.id, 1);
		if (ret < 0) {
			v4l2_err(&vpbe_dev->v4l2_dev,
				"Error in enabling osd window layer 1\n");
			return -1;
		}
		otherlayer->layer_info.enable = 1;
	}
	return 0;
}

static void
vpbe_disp_calculate_scale_factor(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer,
			int expected_xsize, int expected_ysize)
{
	struct display_layer_info *layer_info = &layer->layer_info;
	struct v4l2_pix_format *pixfmt = &layer->pix_fmt;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int calculated_xsize;
	int h_exp = 0;
	int v_exp = 0;
	int h_scale;
	int v_scale;

	v4l2_std_id standard_id = vpbe_dev->current_timings.std_id;

	/*
	 * Application initially set the image format. Current display
	 * size is obtained from the vpbe display controller. expected_xsize
	 * and expected_ysize are set through S_CROP ioctl. Based on this,
	 * driver will calculate the scale factors for vertical and
	 * horizontal direction so that the image is displayed scaled
	 * and expanded. Application uses expansion to display the image
	 * in a square pixel. Otherwise it is displayed using displays
	 * pixel aspect ratio.It is expected that application chooses
	 * the crop coordinates for cropped or scaled display. if crop
	 * size is less than the image size, it is displayed cropped or
	 * it is displayed scaled and/or expanded.
	 *
	 * to begin with, set the crop window same as expected. Later we
	 * will override with scaled window size
	 */

	cfg->xsize = pixfmt->width;
	cfg->ysize = pixfmt->height;
	layer_info->h_zoom = ZOOM_X1;	/* no horizontal zoom */
	layer_info->v_zoom = ZOOM_X1;	/* no horizontal zoom */
	layer_info->h_exp = H_EXP_OFF;	/* no horizontal zoom */
	layer_info->v_exp = V_EXP_OFF;	/* no horizontal zoom */

	if (pixfmt->width < expected_xsize) {
		h_scale = vpbe_dev->current_timings.xres / pixfmt->width;
		if (h_scale < 2)
			h_scale = 1;
		else if (h_scale >= 4)
			h_scale = 4;
		else
			h_scale = 2;
		cfg->xsize *= h_scale;
		if (cfg->xsize < expected_xsize) {
			if ((standard_id & V4L2_STD_525_60) ||
			(standard_id & V4L2_STD_625_50)) {
				calculated_xsize = (cfg->xsize *
					VPBE_DISPLAY_H_EXP_RATIO_N) /
					VPBE_DISPLAY_H_EXP_RATIO_D;
				if (calculated_xsize <= expected_xsize) {
					h_exp = 1;
					cfg->xsize = calculated_xsize;
				}
			}
		}
		if (h_scale == 2)
			layer_info->h_zoom = ZOOM_X2;
		else if (h_scale == 4)
			layer_info->h_zoom = ZOOM_X4;
		if (h_exp)
			layer_info->h_exp = H_EXP_9_OVER_8;
	} else {
		/* no scaling, only cropping. Set display area to crop area */
		cfg->xsize = expected_xsize;
	}

	if (pixfmt->height < expected_ysize) {
		v_scale = expected_ysize / pixfmt->height;
		if (v_scale < 2)
			v_scale = 1;
		else if (v_scale >= 4)
			v_scale = 4;
		else
			v_scale = 2;
		cfg->ysize *= v_scale;
		if (cfg->ysize < expected_ysize) {
			if ((standard_id & V4L2_STD_625_50)) {
				calculated_xsize = (cfg->ysize *
					VPBE_DISPLAY_V_EXP_RATIO_N) /
					VPBE_DISPLAY_V_EXP_RATIO_D;
				if (calculated_xsize <= expected_ysize) {
					v_exp = 1;
					cfg->ysize = calculated_xsize;
				}
			}
		}
		if (v_scale == 2)
			layer_info->v_zoom = ZOOM_X2;
		else if (v_scale == 4)
			layer_info->v_zoom = ZOOM_X4;
		if (v_exp)
			layer_info->h_exp = V_EXP_6_OVER_5;
	} else {
		/* no scaling, only cropping. Set display area to crop area */
		cfg->ysize = expected_ysize;
	}
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"crop display xsize = %d, ysize = %d\n",
		cfg->xsize, cfg->ysize);
}

static void vpbe_disp_adj_position(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer,
			int top, int left)
{
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;

	cfg->xpos = min((unsigned int)left,
			vpbe_dev->current_timings.xres - cfg->xsize);
	cfg->ypos = min((unsigned int)top,
			vpbe_dev->current_timings.yres - cfg->ysize);

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"new xpos = %d, ypos = %d\n",
		cfg->xpos, cfg->ypos);
}

static void vpbe_disp_check_window_params(struct vpbe_display *disp_dev,
			struct v4l2_rect *c)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;

	if ((c->width == 0) ||
	  ((c->width + c->left) > vpbe_dev->current_timings.xres))
		c->width = vpbe_dev->current_timings.xres - c->left;

	if ((c->height == 0) || ((c->height + c->top) >
	  vpbe_dev->current_timings.yres))
		c->height = vpbe_dev->current_timings.yres - c->top;

	/* window height must be even for interlaced display */
	if (vpbe_dev->current_timings.interlaced)
		c->height &= (~0x01);

}

/**
 * vpbe_try_format()
 * If user application provides width and height, and have bytesperline set
 * to zero, driver calculates bytesperline and sizeimage based on hardware
 * limits.
 */
static int vpbe_try_format(struct vpbe_display *disp_dev,
			struct v4l2_pix_format *pixfmt, int check)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int min_height = 1;
	int min_width = 32;
	int max_height;
	int max_width;
	int bpp;

	if ((pixfmt->pixelformat != V4L2_PIX_FMT_UYVY) &&
	    (pixfmt->pixelformat != V4L2_PIX_FMT_NV12))
		/* choose default as V4L2_PIX_FMT_UYVY */
		pixfmt->pixelformat = V4L2_PIX_FMT_UYVY;

	/* Check the field format */
	if ((pixfmt->field != V4L2_FIELD_INTERLACED) &&
		(pixfmt->field != V4L2_FIELD_NONE)) {
		if (vpbe_dev->current_timings.interlaced)
			pixfmt->field = V4L2_FIELD_INTERLACED;
		else
			pixfmt->field = V4L2_FIELD_NONE;
	}

	if (pixfmt->field == V4L2_FIELD_INTERLACED)
		min_height = 2;

	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12)
		bpp = 1;
	else
		bpp = 2;

	max_width = vpbe_dev->current_timings.xres;
	max_height = vpbe_dev->current_timings.yres;

	min_width /= bpp;

	if (!pixfmt->width || (pixfmt->width < min_width) ||
		(pixfmt->width > max_width)) {
		pixfmt->width = vpbe_dev->current_timings.xres;
	}

	if (!pixfmt->height || (pixfmt->height  < min_height) ||
		(pixfmt->height  > max_height)) {
		pixfmt->height = vpbe_dev->current_timings.yres;
	}

	if (pixfmt->bytesperline < (pixfmt->width * bpp))
		pixfmt->bytesperline = pixfmt->width * bpp;

	/* Make the bytesperline 32 byte aligned */
	pixfmt->bytesperline = ((pixfmt->width * bpp + 31) & ~31);

	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12)
		pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height +
				(pixfmt->bytesperline * pixfmt->height >> 1);
	else
		pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;

	return 0;
}

static int vpbe_display_querycap(struct file *file, void  *priv,
			       struct v4l2_capability *cap)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	cap->version = VPBE_DISPLAY_VERSION_CODE;
	cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	snprintf(cap->driver, sizeof(cap->driver), "%s",
		dev_name(vpbe_dev->pdev));
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
		 dev_name(vpbe_dev->pdev));
	strlcpy(cap->card, vpbe_dev->cfg->module_name, sizeof(cap->card));

	return 0;
}

static int vpbe_display_s_crop(struct file *file, void *priv,
			     const struct v4l2_crop *crop)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct osd_state *osd_device = disp_dev->osd_device;
	struct v4l2_rect rect = crop->c;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_S_CROP, layer id = %d\n", layer->device_id);

	if (crop->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buf type\n");
		return -EINVAL;
	}

	if (rect.top < 0)
		rect.top = 0;
	if (rect.left < 0)
		rect.left = 0;

	vpbe_disp_check_window_params(disp_dev, &rect);

	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);

	vpbe_disp_calculate_scale_factor(disp_dev, layer,
					rect.width,
					rect.height);
	vpbe_disp_adj_position(disp_dev, layer, rect.top,
					rect.left);
	ret = osd_device->ops.set_layer_config(osd_device,
				layer->layer_info.id, cfg);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Error in set layer config:\n");
		return -EINVAL;
	}

	/* apply zooming and h or v expansion */
	osd_device->ops.set_zoom(osd_device,
			layer->layer_info.id,
			layer->layer_info.h_zoom,
			layer->layer_info.v_zoom);
	ret = osd_device->ops.set_vid_expansion(osd_device,
			layer->layer_info.h_exp,
			layer->layer_info.v_exp);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
		"Error in set vid expansion:\n");
		return -EINVAL;
	}

	if ((layer->layer_info.h_zoom != ZOOM_X1) ||
		(layer->layer_info.v_zoom != ZOOM_X1) ||
		(layer->layer_info.h_exp != H_EXP_OFF) ||
		(layer->layer_info.v_exp != V_EXP_OFF))
		/* Enable expansion filter */
		osd_device->ops.set_interpolation_filter(osd_device, 1);
	else
		osd_device->ops.set_interpolation_filter(osd_device, 0);

	return 0;
}

static int vpbe_display_g_crop(struct file *file, void *priv,
			     struct v4l2_crop *crop)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = fh->disp_dev->osd_device;
	struct v4l2_rect *rect = &crop->c;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_G_CROP, layer id = %d\n",
			layer->device_id);

	if (crop->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buf type\n");
		return -EINVAL;
	}
	osd_device->ops.get_layer_config(osd_device,
				layer->layer_info.id, cfg);
	rect->top = cfg->ypos;
	rect->left = cfg->xpos;
	rect->width = cfg->xsize;
	rect->height = cfg->ysize;

	return 0;
}

static int vpbe_display_cropcap(struct file *file, void *priv,
			      struct v4l2_cropcap *cropcap)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_CROPCAP ioctl\n");

	cropcap->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	cropcap->bounds.left = 0;
	cropcap->bounds.top = 0;
	cropcap->bounds.width = vpbe_dev->current_timings.xres;
	cropcap->bounds.height = vpbe_dev->current_timings.yres;
	cropcap->pixelaspect = vpbe_dev->current_timings.aspect;
	cropcap->defrect = cropcap->bounds;
	return 0;
}

static int vpbe_display_g_fmt(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_G_FMT, layer id = %d\n",
			layer->device_id);

	/* If buffer type is video output */
	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}
	/* Fill in the information about format */
	fmt->fmt.pix = layer->pix_fmt;

	return 0;
}

static int vpbe_display_enum_fmt(struct file *file, void  *priv,
				   struct v4l2_fmtdesc *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned int index = 0;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
				"VIDIOC_ENUM_FMT, layer id = %d\n",
				layer->device_id);
	if (fmt->index > 1) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid format index\n");
		return -EINVAL;
	}

	/* Fill in the information about format */
	index = fmt->index;
	memset(fmt, 0, sizeof(*fmt));
	fmt->index = index;
	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	if (index == 0) {
		strcpy(fmt->description, "YUV 4:2:2 - UYVY");
		fmt->pixelformat = V4L2_PIX_FMT_UYVY;
	} else {
		strcpy(fmt->description, "Y/CbCr 4:2:0");
		fmt->pixelformat = V4L2_PIX_FMT_NV12;
	}

	return 0;
}

static int vpbe_display_s_fmt(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
	struct osd_state *osd_device = disp_dev->osd_device;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_S_FMT, layer id = %d\n",
			layer->device_id);

	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}
	/* Check for valid pixel format */
	ret = vpbe_try_format(disp_dev, pixfmt, 1);
	if (ret)
		return ret;

	/* YUV420 is requested, check availability of the
	other video window */

	layer->pix_fmt = *pixfmt;
	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12) {
		struct vpbe_layer *otherlayer;

		otherlayer = _vpbe_display_get_other_win_layer(disp_dev, layer);
		/* if other layer is available, only
		 * claim it, do not configure it
		 */
		ret = osd_device->ops.request_layer(osd_device,
						    otherlayer->layer_info.id);
		if (ret < 0) {
			v4l2_err(&vpbe_dev->v4l2_dev,
				 "Display Manager failed to allocate layer\n");
			return -EBUSY;
		}
	}

	/* Get osd layer config */
	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);
	/* Store the pixel format in the layer object */
	cfg->xsize = pixfmt->width;
	cfg->ysize = pixfmt->height;
	cfg->line_length = pixfmt->bytesperline;
	cfg->ypos = 0;
	cfg->xpos = 0;
	cfg->interlaced = vpbe_dev->current_timings.interlaced;

	if (V4L2_PIX_FMT_UYVY == pixfmt->pixelformat)
		cfg->pixfmt = PIXFMT_YCBCRI;

	/* Change of the default pixel format for both video windows */
	if (V4L2_PIX_FMT_NV12 == pixfmt->pixelformat) {
		struct vpbe_layer *otherlayer;
		cfg->pixfmt = PIXFMT_NV12;
		otherlayer = _vpbe_display_get_other_win_layer(disp_dev,
								layer);
		otherlayer->layer_info.config.pixfmt = PIXFMT_NV12;
	}

	/* Set the layer config in the osd window */
	ret = osd_device->ops.set_layer_config(osd_device,
				layer->layer_info.id, cfg);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
				"Error in S_FMT params:\n");
		return -EINVAL;
	}

	/* Readback and fill the local copy of current pix format */
	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);

	return 0;
}

static int vpbe_display_try_fmt(struct file *file, void *priv,
				  struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_TRY_FMT\n");

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}

	/* Check for valid field format */
	return  vpbe_try_format(disp_dev, pixfmt, 0);

}

/**
 * vpbe_display_s_std - Set the given standard in the encoder
 *
 * Sets the standard if supported by the current encoder. Return the status.
 * 0 - success & -EINVAL on error
 */
static int vpbe_display_s_std(struct file *file, void *priv,
				v4l2_std_id std_id)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_STD\n");

	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (NULL != vpbe_dev->ops.s_std) {
		ret = vpbe_dev->ops.s_std(vpbe_dev, std_id);
		if (ret) {
			v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set standard for sub devices\n");
			return -EINVAL;
		}
	} else {
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_g_std - Get the standard in the current encoder
 *
 * Get the standard in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int vpbe_display_g_std(struct file *file, void *priv,
				v4l2_std_id *std_id)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_G_STD\n");

	/* Get the standard from the current encoder */
	if (vpbe_dev->current_timings.timings_type & VPBE_ENC_STD) {
		*std_id = vpbe_dev->current_timings.std_id;
		return 0;
	}

	return -EINVAL;
}

/**
 * vpbe_display_enum_output - enumerate outputs
 *
 * Enumerates the outputs available at the vpbe display
 * returns the status, -EINVAL if end of output list
 */
static int vpbe_display_enum_output(struct file *file, void *priv,
				    struct v4l2_output *output)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_ENUM_OUTPUT\n");

	/* Enumerate outputs */

	if (NULL == vpbe_dev->ops.enum_outputs)
		return -EINVAL;

	ret = vpbe_dev->ops.enum_outputs(vpbe_dev, output);
	if (ret) {
		v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"Failed to enumerate outputs\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_s_output - Set output to
 * the output specified by the index
 */
static int vpbe_display_s_output(struct file *file, void *priv,
				unsigned int i)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_S_OUTPUT\n");
	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (NULL == vpbe_dev->ops.set_output)
		return -EINVAL;

	ret = vpbe_dev->ops.set_output(vpbe_dev, i);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set output for sub devices\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_g_output - Get output from subdevice
 * for a given by the index
 */
static int vpbe_display_g_output(struct file *file, void *priv,
				unsigned int *i)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_G_OUTPUT\n");
	/* Get the standard from the current encoder */
	*i = vpbe_dev->current_out_index;

	return 0;
}

/**
 * vpbe_display_enum_dv_timings - Enumerate the dv timings
 *
 * enum the timings in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_enum_dv_timings(struct file *file, void *priv,
			struct v4l2_enum_dv_timings *timings)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_ENUM_DV_TIMINGS\n");

	/* Enumerate outputs */
	if (NULL == vpbe_dev->ops.enum_dv_timings)
		return -EINVAL;

	ret = vpbe_dev->ops.enum_dv_timings(vpbe_dev, timings);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to enumerate dv timings info\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_s_dv_timings - Set the dv timings
 *
 * Set the timings in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_s_dv_timings(struct file *file, void *priv,
				struct v4l2_dv_timings *timings)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_DV_TIMINGS\n");


	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}

	/* Set the given standard in the encoder */
	if (!vpbe_dev->ops.s_dv_timings)
		return -EINVAL;

	ret = vpbe_dev->ops.s_dv_timings(vpbe_dev, timings);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set the dv timings info\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_g_dv_timings - Set the dv timings
 *
 * Get the timings in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_g_dv_timings(struct file *file, void *priv,
				struct v4l2_dv_timings *dv_timings)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_G_DV_TIMINGS\n");

	/* Get the given standard in the encoder */

	if (vpbe_dev->current_timings.timings_type &
				VPBE_ENC_DV_TIMINGS) {
		*dv_timings = vpbe_dev->current_timings.dv_timings;
	} else {
		return -EINVAL;
	}

	return 0;
}

static int vpbe_display_streamoff(struct file *file, void *priv,
				enum v4l2_buf_type buf_type)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = fh->disp_dev->osd_device;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_STREAMOFF,layer id = %d\n",
			layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf_type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If io is allowed for this file handle, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}

	/* If streaming is not started, return error */
	if (!layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "streaming not started in layer"
			" id = %d\n", layer->device_id);
		return -EINVAL;
	}

	osd_device->ops.disable_layer(osd_device,
			layer->layer_info.id);
	layer->started = 0;
	ret = vb2_streamoff(&layer->buffer_queue, buf_type);

	return ret;
}

static int vpbe_display_streamon(struct file *file, void *priv,
			 enum v4l2_buf_type buf_type)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;
	int ret;

	osd_device->ops.disable_layer(osd_device,
			layer->layer_info.id);

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_STREAMON, layerid=%d\n",
						layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf_type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If file handle is not allowed IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}
	/* If Streaming is already started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "layer is already streaming\n");
		return -EBUSY;
	}

	/*
	 * Call vb2_streamon to start streaming
	 * in videobuf
	 */
	ret = vb2_streamon(&layer->buffer_queue, buf_type);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
		"error in vb2_streamon\n");
		return ret;
	}
	return ret;
}

static int vpbe_display_dqbuf(struct file *file, void *priv,
		      struct v4l2_buffer *buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_DQBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}
	/* If this file handle is not allowed to do IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}
	if (file->f_flags & O_NONBLOCK)
		/* Call videobuf_dqbuf for non blocking mode */
		ret = vb2_dqbuf(&layer->buffer_queue, buf, 1);
	else
		/* Call videobuf_dqbuf for blocking mode */
		ret = vb2_dqbuf(&layer->buffer_queue, buf, 0);

	return ret;
}

static int vpbe_display_qbuf(struct file *file, void *priv,
		     struct v4l2_buffer *p)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_QBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != p->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If this file handle is not allowed to do IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}

	return vb2_qbuf(&layer->buffer_queue, p);
}

static int vpbe_display_querybuf(struct file *file, void *priv,
			 struct v4l2_buffer *buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_QUERYBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}
	/* Call vb2_querybuf to get information */
	return vb2_querybuf(&layer->buffer_queue, buf);
}

static int vpbe_display_reqbufs(struct file *file, void *priv,
			struct v4l2_requestbuffers *req_buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct vb2_queue *q;
	int ret;
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_reqbufs\n");

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != req_buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If io users of the layer is not zero, return error */
	if (0 != layer->io_usrs) {
		v4l2_err(&vpbe_dev->v4l2_dev, "not IO user\n");
		return -EBUSY;
	}
	/* Initialize videobuf queue as per the buffer type */
	layer->alloc_ctx = vb2_dma_contig_init_ctx(vpbe_dev->pdev);
	if (IS_ERR(layer->alloc_ctx)) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Failed to get the context\n");
		return PTR_ERR(layer->alloc_ctx);
	}
	q = &layer->buffer_queue;
	memset(q, 0, sizeof(*q));
	q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	q->io_modes = VB2_MMAP | VB2_USERPTR;
	q->drv_priv = fh;
	q->ops = &video_qops;
	q->mem_ops = &vb2_dma_contig_memops;
	q->buf_struct_size = sizeof(struct vpbe_disp_buffer);
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	q->min_buffers_needed = 1;

	ret = vb2_queue_init(q);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev, "vb2_queue_init() failed\n");
		vb2_dma_contig_cleanup_ctx(layer->alloc_ctx);
		return ret;
	}
	/* Set io allowed member of file handle to TRUE */
	fh->io_allowed = 1;
	/* Increment io usrs member of layer object to 1 */
	layer->io_usrs = 1;
	/* Store type of memory requested in layer object */
	layer->memory = req_buf->memory;
	/* Initialize buffer queue */
	INIT_LIST_HEAD(&layer->dma_queue);
	/* Allocate buffers */
	return vb2_reqbufs(q, req_buf);
}

/*
 * vpbe_display_mmap()
 * It is used to map kernel space buffers into user spaces
 */
static int vpbe_display_mmap(struct file *filep, struct vm_area_struct *vma)
{
	/* Get the layer object and file handle object */
	struct vpbe_fh *fh = filep->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_mmap\n");

	if (mutex_lock_interruptible(&layer->opslock))
		return -ERESTARTSYS;
	ret = vb2_mmap(&layer->buffer_queue, vma);
	mutex_unlock(&layer->opslock);
	return ret;
}

/* vpbe_display_poll(): It is used for select/poll system call
 */
static unsigned int vpbe_display_poll(struct file *filep, poll_table *wait)
{
	struct vpbe_fh *fh = filep->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned int err = 0;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_poll\n");
	if (layer->started) {
		mutex_lock(&layer->opslock);
		err = vb2_poll(&layer->buffer_queue, filep, wait);
		mutex_unlock(&layer->opslock);
	}
	return err;
}

/*
 * vpbe_display_open()
 * It creates object of file handle structure and stores it in private_data
 * member of filepointer
 */
static int vpbe_display_open(struct file *file)
{
	struct vpbe_fh *fh = NULL;
	struct vpbe_layer *layer = video_drvdata(file);
	struct video_device *vdev = video_devdata(file);
	struct vpbe_display *disp_dev = layer->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;
	int err;

	/* Allocate memory for the file handle object */
	fh = kmalloc(sizeof(struct vpbe_fh), GFP_KERNEL);
	if (fh == NULL) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"unable to allocate memory for file handle object\n");
		return -ENOMEM;
	}
	v4l2_fh_init(&fh->fh, vdev);
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe display open plane = %d\n",
			layer->device_id);

	/* store pointer to fh in private_data member of filep */
	file->private_data = fh;
	fh->layer = layer;
	fh->disp_dev = disp_dev;

	if (!layer->usrs) {
		if (mutex_lock_interruptible(&layer->opslock))
			return -ERESTARTSYS;
		/* First claim the layer for this device */
		err = osd_device->ops.request_layer(osd_device,
						layer->layer_info.id);
		mutex_unlock(&layer->opslock);
		if (err < 0) {
			/* Couldn't get layer */
			v4l2_err(&vpbe_dev->v4l2_dev,
				"Display Manager failed to allocate layer\n");
			kfree(fh);
			return -EINVAL;
		}
	}
	/* Increment layer usrs counter */
	layer->usrs++;
	/* Set io_allowed member to false */
	fh->io_allowed = 0;
	v4l2_fh_add(&fh->fh);
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe display device opened successfully\n");
	return 0;
}

/*
 * vpbe_display_release()
 * This function deletes buffer queue, frees the buffers and the davinci
 * display file * handle
 */
static int vpbe_display_release(struct file *file)
{
	/* Get the layer object and file handle object */
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_release\n");

	mutex_lock(&layer->opslock);
	/* if this instance is doing IO */
	if (fh->io_allowed) {
		/* Reset io_usrs member of layer object */
		layer->io_usrs = 0;

		osd_device->ops.disable_layer(osd_device,
				layer->layer_info.id);
		layer->started = 0;
		/* Free buffers allocated */
		vb2_queue_release(&layer->buffer_queue);
		vb2_dma_contig_cleanup_ctx(&layer->buffer_queue);
	}

	/* Decrement layer usrs counter */
	layer->usrs--;
	/* If this file handle has initialize encoder device, reset it */
	if (!layer->usrs) {
		if (cfg->pixfmt == PIXFMT_NV12) {
			struct vpbe_layer *otherlayer;
			otherlayer =
			_vpbe_display_get_other_win_layer(disp_dev, layer);
			osd_device->ops.disable_layer(osd_device,
					otherlayer->layer_info.id);
			osd_device->ops.release_layer(osd_device,
					otherlayer->layer_info.id);
		}
		osd_device->ops.disable_layer(osd_device,
				layer->layer_info.id);
		osd_device->ops.release_layer(osd_device,
				layer->layer_info.id);
	}

	v4l2_fh_del(&fh->fh);
	v4l2_fh_exit(&fh->fh);
	file->private_data = NULL;
	mutex_unlock(&layer->opslock);

	/* Free memory allocated to file handle object */
	kfree(fh);

	disp_dev->cbcr_ofst = 0;

	return 0;
}

/* vpbe capture ioctl operations */
static const struct v4l2_ioctl_ops vpbe_ioctl_ops = {
	.vidioc_querycap	 = vpbe_display_querycap,
	.vidioc_g_fmt_vid_out    = vpbe_display_g_fmt,
	.vidioc_enum_fmt_vid_out = vpbe_display_enum_fmt,
	.vidioc_s_fmt_vid_out    = vpbe_display_s_fmt,
	.vidioc_try_fmt_vid_out  = vpbe_display_try_fmt,
	.vidioc_reqbufs		 = vpbe_display_reqbufs,
	.vidioc_querybuf	 = vpbe_display_querybuf,
	.vidioc_qbuf		 = vpbe_display_qbuf,
	.vidioc_dqbuf		 = vpbe_display_dqbuf,
	.vidioc_streamon	 = vpbe_display_streamon,
	.vidioc_streamoff	 = vpbe_display_streamoff,
	.vidioc_cropcap		 = vpbe_display_cropcap,
	.vidioc_g_crop		 = vpbe_display_g_crop,
	.vidioc_s_crop		 = vpbe_display_s_crop,
	.vidioc_s_std		 = vpbe_display_s_std,
	.vidioc_g_std		 = vpbe_display_g_std,
	.vidioc_enum_output	 = vpbe_display_enum_output,
	.vidioc_s_output	 = vpbe_display_s_output,
	.vidioc_g_output	 = vpbe_display_g_output,
	.vidioc_s_dv_timings	 = vpbe_display_s_dv_timings,
	.vidioc_g_dv_timings	 = vpbe_display_g_dv_timings,
	.vidioc_enum_dv_timings	 = vpbe_display_enum_dv_timings,
};

static struct v4l2_file_operations vpbe_fops = {
	.owner = THIS_MODULE,
	.open = vpbe_display_open,
	.release = vpbe_display_release,
	.unlocked_ioctl = video_ioctl2,
	.mmap = vpbe_display_mmap,
	.poll = vpbe_display_poll
};

static int vpbe_device_get(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct vpbe_display *vpbe_disp  = data;

	if (strcmp("vpbe_controller", pdev->name) == 0)
		vpbe_disp->vpbe_dev = platform_get_drvdata(pdev);

	if (strstr(pdev->name, "vpbe-osd") != NULL)
		vpbe_disp->osd_device = platform_get_drvdata(pdev);

	return 0;
}

static int init_vpbe_layer(int i, struct vpbe_display *disp_dev,
			   struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer = NULL;
	struct video_device *vbd = NULL;

	/* Allocate memory for four plane display objects */

	disp_dev->dev[i] =
		kzalloc(sizeof(struct vpbe_layer), GFP_KERNEL);

	/* If memory allocation fails, return error */
	if (!disp_dev->dev[i]) {
		printk(KERN_ERR "ran out of memory\n");
		return  -ENOMEM;
	}
	spin_lock_init(&disp_dev->dev[i]->irqlock);
	mutex_init(&disp_dev->dev[i]->opslock);

	/* Get the pointer to the layer object */
	vpbe_display_layer = disp_dev->dev[i];
	vbd = &vpbe_display_layer->video_dev;
	/* Initialize field of video device */
	vbd->release	= video_device_release_empty;
	vbd->fops	= &vpbe_fops;
	vbd->ioctl_ops	= &vpbe_ioctl_ops;
	vbd->minor	= -1;
	vbd->v4l2_dev   = &disp_dev->vpbe_dev->v4l2_dev;
	vbd->lock	= &vpbe_display_layer->opslock;
	vbd->vfl_dir	= VFL_DIR_TX;

	if (disp_dev->vpbe_dev->current_timings.timings_type &
			VPBE_ENC_STD)
		vbd->tvnorms = (V4L2_STD_525_60 | V4L2_STD_625_50);

	snprintf(vbd->name, sizeof(vbd->name),
			"DaVinci_VPBE Display_DRIVER_V%d.%d.%d",
			(VPBE_DISPLAY_VERSION_CODE >> 16) & 0xff,
			(VPBE_DISPLAY_VERSION_CODE >> 8) & 0xff,
			(VPBE_DISPLAY_VERSION_CODE) & 0xff);

	vpbe_display_layer->device_id = i;

	vpbe_display_layer->layer_info.id =
		((i == VPBE_DISPLAY_DEVICE_0) ? WIN_VID0 : WIN_VID1);


	return 0;
}

static int register_device(struct vpbe_layer *vpbe_display_layer,
			   struct vpbe_display *disp_dev,
			   struct platform_device *pdev)
{
	int err;

	v4l2_info(&disp_dev->vpbe_dev->v4l2_dev,
		  "Trying to register VPBE display device.\n");
	v4l2_info(&disp_dev->vpbe_dev->v4l2_dev,
		  "layer=%x,layer->video_dev=%x\n",
		  (int)vpbe_display_layer,
		  (int)&vpbe_display_layer->video_dev);

	err = video_register_device(&vpbe_display_layer->video_dev,
				    VFL_TYPE_GRABBER,
				    -1);
	if (err)
		return -ENODEV;

	vpbe_display_layer->disp_dev = disp_dev;
	/* set the driver data in platform device */
	platform_set_drvdata(pdev, disp_dev);
	set_bit(V4L2_FL_USE_FH_PRIO, &vpbe_display_layer->video_dev.flags);
	video_set_drvdata(&vpbe_display_layer->video_dev,
			  vpbe_display_layer);

	return 0;
}



/*
 * vpbe_display_probe()
 * This function creates device entries by register itself to the V4L2 driver
 * and initializes fields of each layer objects
 */
static int vpbe_display_probe(struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer;
	struct vpbe_display *disp_dev;
	struct resource *res = NULL;
	int k;
	int i;
	int err;
	int irq;

	printk(KERN_DEBUG "vpbe_display_probe\n");
	/* Allocate memory for vpbe_display */
	disp_dev = devm_kzalloc(&pdev->dev, sizeof(struct vpbe_display),
				GFP_KERNEL);
	if (!disp_dev)
		return -ENOMEM;

	spin_lock_init(&disp_dev->dma_queue_lock);
	/*
	 * Scan all the platform devices to find the vpbe
	 * controller device and get the vpbe_dev object
	 */
	err = bus_for_each_dev(&platform_bus_type, NULL, disp_dev,
			vpbe_device_get);
	if (err < 0)
		return err;
	/* Initialize the vpbe display controller */
	if (NULL != disp_dev->vpbe_dev->ops.initialize) {
		err = disp_dev->vpbe_dev->ops.initialize(&pdev->dev,
							 disp_dev->vpbe_dev);
		if (err) {
			v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
					"Error initing vpbe\n");
			err = -ENOMEM;
			goto probe_out;
		}
	}

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		if (init_vpbe_layer(i, disp_dev, pdev)) {
			err = -ENODEV;
			goto probe_out;
		}
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
			 "Unable to get VENC interrupt resource\n");
		err = -ENODEV;
		goto probe_out;
	}

	irq = res->start;
	err = devm_request_irq(&pdev->dev, irq, venc_isr, 0,
			       VPBE_DISPLAY_DRIVER, disp_dev);
	if (err) {
		v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
				"Unable to request interrupt\n");
		goto probe_out;
	}

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		if (register_device(disp_dev->dev[i], disp_dev, pdev)) {
			err = -ENODEV;
			goto probe_out;
		}
	}

	printk(KERN_DEBUG "Successfully completed the probing of vpbe v4l2 device\n");
	return 0;

probe_out:
	for (k = 0; k < VPBE_DISPLAY_MAX_DEVICES; k++) {
		/* Get the pointer to the layer object */
		vpbe_display_layer = disp_dev->dev[k];
		/* Unregister video device */
		if (vpbe_display_layer) {
			video_unregister_device(
				&vpbe_display_layer->video_dev);
				kfree(disp_dev->dev[k]);
		}
	}
	return err;
}

/*
 * vpbe_display_remove()
 * It un-register hardware layer from V4L2 driver
 */
static int vpbe_display_remove(struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer;
	struct vpbe_display *disp_dev = platform_get_drvdata(pdev);
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int i;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_remove\n");

	/* deinitialize the vpbe display controller */
	if (NULL != vpbe_dev->ops.deinitialize)
		vpbe_dev->ops.deinitialize(&pdev->dev, vpbe_dev);
	/* un-register device */
	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		/* Get the pointer to the layer object */
		vpbe_display_layer = disp_dev->dev[i];
		/* Unregister video device */
		video_unregister_device(&vpbe_display_layer->video_dev);

	}
	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		kfree(disp_dev->dev[i]);
		disp_dev->dev[i] = NULL;
	}

	return 0;
}

static struct platform_driver vpbe_display_driver = {
	.driver = {
		.name = VPBE_DISPLAY_DRIVER,
		.owner = THIS_MODULE,
		.bus = &platform_bus_type,
	},
	.probe = vpbe_display_probe,
	.remove = vpbe_display_remove,
};

module_platform_driver(vpbe_display_driver);

MODULE_DESCRIPTION("TI DM644x/DM355/DM365 VPBE Display controller");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments");