summaryrefslogtreecommitdiff
path: root/drivers/media/platform/s5p-fimc/fimc-mdevice.c
blob: 4ab99f3a7b0950310d89470d7be47854f4f6f219 (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
/*
 * S5P/EXYNOS4 SoC series camera host interface media device driver
 *
 * Copyright (C) 2011 Samsung Electronics Co., Ltd.
 * Contact: 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/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <media/v4l2-ctrls.h>
#include <media/media-device.h>
#include <media/s5p_fimc.h>

#include "fimc-core.h"
#include "fimc-lite.h"
#include "fimc-mdevice.h"
#include "mipi-csis.h"

static int __fimc_md_set_camclk(struct fimc_md *fmd,
				struct fimc_sensor_info *s_info,
				bool on);
/**
 * fimc_pipeline_prepare - update pipeline information with subdevice pointers
 * @fimc: fimc device terminating the pipeline
 *
 * Caller holds the graph mutex.
 */
static void fimc_pipeline_prepare(struct fimc_pipeline *p,
				  struct media_entity *me)
{
	struct media_pad *pad = &me->pads[0];
	struct v4l2_subdev *sd;
	int i;

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

	while (1) {
		if (!(pad->flags & MEDIA_PAD_FL_SINK))
			break;

		/* source pad */
		pad = media_entity_remote_source(pad);
		if (pad == NULL ||
		    media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
			break;

		sd = media_entity_to_v4l2_subdev(pad->entity);

		switch (sd->grp_id) {
		case SENSOR_GROUP_ID:
			p->subdevs[IDX_SENSOR] = sd;
			break;
		case CSIS_GROUP_ID:
			p->subdevs[IDX_CSIS] = sd;
			break;
		case FLITE_GROUP_ID:
			p->subdevs[IDX_FLITE] = sd;
			break;
		case FIMC_GROUP_ID:
			/* No need to control FIMC subdev through subdev ops */
			break;
		default:
			pr_warn("%s: Unknown subdev grp_id: %#x\n",
				__func__, sd->grp_id);
		}
		/* sink pad */
		pad = &sd->entity.pads[0];
	}
}

/**
 * __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 state)
{
	unsigned int i;
	int ret;

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

	for (i = 0; i < IDX_MAX; i++) {
		unsigned int idx = state ? (IDX_MAX - 1) - i : i;

		ret = __subdev_set_power(p->subdevs[idx], state);
		if (ret < 0 && ret != -ENXIO)
			return ret;
	}

	return 0;
}

/**
 * __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
 * @prep: true to acquire sensor (and csis) subdevs
 *
 * This function must be called with the graph mutex held.
 */
static int __fimc_pipeline_open(struct fimc_pipeline *p,
				struct media_entity *me, bool prep)
{
	int ret;

	if (prep)
		fimc_pipeline_prepare(p, me);

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

	ret = fimc_md_set_camclk(p->subdevs[IDX_SENSOR], true);
	if (ret)
		return ret;

	return fimc_pipeline_s_power(p, 1);
}

static int fimc_pipeline_open(struct fimc_pipeline *p,
			      struct media_entity *me, bool prep)
{
	int ret;

	mutex_lock(&me->parent->graph_mutex);
	ret =  __fimc_pipeline_open(p, me, prep);
	mutex_unlock(&me->parent->graph_mutex);

	return ret;
}

/**
 * __fimc_pipeline_close - disable the sensor clock and pipeline power
 * @fimc: fimc device terminating the pipeline
 *
 * Disable power of all subdevs in the pipeline and turn off the external
 * sensor clock.
 * Called with the graph mutex held.
 */
static int __fimc_pipeline_close(struct fimc_pipeline *p)
{
	int ret = 0;

	if (p->subdevs[IDX_SENSOR]) {
		ret = fimc_pipeline_s_power(p, 0);
		fimc_md_set_camclk(p->subdevs[IDX_SENSOR], false);
	}
	return ret == -ENXIO ? 0 : ret;
}

static int fimc_pipeline_close(struct fimc_pipeline *p)
{
	struct media_entity *me;
	int ret;

	if (!p || !p->subdevs[IDX_SENSOR])
		return -EINVAL;

	me = &p->subdevs[IDX_SENSOR]->entity;
	mutex_lock(&me->parent->graph_mutex);
	ret = __fimc_pipeline_close(p);
	mutex_unlock(&me->parent->graph_mutex);

	return ret;
}

/**
 * fimc_pipeline_s_stream - invoke s_stream on pipeline subdevs
 * @pipeline: video pipeline structure
 * @on: passed as the s_stream call argument
 */
static int fimc_pipeline_s_stream(struct fimc_pipeline *p, bool on)
{
	int i, ret;

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

	for (i = 0; i < IDX_MAX; i++) {
		unsigned int idx = on ? (IDX_MAX - 1) - i : i;

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

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

	return 0;

}

/* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
static const struct fimc_pipeline_ops fimc_pipeline_ops = {
	.open		= fimc_pipeline_open,
	.close		= fimc_pipeline_close,
	.set_stream	= fimc_pipeline_s_stream,
};

/*
 * Sensor subdevice helper functions
 */
static struct v4l2_subdev *fimc_md_register_sensor(struct fimc_md *fmd,
				   struct fimc_sensor_info *s_info)
{
	struct i2c_adapter *adapter;
	struct v4l2_subdev *sd = NULL;

	if (!s_info || !fmd)
		return NULL;

	adapter = i2c_get_adapter(s_info->pdata.i2c_bus_num);
	if (!adapter) {
		v4l2_warn(&fmd->v4l2_dev,
			  "Failed to get I2C adapter %d, deferring probe\n",
			  s_info->pdata.i2c_bus_num);
		return ERR_PTR(-EPROBE_DEFER);
	}
	sd = v4l2_i2c_new_subdev_board(&fmd->v4l2_dev, adapter,
				       s_info->pdata.board_info, NULL);
	if (IS_ERR_OR_NULL(sd)) {
		i2c_put_adapter(adapter);
		v4l2_warn(&fmd->v4l2_dev,
			  "Failed to acquire subdev %s, deferring probe\n",
			  s_info->pdata.board_info->type);
		return ERR_PTR(-EPROBE_DEFER);
	}
	v4l2_set_subdev_hostdata(sd, s_info);
	sd->grp_id = SENSOR_GROUP_ID;

	v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice %s\n",
		  s_info->pdata.board_info->type);
	return sd;
}

static void fimc_md_unregister_sensor(struct v4l2_subdev *sd)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct i2c_adapter *adapter;

	if (!client)
		return;
	v4l2_device_unregister_subdev(sd);
	adapter = client->adapter;
	i2c_unregister_device(client);
	if (adapter)
		i2c_put_adapter(adapter);
}

static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
{
	struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
	struct fimc_dev *fd = NULL;
	int num_clients, ret, i;

	/*
	 * Runtime resume one of the FIMC entities to make sure
	 * the sclk_cam clocks are not globally disabled.
	 */
	for (i = 0; !fd && i < ARRAY_SIZE(fmd->fimc); i++)
		if (fmd->fimc[i])
			fd = fmd->fimc[i];
	if (!fd)
		return -ENXIO;
	ret = pm_runtime_get_sync(&fd->pdev->dev);
	if (ret < 0)
		return ret;

	WARN_ON(pdata->num_clients > ARRAY_SIZE(fmd->sensor));
	num_clients = min_t(u32, pdata->num_clients, ARRAY_SIZE(fmd->sensor));

	fmd->num_sensors = num_clients;
	for (i = 0; i < num_clients; i++) {
		struct v4l2_subdev *sd;

		fmd->sensor[i].pdata = pdata->isp_info[i];
		ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], true);
		if (ret)
			break;
		sd = fimc_md_register_sensor(fmd, &fmd->sensor[i]);
		ret = __fimc_md_set_camclk(fmd, &fmd->sensor[i], false);

		if (!IS_ERR(sd)) {
			fmd->sensor[i].subdev = sd;
		} else {
			fmd->sensor[i].subdev = NULL;
			ret = PTR_ERR(sd);
			break;
		}
		if (ret)
			break;
	}
	pm_runtime_put(&fd->pdev->dev);
	return ret;
}

/*
 * MIPI CSIS and FIMC platform devices registration.
 */
static int fimc_register_callback(struct device *dev, void *p)
{
	struct fimc_dev *fimc = dev_get_drvdata(dev);
	struct v4l2_subdev *sd;
	struct fimc_md *fmd = p;
	int ret;

	if (fimc == NULL || fimc->id >= FIMC_MAX_DEVS)
		return 0;

	sd = &fimc->vid_cap.subdev;
	sd->grp_id = FIMC_GROUP_ID;
	v4l2_set_subdev_hostdata(sd, (void *)&fimc_pipeline_ops);

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

	fmd->fimc[fimc->id] = fimc;
	return 0;
}

static int fimc_lite_register_callback(struct device *dev, void *p)
{
	struct fimc_lite *fimc = dev_get_drvdata(dev);
	struct fimc_md *fmd = p;
	int ret;

	if (fimc == NULL || fimc->index >= FIMC_LITE_MAX_DEVS)
		return 0;

	fimc->subdev.grp_id = FLITE_GROUP_ID;
	v4l2_set_subdev_hostdata(&fimc->subdev, (void *)&fimc_pipeline_ops);

	ret = v4l2_device_register_subdev(&fmd->v4l2_dev, &fimc->subdev);
	if (ret) {
		v4l2_err(&fmd->v4l2_dev,
			 "Failed to register FIMC-LITE.%d (%d)\n",
			 fimc->index, ret);
		return ret;
	}

	fmd->fimc_lite[fimc->index] = fimc;
	return 0;
}

static int csis_register_callback(struct device *dev, void *p)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct platform_device *pdev;
	struct fimc_md *fmd = p;
	int id, ret;

	if (!sd)
		return 0;
	pdev = v4l2_get_subdevdata(sd);
	if (!pdev || pdev->id < 0 || pdev->id >= CSIS_MAX_ENTITIES)
		return 0;
	v4l2_info(sd, "csis%d sd: %s\n", pdev->id, sd->name);

	id = pdev->id < 0 ? 0 : pdev->id;
	sd->grp_id = CSIS_GROUP_ID;

	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 CSIS subdevice: %d\n", ret);
	return ret;
}

/**
 * fimc_md_register_platform_entities - register FIMC and CSIS media entities
 */
static int fimc_md_register_platform_entities(struct fimc_md *fmd)
{
	struct s5p_platform_fimc *pdata = fmd->pdev->dev.platform_data;
	struct device_driver *driver;
	int ret, i;

	driver = driver_find(FIMC_MODULE_NAME, &platform_bus_type);
	if (!driver) {
		v4l2_warn(&fmd->v4l2_dev,
			 "%s driver not found, deffering probe\n",
			 FIMC_MODULE_NAME);
		return -EPROBE_DEFER;
	}

	ret = driver_for_each_device(driver, NULL, fmd,
				     fimc_register_callback);
	if (ret)
		return ret;

	driver = driver_find(FIMC_LITE_DRV_NAME, &platform_bus_type);
	if (driver && try_module_get(driver->owner)) {
		ret = driver_for_each_device(driver, NULL, fmd,
					     fimc_lite_register_callback);
		if (ret)
			return ret;
		module_put(driver->owner);
	}
	/*
	 * Check if there is any sensor on the MIPI-CSI2 bus and
	 * if not skip the s5p-csis module loading.
	 */
	if (pdata == NULL)
		return 0;
	for (i = 0; i < pdata->num_clients; i++) {
		if (pdata->isp_info[i].bus_type == FIMC_MIPI_CSI2) {
			ret = 1;
			break;
		}
	}
	if (!ret)
		return 0;

	driver = driver_find(CSIS_DRIVER_NAME, &platform_bus_type);
	if (!driver || !try_module_get(driver->owner)) {
		v4l2_warn(&fmd->v4l2_dev,
			 "%s driver not found, deffering probe\n",
			 CSIS_DRIVER_NAME);
		return -EPROBE_DEFER;
	}

	return driver_for_each_device(driver, NULL, fmd,
				      csis_register_callback);
}

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

	for (i = 0; i < FIMC_MAX_DEVS; i++) {
		if (fmd->fimc[i] == NULL)
			continue;
		v4l2_device_unregister_subdev(&fmd->fimc[i]->vid_cap.subdev);
		fmd->fimc[i]->pipeline_ops = NULL;
		fmd->fimc[i] = NULL;
	}
	for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
		if (fmd->fimc_lite[i] == NULL)
			continue;
		v4l2_device_unregister_subdev(&fmd->fimc_lite[i]->subdev);
		fmd->fimc[i]->pipeline_ops = 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);
		module_put(fmd->csis[i].sd->owner);
		fmd->csis[i].sd = NULL;
	}
	for (i = 0; i < fmd->num_sensors; i++) {
		if (fmd->sensor[i].subdev == NULL)
			continue;
		fimc_md_unregister_sensor(fmd->sensor[i].subdev);
		fmd->sensor[i].subdev = NULL;
	}
}

/**
 * __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_sensor_info *s_info;
	struct media_entity *sink;
	unsigned int flags = 0;
	int ret, i;

	for (i = 0; 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_entity_create_link(source, pad, sink,
					      FIMC_SD_PAD_SINK, 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);

		if (flags == 0 || sensor == NULL)
			continue;
		s_info = v4l2_get_subdev_hostdata(sensor);
		if (!WARN_ON(s_info == NULL)) {
			unsigned long irq_flags;
			spin_lock_irqsave(&fmd->slock, irq_flags);
			s_info->host = fmd->fimc[i];
			spin_unlock_irqrestore(&fmd->slock, irq_flags);
		}
	}

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

		if (link_mask & (1 << (i + FIMC_MAX_DEVS)))
			flags = MEDIA_LNK_FL_ENABLED;
		else
			flags = 0;

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

		/* Notify FIMC-LITE 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]",
			  source->name, flags ? '=' : '-', 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;
	unsigned int flags = MEDIA_LNK_FL_ENABLED;
	int i, ret;

	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->vfd.entity;
		/* FIMC-LITE's subdev and video node */
		ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
					       sink, 0, flags);
		if (ret)
			break;
		/* TODO: create links to other entities */
	}

	return ret;
}

/**
 * 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[2] = { NULL };
	struct v4l2_subdev *sensor, *csis;
	struct s5p_fimc_isp_info *pdata;
	struct fimc_sensor_info *s_info;
	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;
		s_info = v4l2_get_subdev_hostdata(sensor);
		if (!s_info)
			continue;

		source = NULL;
		pdata = &s_info->pdata;

		switch (pdata->bus_type) {
		case FIMC_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;

			ret = media_entity_create_link(&sensor->entity, 0,
					      &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]",
				  sensor->entity.name, csis->entity.name);

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

		case FIMC_ITU_601...FIMC_ITU_656:
			source = &sensor->entity;
			pad = 0;
			break;

		default:
			v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
				 pdata->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 < ARRAY_SIZE(fmd->csis); 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.vfd.entity;
		ret = media_entity_create_link(source, FIMC_SD_PAD_SOURCE,
					      sink, 0, flags);
		if (ret)
			break;
	}

	return __fimc_md_create_flite_source_links(fmd);
}

/*
 * The peripheral sensor clock management.
 */
static int fimc_md_get_clocks(struct fimc_md *fmd)
{
	char clk_name[32];
	struct clk *clock;
	int i;

	for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
		snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
		clock = clk_get(NULL, clk_name);
		if (IS_ERR_OR_NULL(clock)) {
			v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s",
				  clk_name);
			return -ENXIO;
		}
		fmd->camclk[i].clock = clock;
	}
	return 0;
}

static void fimc_md_put_clocks(struct fimc_md *fmd)
{
	int i = FIMC_MAX_CAMCLKS;

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

static int __fimc_md_set_camclk(struct fimc_md *fmd,
				struct fimc_sensor_info *s_info,
				bool on)
{
	struct s5p_fimc_isp_info *pdata = &s_info->pdata;
	struct fimc_camclk_info *camclk;
	int ret = 0;

	if (WARN_ON(pdata->clk_id >= FIMC_MAX_CAMCLKS) || fmd == NULL)
		return -EINVAL;

	camclk = &fmd->camclk[pdata->clk_id];

	dbg("camclk %d, f: %lu, use_count: %d, on: %d",
	    pdata->clk_id, pdata->clk_frequency, camclk->use_count, on);

	if (on) {
		if (camclk->use_count > 0 &&
		    camclk->frequency != pdata->clk_frequency)
			return -EINVAL;

		if (camclk->use_count++ == 0) {
			clk_set_rate(camclk->clock, pdata->clk_frequency);
			camclk->frequency = pdata->clk_frequency;
			ret = clk_enable(camclk->clock);
			dbg("Enabled camclk %d: f: %lu", pdata->clk_id,
			    clk_get_rate(camclk->clock));
		}
		return ret;
	}

	if (WARN_ON(camclk->use_count == 0))
		return 0;

	if (--camclk->use_count == 0) {
		clk_disable(camclk->clock);
		dbg("Disabled camclk %d", pdata->clk_id);
	}
	return ret;
}

/**
 * fimc_md_set_camclk - peripheral sensor clock setup
 * @sd: sensor subdev to configure sclk_cam clock for
 * @on: 1 to enable or 0 to disable the clock
 *
 * There are 2 separate clock outputs available in the SoC for external
 * image processors. These clocks are shared between all registered FIMC
 * devices to which sensors can be attached, either directly or through
 * the MIPI CSI receiver. The clock is allowed here to be used by
 * multiple sensors concurrently if they use same frequency.
 * This function should only be called when the graph mutex is held.
 */
int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
{
	struct fimc_sensor_info *s_info = v4l2_get_subdev_hostdata(sd);
	struct fimc_md *fmd = entity_to_fimc_mdev(&sd->entity);

	return __fimc_md_set_camclk(fmd, s_info, on);
}

static int fimc_md_link_notify(struct media_pad *source,
			       struct media_pad *sink, u32 flags)
{
	struct fimc_lite *fimc_lite = NULL;
	struct fimc_dev *fimc = NULL;
	struct fimc_pipeline *pipeline;
	struct v4l2_subdev *sd;
	int ret = 0;

	if (media_entity_type(sink->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
		return 0;

	sd = media_entity_to_v4l2_subdev(sink->entity);

	switch (sd->grp_id) {
	case FLITE_GROUP_ID:
		fimc_lite = v4l2_get_subdevdata(sd);
		pipeline = &fimc_lite->pipeline;
		break;
	case FIMC_GROUP_ID:
		fimc = v4l2_get_subdevdata(sd);
		pipeline = &fimc->pipeline;
		break;
	default:
		return 0;
	}

	if (!(flags & MEDIA_LNK_FL_ENABLED)) {
		ret = __fimc_pipeline_close(pipeline);
		pipeline->subdevs[IDX_SENSOR] = NULL;
		pipeline->subdevs[IDX_CSIS] = NULL;

		if (fimc) {
			mutex_lock(&fimc->lock);
			fimc_ctrls_delete(fimc->vid_cap.ctx);
			mutex_unlock(&fimc->lock);
		}
		return ret;
	}
	/*
	 * Link activation. Enable power of pipeline elements only if the
	 * pipeline is already in use, i.e. its video node is opened.
	 * Recreate the controls destroyed during the link deactivation.
	 */
	if (fimc) {
		mutex_lock(&fimc->lock);
		if (fimc->vid_cap.refcnt > 0) {
			ret = __fimc_pipeline_open(pipeline,
						   source->entity, true);
		if (!ret)
			ret = fimc_capture_ctrls_create(fimc);
		}
		mutex_unlock(&fimc->lock);
	} else {
		mutex_lock(&fimc_lite->lock);
		if (fimc_lite->ref_count > 0) {
			ret = __fimc_pipeline_open(pipeline,
						   source->entity, true);
		}
		mutex_unlock(&fimc_lite->lock);
	}
	return ret ? -EPIPE : ret;
}

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_probe(struct platform_device *pdev)
{
	struct v4l2_device *v4l2_dev;
	struct fimc_md *fmd;
	int ret;

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

	spin_lock_init(&fmd->slock);
	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 = &pdev->dev;

	v4l2_dev = &fmd->v4l2_dev;
	v4l2_dev->mdev = &fmd->media_dev;
	v4l2_dev->notify = fimc_sensor_notify;
	snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s",
		 dev_name(&pdev->dev));

	ret = v4l2_device_register(&pdev->dev, &fmd->v4l2_dev);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
		return ret;
	}
	ret = media_device_register(&fmd->media_dev);
	if (ret < 0) {
		v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
		goto err_md;
	}
	ret = fimc_md_get_clocks(fmd);
	if (ret)
		goto err_clk;

	fmd->user_subdev_api = false;

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

	ret = fimc_md_register_platform_entities(fmd);
	if (ret)
		goto err_unlock;

	if (pdev->dev.platform_data) {
		ret = fimc_md_register_sensor_entities(fmd);
		if (ret)
			goto err_unlock;
	}
	ret = fimc_md_create_links(fmd);
	if (ret)
		goto err_unlock;
	ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
	if (ret)
		goto err_unlock;

	ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
	if (ret)
		goto err_unlock;

	platform_set_drvdata(pdev, fmd);
	mutex_unlock(&fmd->media_dev.graph_mutex);
	return 0;

err_unlock:
	mutex_unlock(&fmd->media_dev.graph_mutex);
err_clk:
	media_device_unregister(&fmd->media_dev);
	fimc_md_put_clocks(fmd);
	fimc_md_unregister_entities(fmd);
err_md:
	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;
	device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
	fimc_md_unregister_entities(fmd);
	media_device_unregister(&fmd->media_dev);
	fimc_md_put_clocks(fmd);
	return 0;
}

static struct platform_driver fimc_md_driver = {
	.probe		= fimc_md_probe,
	.remove		= fimc_md_remove,
	.driver = {
		.name	= "s5p-fimc-md",
		.owner	= THIS_MODULE,
	}
};

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");