summaryrefslogtreecommitdiff
path: root/drivers/media/platform/exynos4-is/media-dev.c
blob: e79ddbb1e14fc0bd8c1b56504183a927edcdec83 (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
/*
 * S5P/EXYNOS4 SoC series camera host interface media device driver
 *
 * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 2 of the License,
 * or (at your option) any later version.
 */

#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-of.h>
#include <media/media-device.h>
#include <media/drv-intf/exynos-fimc.h>

#include "media-dev.h"
#include "fimc-core.h"
#include "fimc-is.h"
#include "fimc-lite.h"
#include "mipi-csis.h"

/* Set up image sensor subdev -> FIMC capture node notifications. */
static void __setup_sensor_notification(struct fimc_md *fmd,
					struct v4l2_subdev *sensor,
					struct v4l2_subdev *fimc_sd)
{
	struct fimc_source_info *src_inf;
	struct fimc_sensor_info *md_si;
	unsigned long flags;

	src_inf = v4l2_get_subdev_hostdata(sensor);
	if (!src_inf || WARN_ON(fmd == NULL))
		return;

	md_si = source_to_sensor_info(src_inf);
	spin_lock_irqsave(&fmd->slock, flags);
	md_si->host = v4l2_get_subdevdata(fimc_sd);
	spin_unlock_irqrestore(&fmd->slock, flags);
}

/**
 * fimc_pipeline_prepare - update pipeline information with subdevice pointers
 * @me: media entity terminating the pipeline
 *
 * Caller holds the graph mutex.
 */
static void fimc_pipeline_prepare(struct fimc_pipeline *p,
					struct media_entity *me)
{
	struct fimc_md *fmd = entity_to_fimc_mdev(me);
	struct v4l2_subdev *sd;
	struct v4l2_subdev *sensor = NULL;
	int i;

	for (i = 0; i < IDX_MAX; i++)
		p->subdevs[i] = NULL;

	while (1) {
		struct media_pad *pad = NULL;

		/* Find remote source pad */
		for (i = 0; i < me->num_pads; i++) {
			struct media_pad *spad = &me->pads[i];
			if (!(spad->flags & MEDIA_PAD_FL_SINK))
				continue;
			pad = media_entity_remote_pad(spad);
			if (pad)
				break;
		}

		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
			break;
		sd = media_entity_to_v4l2_subdev(pad->entity);

		switch (sd->grp_id) {
		case GRP_ID_SENSOR:
			sensor = sd;
			/* fall through */
		case GRP_ID_FIMC_IS_SENSOR:
			p->subdevs[IDX_SENSOR] = sd;
			break;
		case GRP_ID_CSIS:
			p->subdevs[IDX_CSIS] = sd;
			break;
		case GRP_ID_FLITE:
			p->subdevs[IDX_FLITE] = sd;
			break;
		case GRP_ID_FIMC:
			p->subdevs[IDX_FIMC] = sd;
			break;
		case GRP_ID_FIMC_IS:
			p->subdevs[IDX_IS_ISP] = sd;
			break;
		default:
			break;
		}
		me = &sd->entity;
		if (me->num_pads == 1)
			break;
	}

	if (sensor && p->subdevs[IDX_FIMC])
		__setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
}

/**
 * __subdev_set_power - change power state of a single subdev
 * @sd: subdevice to change power state for
 * @on: 1 to enable power or 0 to disable
 *
 * Return result of s_power subdev operation or -ENXIO if sd argument
 * is NULL. Return 0 if the subdevice does not implement s_power.
 */
static int __subdev_set_power(struct v4l2_subdev *sd, int on)
{
	int *use_count;
	int ret;

	if (sd == NULL)
		return -ENXIO;

	use_count = &sd->entity.use_count;
	if (on && (*use_count)++ > 0)
		return 0;
	else if (!on && (*use_count == 0 || --(*use_count) > 0))
		return 0;
	ret = v4l2_subdev_call(sd, core, s_power, on);

	return ret != -ENOIOCTLCMD ? ret : 0;
}

/**
 * fimc_pipeline_s_power - change power state of all pipeline subdevs
 * @fimc: fimc device terminating the pipeline
 * @state: true to power on, false to power off
 *
 * Needs to be called with the graph mutex held.
 */
static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
{
	static const u8 seq[2][IDX_MAX - 1] = {
		{ IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
		{ IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
	};
	int i, ret = 0;

	if (p->subdevs[IDX_SENSOR] == NULL)
		return -ENXIO;

	for (i = 0; i < IDX_MAX - 1; i++) {
		unsigned int idx = seq[on][i];

		ret = __subdev_set_power(p->subdevs[idx], on);


		if (ret < 0 && ret != -ENXIO)
			goto error;
	}
	return 0;
error:
	for (; i >= 0; i--) {
		unsigned int idx = seq[on][i];
		__subdev_set_power(p->subdevs[idx], !on);
	}
	return ret;
}

/**
 * __fimc_pipeline_enable - enable power of all pipeline subdevs
 *			    and the sensor clock
 * @ep: video pipeline structure
 * @fmd: fimc media device
 *
 * Called with the graph mutex held.
 */
static int __fimc_pipeline_enable(struct exynos_media_pipeline *ep,
				  struct fimc_md *fmd)
{
	struct fimc_pipeline *p = to_fimc_pipeline(ep);
	int ret;

	/* Enable PXLASYNC clock if this pipeline includes FIMC-IS */
	if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
		ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
		if (ret < 0)
			return ret;
	}

	ret = fimc_pipeline_s_power(p, 1);
	if (!ret)
		return 0;

	if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
		clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);

	return ret;
}

/**
 * __fimc_pipeline_open - update the pipeline information, enable power
 *                        of all pipeline subdevs and the sensor clock
 * @me: media entity to start graph walk with
 * @prepare: true to walk the current pipeline and acquire all subdevs
 *
 * Called with the graph mutex held.
 */
static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
				struct media_entity *me, bool prepare)
{
	struct fimc_md *fmd = entity_to_fimc_mdev(me);
	struct fimc_pipeline *p = to_fimc_pipeline(ep);
	struct v4l2_subdev *sd;

	if (WARN_ON(p == NULL || me == NULL))
		return -EINVAL;

	if (prepare)
		fimc_pipeline_prepare(p, me);

	sd = p->subdevs[IDX_SENSOR];
	if (sd == NULL) {
		pr_warn("%s(): No sensor subdev\n", __func__);
		/*
		 * Pipeline open cannot fail so as to make it possible
		 * for the user space to configure the pipeline.
		 */
		return 0;
	}

	return __fimc_pipeline_enable(ep, fmd);
}

/**
 * __fimc_pipeline_close - disable the sensor clock and pipeline power
 * @fimc: fimc device terminating the pipeline
 *
 * Disable power of all subdevs and turn the external sensor clock off.
 */
static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
{
	struct fimc_pipeline *p = to_fimc_pipeline(ep);
	struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
	struct fimc_md *fmd;
	int ret;

	if (sd == NULL) {
		pr_warn("%s(): No sensor subdev\n", __func__);
		return 0;
	}

	ret = fimc_pipeline_s_power(p, 0);

	fmd = entity_to_fimc_mdev(&sd->entity);

	/* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
	if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
		clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);

	return ret == -ENXIO ? 0 : ret;
}

/**
 * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 * @pipeline: video pipeline structure
 * @on: passed as the s_stream() callback argument
 */
static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
{
	static const u8 seq[2][IDX_MAX] = {
		{ IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
		{ IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
	};
	struct fimc_pipeline *p = to_fimc_pipeline(ep);
	struct fimc_md *fmd = entity_to_fimc_mdev(&p->subdevs[IDX_CSIS]->entity);
	enum fimc_subdev_index sd_id;
	int i, ret = 0;

	if (p->subdevs[IDX_SENSOR] == NULL) {
		if (!fmd->user_subdev_api) {
			/*
			 * Sensor must be already discovered if we
			 * aren't in the user_subdev_api mode
			 */
			return -ENODEV;
		}

		/* Get pipeline sink entity */
		if (p->subdevs[IDX_FIMC])
			sd_id = IDX_FIMC;
		else if (p->subdevs[IDX_IS_ISP])
			sd_id = IDX_IS_ISP;
		else if (p->subdevs[IDX_FLITE])
			sd_id = IDX_FLITE;
		else
			return -ENODEV;

		/*
		 * Sensor could have been linked between open and STREAMON -
		 * check if this is the case.
		 */
		fimc_pipeline_prepare(p, &p->subdevs[sd_id]->entity);

		if (p->subdevs[IDX_SENSOR] == NULL)
			return -ENODEV;

		ret = __fimc_pipeline_enable(ep, fmd);
		if (ret < 0)
			return ret;

	}

	for (i = 0; i < IDX_MAX; i++) {
		unsigned int idx = seq[on][i];

		ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);

		if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
			goto error;
	}

	return 0;
error:
	fimc_pipeline_s_power(p, !on);
	for (; i >= 0; i--) {
		unsigned int idx = seq[on][i];
		v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
	}
	return ret;
}

/* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
	.open		= __fimc_pipeline_open,
	.close		= __fimc_pipeline_close,
	.set_stream	= __fimc_pipeline_s_stream,
};

static struct exynos_media_pipeline *fimc_md_pipeline_create(
						struct fimc_md *fmd)
{
	struct fimc_pipeline *p;

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return NULL;

	list_add_tail(&p->list, &fmd->pipelines);

	p->ep.ops = &fimc_pipeline_ops;
	return &p->ep;
}

static void fimc_md_pipelines_free(struct fimc_md *fmd)
{
	while (!list_empty(&fmd->pipelines)) {
		struct fimc_pipeline *p;

		p = list_entry(fmd->pipelines.next, typeof(*p), list);
		list_del(&p->list);
		kfree(p);
	}
}

/* Parse port node and register as a sub-device any sensor specified there. */
static int fimc_md_parse_port_node(struct fimc_md *fmd,
				   struct device_node *port,
				   unsigned int index)
{
	struct fimc_source_info *pd = &fmd->sensor[index].pdata;
	struct device_node *rem, *ep, *np;
	struct v4l2_of_endpoint endpoint;

	/* Assume here a port node can have only one endpoint node. */
	ep = of_get_next_child(port, NULL);
	if (!ep)
		return 0;

	v4l2_of_parse_endpoint(ep, &endpoint);
	if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS)
		return -EINVAL;

	pd->mux_id = (endpoint.base.port - 1) & 0x1;

	rem = of_graph_get_remote_port_parent(ep);
	of_node_put(ep);
	if (rem == NULL) {
		v4l2_info(&fmd->v4l2_dev, "Remote device at %s not found\n",
							ep->full_name);
		return 0;
	}

	if (fimc_input_is_parallel(endpoint.base.port)) {
		if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
			pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
		else
			pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
		pd->flags = endpoint.bus.parallel.flags;
	} else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
		/*
		 * MIPI CSI-2: only input mux selection and
		 * the sensor's clock frequency is needed.
		 */
		pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
	} else {
		v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %s\n",
			 endpoint.base.port, rem->full_name);
	}
	/*
	 * For FIMC-IS handled sensors, that are placed under i2c-isp device
	 * node, FIMC is connected to the FIMC-IS through its ISP Writeback
	 * input. Sensors are attached to the FIMC-LITE hostdata interface
	 * directly or through MIPI-CSIS, depending on the external media bus
	 * used. This needs to be handled in a more reliable way, not by just
	 * checking parent's node name.
	 */
	np = of_get_parent(rem);

	if (np && !of_node_cmp(np->name, "i2c-isp"))
		pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
	else
		pd->fimc_bus_type = pd->sensor_bus_type;

	if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor)))
		return -EINVAL;

	fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
	fmd->sensor[index].asd.match.of.node = rem;
	fmd->async_subdevs[index] = &fmd->sensor[index].asd;

	fmd->num_sensors++;

	of_node_put(rem);
	return 0;
}

/* Register all SoC external sub-devices */
static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
{
	struct device_node *parent = fmd->pdev->dev.of_node;
	struct device_node *node, *ports;
	int index = 0;
	int ret;

	/*
	 * Runtime resume one of the FIMC entities to make sure
	 * the sclk_cam clocks are not globally disabled.
	 */
	if (!fmd->pmf)
		return -ENXIO;

	ret = pm_runtime_get_sync(fmd->pmf);
	if (ret < 0)
		return ret;

	fmd->num_sensors = 0;

	/* Attach sensors linked to MIPI CSI-2 receivers */
	for_each_available_child_of_node(parent, node) {
		struct device_node *port;

		if (of_node_cmp(node->name, "csis"))
			continue;
		/* The csis node can have only port subnode. */
		port = of_get_next_child(node, NULL);
		if (!port)
			continue;

		ret = fimc_md_parse_port_node(fmd, port, index);
		if (ret < 0)
			goto rpm_put;
		index++;
	}

	/* Attach sensors listed in the parallel-ports node */
	ports = of_get_child_by_name(parent, "parallel-ports");
	if (!ports)
		goto rpm_put;

	for_each_child_of_node(ports, node) {
		ret = fimc_md_parse_port_node(fmd, node, index);
		if (ret < 0)
			break;
		index++;
	}
rpm_put:
	pm_runtime_put(fmd->pmf);
	return ret;
}

static int __of_get_csis_id(struct device_node *np)
{
	u32 reg = 0;

	np = of_get_child_by_name(np, "port");
	if (!np)
		return -EINVAL;
	of_property_read_u32(np, "reg", &reg);
	return reg - FIMC_INPUT_MIPI_CSI2_0;
}

/*
 * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 */
static int register_fimc_lite_entity(struct fimc_md *fmd,
				     struct fimc_lite *fimc_lite)
{
	struct v4l2_subdev *sd;
	struct exynos_media_pipeline *ep;
	int ret;

	if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
		    fmd->fimc_lite[fimc_lite->index]))
		return -EBUSY;

	sd = &fimc_lite->subdev;
	sd->grp_id = GRP_ID_FLITE;

	ep = fimc_md_pipeline_create(fmd);
	if (!ep)
		return -ENOMEM;

	v4l2_set_subdev_hostdata(sd, ep);

	ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
	if (!ret)
		fmd->fimc_lite[fimc_lite->index] = fimc_lite;
	else
		v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
			 fimc_lite->index);
	return ret;
}

static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
{
	struct v4l2_subdev *sd;
	struct exynos_media_pipeline *ep;
	int ret;

	if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
		return -EBUSY;

	sd = &fimc->vid_cap.subdev;
	sd->grp_id = GRP_ID_FIMC;

	ep = fimc_md_pipeline_create(fmd);
	if (!ep)
		return -ENOMEM;

	v4l2_set_subdev_hostdata(sd, ep);

	ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
	if (!ret) {
		if (!fmd->pmf && fimc->pdev)
			fmd->pmf = &fimc->pdev->dev;
		fmd->fimc[fimc->id] = fimc;
		fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
	} else {
		v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
			 fimc->id, ret);
	}
	return ret;
}

static int register_csis_entity(struct fimc_md *fmd,
				struct platform_device *pdev,
				struct v4l2_subdev *sd)
{
	struct device_node *node = pdev->dev.of_node;
	int id, ret;

	id = node ? __of_get_csis_id(node) : max(0, pdev->id);

	if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
		return -ENOENT;

	if (WARN_ON(fmd->csis[id].sd))
		return -EBUSY;

	sd->grp_id = GRP_ID_CSIS;
	ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
	if (!ret)
		fmd->csis[id].sd = sd;
	else
		v4l2_err(&fmd->v4l2_dev,
			 "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
	return ret;
}

static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
{
	struct v4l2_subdev *sd = &is->isp.subdev;
	struct exynos_media_pipeline *ep;
	int ret;

	/* Allocate pipeline object for the ISP capture video node. */
	ep = fimc_md_pipeline_create(fmd);
	if (!ep)
		return -ENOMEM;

	v4l2_set_subdev_hostdata(sd, ep);

	ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
	if (ret) {
		v4l2_err(&fmd->v4l2_dev,
			 "Failed to register FIMC-ISP (%d)\n", ret);
		return ret;
	}

	fmd->fimc_is = is;
	return 0;
}

static int fimc_md_register_platform_entity(struct fimc_md *fmd,
					    struct platform_device *pdev,
					    int plat_entity)
{
	struct device *dev = &pdev->dev;
	int ret = -EPROBE_DEFER;
	void *drvdata;

	/* Lock to ensure dev->driver won't change. */
	device_lock(dev);

	if (!dev->driver || !try_module_get(dev->driver->owner))
		goto dev_unlock;

	drvdata = dev_get_drvdata(dev);
	/* Some subdev didn't probe successfully id drvdata is NULL */
	if (drvdata) {
		switch (plat_entity) {
		case IDX_FIMC:
			ret = register_fimc_entity(fmd, drvdata);
			break;
		case IDX_FLITE:
			ret = register_fimc_lite_entity(fmd, drvdata);
			break;
		case IDX_CSIS:
			ret = register_csis_entity(fmd, pdev, drvdata);
			break;
		case IDX_IS_ISP:
			ret = register_fimc_is_entity(fmd, drvdata);
			break;
		default:
			ret = -ENODEV;
		}
	}

	module_put(dev->driver->owner);
dev_unlock:
	device_unlock(dev);
	if (ret == -EPROBE_DEFER)
		dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
			dev_name(dev));
	else if (ret < 0)
		dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
			dev_name(dev), ret);
	return ret;
}

/* Register FIMC, FIMC-LITE and CSIS media entities */
static int fimc_md_register_platform_entities(struct fimc_md *fmd,
					      struct device_node *parent)
{
	struct device_node *node;
	int ret = 0;

	for_each_available_child_of_node(parent, node) {
		struct platform_device *pdev;
		int plat_entity = -1;

		pdev = of_find_device_by_node(node);
		if (!pdev)
			continue;

		/* If driver of any entity isn't ready try all again later. */
		if (!strcmp(node->name, CSIS_OF_NODE_NAME))
			plat_entity = IDX_CSIS;
		else if	(!strcmp(node->name, FIMC_IS_OF_NODE_NAME))
			plat_entity = IDX_IS_ISP;
		else if (!strcmp(node->name, FIMC_LITE_OF_NODE_NAME))
			plat_entity = IDX_FLITE;
		else if	(!strcmp(node->name, FIMC_OF_NODE_NAME) &&
			 !of_property_read_bool(node, "samsung,lcd-wb"))
			plat_entity = IDX_FIMC;

		if (plat_entity >= 0)
			ret = fimc_md_register_platform_entity(fmd, pdev,
							plat_entity);
		put_device(&pdev->dev);
		if (ret < 0)
			break;
	}

	return ret;
}

static void fimc_md_unregister_entities(struct fimc_md *fmd)
{
	int i;

	for (i = 0; i < FIMC_MAX_DEVS; i++) {
		struct fimc_dev *dev = fmd->fimc[i];
		if (dev == NULL)
			continue;
		v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
		dev->vid_cap.ve.pipe = NULL;
		fmd->fimc[i] = NULL;
	}
	for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
		struct fimc_lite *dev = fmd->fimc_lite[i];
		if (dev == NULL)
			continue;
		v4l2_device_unregister_subdev(&dev->subdev);
		dev->ve.pipe = NULL;
		fmd->fimc_lite[i] = NULL;
	}
	for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
		if (fmd->csis[i].sd == NULL)
			continue;
		v4l2_device_unregister_subdev(fmd->csis[i].sd);
		fmd->csis[i].sd = NULL;
	}

	if (fmd->fimc_is)
		v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);

	v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
}

/**
 * __fimc_md_create_fimc_links - create links to all FIMC entities
 * @fmd: fimc media device
 * @source: the source entity to create links to all fimc entities from
 * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 * @pad: the source entity pad index
 * @link_mask: bitmask of the fimc devices for which link should be enabled
 */
static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
					    struct media_entity *source,
					    struct v4l2_subdev *sensor,
					    int pad, int link_mask)
{
	struct fimc_source_info *si = NULL;
	struct media_entity *sink;
	unsigned int flags = 0;
	int i, ret = 0;

	if (sensor) {
		si = v4l2_get_subdev_hostdata(sensor);
		/* Skip direct FIMC links in the logical FIMC-IS sensor path */
		if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
			ret = 1;
	}

	for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
		if (!fmd->fimc[i])
			continue;
		/*
		 * Some FIMC variants are not fitted with camera capture
		 * interface. Skip creating a link from sensor for those.
		 */
		if (!fmd->fimc[i]->variant->has_cam_if)
			continue;

		flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;

		sink = &fmd->fimc[i]->vid_cap.subdev.entity;
		ret = media_create_pad_link(source, pad, sink,
					      FIMC_SD_PAD_SINK_CAM, flags);
		if (ret)
			return ret;

		/* Notify FIMC capture subdev entity */
		ret = media_entity_call(sink, link_setup, &sink->pads[0],
					&source->pads[pad], flags);
		if (ret)
			break;

		v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
			  source->name, flags ? '=' : '-', sink->name);
	}

	for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
		if (!fmd->fimc_lite[i])
			continue;

		sink = &fmd->fimc_lite[i]->subdev.entity;
		ret = media_create_pad_link(source, pad, sink,
					       FLITE_SD_PAD_SINK, 0);
		if (ret)
			return ret;

		/* Notify FIMC-LITE subdev entity */
		ret = media_entity_call(sink, link_setup, &sink->pads[0],
					&source->pads[pad], 0);
		if (ret)
			break;

		v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
			  source->name, sink->name);
	}
	return 0;
}

/* Create links from FIMC-LITE source pads to other entities */
static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
{
	struct media_entity *source, *sink;
	int i, ret = 0;

	for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
		struct fimc_lite *fimc = fmd->fimc_lite[i];

		if (fimc == NULL)
			continue;

		source = &fimc->subdev.entity;
		sink = &fimc->ve.vdev.entity;
		/* FIMC-LITE's subdev and video node */
		ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
					       sink, 0, 0);
		if (ret)
			break;
		/* Link from FIMC-LITE to IS-ISP subdev */
		sink = &fmd->fimc_is->isp.subdev.entity;
		ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
					       sink, 0, 0);
		if (ret)
			break;
	}

	return ret;
}

/* Create FIMC-IS links */
static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
{
	struct fimc_isp *isp = &fmd->fimc_is->isp;
	struct media_entity *source, *sink;
	int i, ret;

	source = &isp->subdev.entity;

	for (i = 0; i < FIMC_MAX_DEVS; i++) {
		if (fmd->fimc[i] == NULL)
			continue;

		/* Link from FIMC-IS-ISP subdev to FIMC */
		sink = &fmd->fimc[i]->vid_cap.subdev.entity;
		ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
					       sink, FIMC_SD_PAD_SINK_FIFO, 0);
		if (ret)
			return ret;
	}

	/* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
	sink = &isp->video_capture.ve.vdev.entity;

	/* Skip this link if the fimc-is-isp video node driver isn't built-in */
	if (sink->num_pads == 0)
		return 0;

	return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
					sink, 0, 0);
}

/**
 * fimc_md_create_links - create default links between registered entities
 *
 * Parallel interface sensor entities are connected directly to FIMC capture
 * entities. The sensors using MIPI CSIS bus are connected through immutable
 * link with CSI receiver entity specified by mux_id. Any registered CSIS
 * entity has a link to each registered FIMC capture entity. Enabled links
 * are created by default between each subsequent registered sensor and
 * subsequent FIMC capture entity. The number of default active links is
 * determined by the number of available sensors or FIMC entities,
 * whichever is less.
 */
static int fimc_md_create_links(struct fimc_md *fmd)
{
	struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
	struct v4l2_subdev *sensor, *csis;
	struct fimc_source_info *pdata;
	struct media_entity *source, *sink;
	int i, pad, fimc_id = 0, ret = 0;
	u32 flags, link_mask = 0;

	for (i = 0; i < fmd->num_sensors; i++) {
		if (fmd->sensor[i].subdev == NULL)
			continue;

		sensor = fmd->sensor[i].subdev;
		pdata = v4l2_get_subdev_hostdata(sensor);
		if (!pdata)
			continue;

		source = NULL;

		switch (pdata->sensor_bus_type) {
		case FIMC_BUS_TYPE_MIPI_CSI2:
			if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
				"Wrong CSI channel id: %d\n", pdata->mux_id))
				return -EINVAL;

			csis = fmd->csis[pdata->mux_id].sd;
			if (WARN(csis == NULL,
				 "MIPI-CSI interface specified "
				 "but s5p-csis module is not loaded!\n"))
				return -EINVAL;

			pad = sensor->entity.num_pads - 1;
			ret = media_create_pad_link(&sensor->entity, pad,
					      &csis->entity, CSIS_PAD_SINK,
					      MEDIA_LNK_FL_IMMUTABLE |
					      MEDIA_LNK_FL_ENABLED);
			if (ret)
				return ret;

			v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
				  sensor->entity.name, csis->entity.name);

			source = NULL;
			csi_sensors[pdata->mux_id] = sensor;
			break;

		case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
			source = &sensor->entity;
			pad = 0;
			break;

		default:
			v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
				 pdata->sensor_bus_type);
			return -EINVAL;
		}
		if (source == NULL)
			continue;

		link_mask = 1 << fimc_id++;
		ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
						       pad, link_mask);
	}

	for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
		if (fmd->csis[i].sd == NULL)
			continue;

		source = &fmd->csis[i].sd->entity;
		pad = CSIS_PAD_SOURCE;
		sensor = csi_sensors[i];

		link_mask = 1 << fimc_id++;
		ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
						       pad, link_mask);
	}

	/* Create immutable links between each FIMC's subdev and video node */
	flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
	for (i = 0; i < FIMC_MAX_DEVS; i++) {
		if (!fmd->fimc[i])
			continue;

		source = &fmd->fimc[i]->vid_cap.subdev.entity;
		sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;

		ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
					      sink, 0, flags);
		if (ret)
			break;
	}

	ret = __fimc_md_create_flite_source_links(fmd);
	if (ret < 0)
		return ret;

	if (fmd->use_isp)
		ret = __fimc_md_create_fimc_is_links(fmd);

	return ret;
}

/*
 * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
 */
static void fimc_md_put_clocks(struct fimc_md *fmd)
{
	int i = FIMC_MAX_CAMCLKS;

	while (--i >= 0) {
		if (IS_ERR(fmd->camclk[i].clock))
			continue;
		clk_put(fmd->camclk[i].clock);
		fmd->camclk[i].clock = ERR_PTR(-EINVAL);
	}

	/* Writeback (PIXELASYNCMx) clocks */
	for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
		if (IS_ERR(fmd->wbclk[i]))
			continue;
		clk_put(fmd->wbclk[i]);
		fmd->wbclk[i] = ERR_PTR(-EINVAL);
	}
}

static int fimc_md_get_clocks(struct fimc_md *fmd)
{
	struct device *dev = &fmd->pdev->dev;
	char clk_name[32];
	struct clk *clock;
	int i, ret = 0;

	for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
		fmd->camclk[i].clock = ERR_PTR(-EINVAL);

	for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
		snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
		clock = clk_get(dev, clk_name);

		if (IS_ERR(clock)) {
			dev_err(dev, "Failed to get clock: %s\n", clk_name);
			ret = PTR_ERR(clock);
			break;
		}
		fmd->camclk[i].clock = clock;
	}
	if (ret)
		fimc_md_put_clocks(fmd);

	if (!fmd->use_isp)
		return 0;
	/*
	 * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
	 * leave PIXELASYNCM0 out for the LCD Writeback driver.
	 */
	fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);

	for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
		snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
		clock = clk_get(dev, clk_name);
		if (IS_ERR(clock)) {
			v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
				  clk_name);
			ret = PTR_ERR(clock);
			break;
		}
		fmd->wbclk[i] = clock;
	}
	if (ret)
		fimc_md_put_clocks(fmd);

	return ret;
}

static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
{
	struct exynos_video_entity *ve;
	struct fimc_pipeline *p;
	struct video_device *vdev;
	int ret;

	vdev = media_entity_to_video_device(entity);
	if (vdev->entity.use_count == 0)
		return 0;

	ve = vdev_to_exynos_video_entity(vdev);
	p = to_fimc_pipeline(ve->pipe);
	/*
	 * Nothing to do if we are disabling the pipeline, some link
	 * has been disconnected and p->subdevs array is cleared now.
	 */
	if (!enable && p->subdevs[IDX_SENSOR] == NULL)
		return 0;

	if (enable)
		ret = __fimc_pipeline_open(ve->pipe, entity, true);
	else
		ret = __fimc_pipeline_close(ve->pipe);

	if (ret == 0 && !enable)
		memset(p->subdevs, 0, sizeof(p->subdevs));

	return ret;
}

/* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
				      struct media_entity_graph *graph)
{
	struct media_entity *entity_err = entity;
	int ret;

	/*
	 * Walk current graph and call the pipeline open/close routine for each
	 * opened video node that belongs to the graph of entities connected
	 * through active links. This is needed as we cannot power on/off the
	 * subdevs in random order.
	 */
	media_entity_graph_walk_start(graph, entity);

	while ((entity = media_entity_graph_walk_next(graph))) {
		if (!is_media_entity_v4l2_io(entity))
			continue;

		ret  = __fimc_md_modify_pipeline(entity, enable);

		if (ret < 0)
			goto err;
	}

	return 0;

err:
	media_entity_graph_walk_start(graph, entity_err);

	while ((entity_err = media_entity_graph_walk_next(graph))) {
		if (!is_media_entity_v4l2_io(entity_err))
			continue;

		__fimc_md_modify_pipeline(entity_err, !enable);

		if (entity_err == entity)
			break;
	}

	return ret;
}

static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
				unsigned int notification)
{
	struct media_entity_graph *graph =
		&container_of(link->graph_obj.mdev, struct fimc_md,
			      media_dev)->link_setup_graph;
	struct media_entity *sink = link->sink->entity;
	int ret = 0;

	/* Before link disconnection */
	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
		ret = media_entity_graph_walk_init(graph,
						   link->graph_obj.mdev);
		if (ret)
			return ret;
		if (!(flags & MEDIA_LNK_FL_ENABLED))
			ret = __fimc_md_modify_pipelines(sink, false, graph);
#if 0
		else
			/* TODO: Link state change validation */
#endif
	/* After link activation */
	} else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
		if (link->flags & MEDIA_LNK_FL_ENABLED)
			ret = __fimc_md_modify_pipelines(sink, true, graph);
		media_entity_graph_walk_cleanup(graph);
	}

	return ret ? -EPIPE : 0;
}

static ssize_t fimc_md_sysfs_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct fimc_md *fmd = platform_get_drvdata(pdev);

	if (fmd->user_subdev_api)
		return strlcpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);

	return strlcpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
}

static ssize_t fimc_md_sysfs_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct fimc_md *fmd = platform_get_drvdata(pdev);
	bool subdev_api;
	int i;

	if (!strcmp(buf, "vid-dev\n"))
		subdev_api = false;
	else if (!strcmp(buf, "sub-dev\n"))
		subdev_api = true;
	else
		return count;

	fmd->user_subdev_api = subdev_api;
	for (i = 0; i < FIMC_MAX_DEVS; i++)
		if (fmd->fimc[i])
			fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
	return count;
}
/*
 * This device attribute is to select video pipeline configuration method.
 * There are following valid values:
 *  vid-dev - for V4L2 video node API only, subdevice will be configured
 *  by the host driver.
 *  sub-dev - for media controller API, subdevs must be configured in user
 *  space before starting streaming.
 */
static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
		   fimc_md_sysfs_show, fimc_md_sysfs_store);

static int fimc_md_get_pinctrl(struct fimc_md *fmd)
{
	struct device *dev = &fmd->pdev->dev;
	struct fimc_pinctrl *pctl = &fmd->pinctl;

	pctl->pinctrl = devm_pinctrl_get(dev);
	if (IS_ERR(pctl->pinctrl))
		return PTR_ERR(pctl->pinctrl);

	pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
					PINCTRL_STATE_DEFAULT);
	if (IS_ERR(pctl->state_default))
		return PTR_ERR(pctl->state_default);

	pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
					PINCTRL_STATE_IDLE);
	return 0;
}

static int cam_clk_prepare(struct clk_hw *hw)
{
	struct cam_clk *camclk = to_cam_clk(hw);
	int ret;

	if (camclk->fmd->pmf == NULL)
		return -ENODEV;

	ret = pm_runtime_get_sync(camclk->fmd->pmf);
	return ret < 0 ? ret : 0;
}

static void cam_clk_unprepare(struct clk_hw *hw)
{
	struct cam_clk *camclk = to_cam_clk(hw);

	if (camclk->fmd->pmf == NULL)
		return;

	pm_runtime_put_sync(camclk->fmd->pmf);
}

static const struct clk_ops cam_clk_ops = {
	.prepare = cam_clk_prepare,
	.unprepare = cam_clk_unprepare,
};

static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
{
	struct cam_clk_provider *cp = &fmd->clk_provider;
	unsigned int i;

	if (cp->of_node)
		of_clk_del_provider(cp->of_node);

	for (i = 0; i < cp->num_clocks; i++)
		clk_unregister(cp->clks[i]);
}

static int fimc_md_register_clk_provider(struct fimc_md *fmd)
{
	struct cam_clk_provider *cp = &fmd->clk_provider;
	struct device *dev = &fmd->pdev->dev;
	int i, ret;

	for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
		struct cam_clk *camclk = &cp->camclk[i];
		struct clk_init_data init;
		const char *p_name;

		ret = of_property_read_string_index(dev->of_node,
					"clock-output-names", i, &init.name);
		if (ret < 0)
			break;

		p_name = __clk_get_name(fmd->camclk[i].clock);

		/* It's safe since clk_register() will duplicate the string. */
		init.parent_names = &p_name;
		init.num_parents = 1;
		init.ops = &cam_clk_ops;
		init.flags = CLK_SET_RATE_PARENT;
		camclk->hw.init = &init;
		camclk->fmd = fmd;

		cp->clks[i] = clk_register(NULL, &camclk->hw);
		if (IS_ERR(cp->clks[i])) {
			dev_err(dev, "failed to register clock: %s (%ld)\n",
					init.name, PTR_ERR(cp->clks[i]));
			ret = PTR_ERR(cp->clks[i]);
			goto err;
		}
		cp->num_clocks++;
	}

	if (cp->num_clocks == 0) {
		dev_warn(dev, "clk provider not registered\n");
		return 0;
	}

	cp->clk_data.clks = cp->clks;
	cp->clk_data.clk_num = cp->num_clocks;
	cp->of_node = dev->of_node;
	ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
				  &cp->clk_data);
	if (ret == 0)
		return 0;
err:
	fimc_md_unregister_clk_provider(fmd);
	return ret;
}

static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
				 struct v4l2_subdev *subdev,
				 struct v4l2_async_subdev *asd)
{
	struct fimc_md *fmd = notifier_to_fimc_md(notifier);
	struct fimc_sensor_info *si = NULL;
	int i;

	/* Find platform data for this sensor subdev */
	for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
		if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
			si = &fmd->sensor[i];

	if (si == NULL)
		return -EINVAL;

	v4l2_set_subdev_hostdata(subdev, &si->pdata);

	if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
		subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
	else
		subdev->grp_id = GRP_ID_SENSOR;

	si->subdev = subdev;

	v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
		  subdev->name, fmd->num_sensors);

	fmd->num_sensors++;

	return 0;
}

static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
{
	struct fimc_md *fmd = notifier_to_fimc_md(notifier);
	int ret;

	mutex_lock(&fmd->media_dev.graph_mutex);

	ret = fimc_md_create_links(fmd);
	if (ret < 0)
		goto unlock;

	ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
unlock:
	mutex_unlock(&fmd->media_dev.graph_mutex);
	if (ret < 0)
		return ret;

	return media_device_register(&fmd->media_dev);
}

static int fimc_md_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct v4l2_device *v4l2_dev;
	struct fimc_md *fmd;
	int ret;

	fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
	if (!fmd)
		return -ENOMEM;

	spin_lock_init(&fmd->slock);
	INIT_LIST_HEAD(&fmd->pipelines);
	fmd->pdev = pdev;

	strlcpy(fmd->media_dev.model, "SAMSUNG S5P FIMC",
		sizeof(fmd->media_dev.model));
	fmd->media_dev.link_notify = fimc_md_link_notify;
	fmd->media_dev.dev = dev;

	v4l2_dev = &fmd->v4l2_dev;
	v4l2_dev->mdev = &fmd->media_dev;
	v4l2_dev->notify = fimc_sensor_notify;
	strlcpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));

	fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
	fmd->user_subdev_api = true;

	media_device_init(&fmd->media_dev);

	ret = v4l2_device_register(dev, &fmd->v4l2_dev);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
		return ret;
	}

	ret = fimc_md_get_clocks(fmd);
	if (ret)
		goto err_md;

	ret = fimc_md_get_pinctrl(fmd);
	if (ret < 0) {
		if (ret != EPROBE_DEFER)
			dev_err(dev, "Failed to get pinctrl: %d\n", ret);
		goto err_clk;
	}

	platform_set_drvdata(pdev, fmd);

	/* Protect the media graph while we're registering entities */
	mutex_lock(&fmd->media_dev.graph_mutex);

	ret = fimc_md_register_platform_entities(fmd, dev->of_node);
	if (ret) {
		mutex_unlock(&fmd->media_dev.graph_mutex);
		goto err_clk;
	}

	ret = fimc_md_register_sensor_entities(fmd);
	if (ret) {
		mutex_unlock(&fmd->media_dev.graph_mutex);
		goto err_m_ent;
	}

	mutex_unlock(&fmd->media_dev.graph_mutex);

	ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
	if (ret)
		goto err_m_ent;
	/*
	 * FIMC platform devices need to be registered before the sclk_cam
	 * clocks provider, as one of these devices needs to be activated
	 * to enable the clock.
	 */
	ret = fimc_md_register_clk_provider(fmd);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "clock provider registration failed\n");
		goto err_attr;
	}

	if (fmd->num_sensors > 0) {
		fmd->subdev_notifier.subdevs = fmd->async_subdevs;
		fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
		fmd->subdev_notifier.bound = subdev_notifier_bound;
		fmd->subdev_notifier.complete = subdev_notifier_complete;
		fmd->num_sensors = 0;

		ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
						&fmd->subdev_notifier);
		if (ret)
			goto err_clk_p;
	}

	return 0;

err_clk_p:
	fimc_md_unregister_clk_provider(fmd);
err_attr:
	device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
err_clk:
	fimc_md_put_clocks(fmd);
err_m_ent:
	fimc_md_unregister_entities(fmd);
err_md:
	media_device_cleanup(&fmd->media_dev);
	v4l2_device_unregister(&fmd->v4l2_dev);
	return ret;
}

static int fimc_md_remove(struct platform_device *pdev)
{
	struct fimc_md *fmd = platform_get_drvdata(pdev);

	if (!fmd)
		return 0;

	fimc_md_unregister_clk_provider(fmd);
	v4l2_async_notifier_unregister(&fmd->subdev_notifier);

	v4l2_device_unregister(&fmd->v4l2_dev);
	device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
	fimc_md_unregister_entities(fmd);
	fimc_md_pipelines_free(fmd);
	media_device_unregister(&fmd->media_dev);
	media_device_cleanup(&fmd->media_dev);
	fimc_md_put_clocks(fmd);

	return 0;
}

static const struct platform_device_id fimc_driver_ids[] __always_unused = {
	{ .name = "s5p-fimc-md" },
	{ },
};
MODULE_DEVICE_TABLE(platform, fimc_driver_ids);

static const struct of_device_id fimc_md_of_match[] = {
	{ .compatible = "samsung,fimc" },
	{ },
};
MODULE_DEVICE_TABLE(of, fimc_md_of_match);

static struct platform_driver fimc_md_driver = {
	.probe		= fimc_md_probe,
	.remove		= fimc_md_remove,
	.driver = {
		.of_match_table = of_match_ptr(fimc_md_of_match),
		.name		= "s5p-fimc-md",
	}
};

static int __init fimc_md_init(void)
{
	int ret;

	request_module("s5p-csis");
	ret = fimc_register_driver();
	if (ret)
		return ret;

	return platform_driver_register(&fimc_md_driver);
}

static void __exit fimc_md_exit(void)
{
	platform_driver_unregister(&fimc_md_driver);
	fimc_unregister_driver();
}

module_init(fimc_md_init);
module_exit(fimc_md_exit);

MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.0.1");