summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/ov2680.c
blob: 3ae0ea58668d9fbeeb32b33d8b7452487a9a80e3 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Omnivision OV2680 CMOS Image Sensor driver
 *
 * Copyright (C) 2018 Linaro Ltd
 *
 * Based on OV5640 Sensor Driver
 * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2014-2017 Mentor Graphics Inc.
 *
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#include <media/v4l2-cci.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#define OV2680_CHIP_ID				0x2680

#define OV2680_REG_STREAM_CTRL			CCI_REG8(0x0100)
#define OV2680_REG_SOFT_RESET			CCI_REG8(0x0103)

#define OV2680_REG_CHIP_ID			CCI_REG16(0x300a)
#define OV2680_REG_SC_CMMN_SUB_ID		CCI_REG8(0x302a)
#define OV2680_REG_PLL_MULTIPLIER		CCI_REG16(0x3081)

#define OV2680_REG_EXPOSURE_PK			CCI_REG24(0x3500)
#define OV2680_REG_R_MANUAL			CCI_REG8(0x3503)
#define OV2680_REG_GAIN_PK			CCI_REG16(0x350a)

#define OV2680_REG_SENSOR_CTRL_0A		CCI_REG8(0x370a)

#define OV2680_REG_HORIZONTAL_START		CCI_REG16(0x3800)
#define OV2680_REG_VERTICAL_START		CCI_REG16(0x3802)
#define OV2680_REG_HORIZONTAL_END		CCI_REG16(0x3804)
#define OV2680_REG_VERTICAL_END			CCI_REG16(0x3806)
#define OV2680_REG_HORIZONTAL_OUTPUT_SIZE	CCI_REG16(0x3808)
#define OV2680_REG_VERTICAL_OUTPUT_SIZE		CCI_REG16(0x380a)
#define OV2680_REG_TIMING_HTS			CCI_REG16(0x380c)
#define OV2680_REG_TIMING_VTS			CCI_REG16(0x380e)
#define OV2680_REG_ISP_X_WIN			CCI_REG16(0x3810)
#define OV2680_REG_ISP_Y_WIN			CCI_REG16(0x3812)
#define OV2680_REG_X_INC			CCI_REG8(0x3814)
#define OV2680_REG_Y_INC			CCI_REG8(0x3815)
#define OV2680_REG_FORMAT1			CCI_REG8(0x3820)
#define OV2680_REG_FORMAT2			CCI_REG8(0x3821)

#define OV2680_REG_ISP_CTRL00			CCI_REG8(0x5080)

#define OV2680_REG_X_WIN			CCI_REG16(0x5704)
#define OV2680_REG_Y_WIN			CCI_REG16(0x5706)

#define OV2680_FRAME_RATE			30

#define OV2680_NATIVE_WIDTH			1616
#define OV2680_NATIVE_HEIGHT			1216
#define OV2680_NATIVE_START_LEFT		0
#define OV2680_NATIVE_START_TOP			0
#define OV2680_ACTIVE_WIDTH			1600
#define OV2680_ACTIVE_HEIGHT			1200
#define OV2680_ACTIVE_START_LEFT		8
#define OV2680_ACTIVE_START_TOP			8
#define OV2680_MIN_CROP_WIDTH			2
#define OV2680_MIN_CROP_HEIGHT			2
#define OV2680_MIN_VBLANK			4
#define OV2680_MAX_VBLANK			0xffff

/* Fixed pre-div of 1/2 */
#define OV2680_PLL_PREDIV0			2

/* Pre-div configurable through reg 0x3080, left at its default of 0x02 : 1/2 */
#define OV2680_PLL_PREDIV			2

/* 66MHz pixel clock: 66MHz / 1704 * 1294 = 30fps */
#define OV2680_PIXELS_PER_LINE			1704
#define OV2680_LINES_PER_FRAME_30FPS		1294

/* Max exposure time is VTS - 8 */
#define OV2680_INTEGRATION_TIME_MARGIN		8

#define OV2680_DEFAULT_WIDTH			800
#define OV2680_DEFAULT_HEIGHT			600

/* For enum_frame_size() full-size + binned-/quarter-size */
#define OV2680_FRAME_SIZES			2

static const char * const ov2680_supply_name[] = {
	"DOVDD",
	"DVDD",
	"AVDD",
};

#define OV2680_NUM_SUPPLIES ARRAY_SIZE(ov2680_supply_name)

enum {
	OV2680_19_2_MHZ,
	OV2680_24_MHZ,
};

static const unsigned long ov2680_xvclk_freqs[] = {
	[OV2680_19_2_MHZ] = 19200000,
	[OV2680_24_MHZ] = 24000000,
};

static const u8 ov2680_pll_multipliers[] = {
	[OV2680_19_2_MHZ] = 69,
	[OV2680_24_MHZ] = 55,
};

struct ov2680_ctrls {
	struct v4l2_ctrl_handler handler;
	struct v4l2_ctrl *exposure;
	struct v4l2_ctrl *gain;
	struct v4l2_ctrl *hflip;
	struct v4l2_ctrl *vflip;
	struct v4l2_ctrl *test_pattern;
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;
};

struct ov2680_mode {
	struct v4l2_rect		crop;
	struct v4l2_mbus_framefmt	fmt;
	struct v4l2_fract		frame_interval;
	bool				binning;
	u16				h_start;
	u16				v_start;
	u16				h_end;
	u16				v_end;
	u16				h_output_size;
	u16				v_output_size;
};

struct ov2680_dev {
	struct device			*dev;
	struct regmap			*regmap;
	struct v4l2_subdev		sd;

	struct media_pad		pad;
	struct clk			*xvclk;
	u32				xvclk_freq;
	u8				pll_mult;
	s64				link_freq[1];
	u64				pixel_rate;
	struct regulator_bulk_data	supplies[OV2680_NUM_SUPPLIES];

	struct gpio_desc		*pwdn_gpio;
	struct mutex			lock; /* protect members */

	bool				is_streaming;

	struct ov2680_ctrls		ctrls;
	struct ov2680_mode		mode;
};

static const struct v4l2_rect ov2680_default_crop = {
	.left = OV2680_ACTIVE_START_LEFT,
	.top = OV2680_ACTIVE_START_TOP,
	.width = OV2680_ACTIVE_WIDTH,
	.height = OV2680_ACTIVE_HEIGHT,
};

static const char * const test_pattern_menu[] = {
	"Disabled",
	"Color Bars",
	"Random Data",
	"Square",
	"Black Image",
};

static const int ov2680_hv_flip_bayer_order[] = {
	MEDIA_BUS_FMT_SBGGR10_1X10,
	MEDIA_BUS_FMT_SGRBG10_1X10,
	MEDIA_BUS_FMT_SGBRG10_1X10,
	MEDIA_BUS_FMT_SRGGB10_1X10,
};

static const struct reg_sequence ov2680_global_setting[] = {
	/* MIPI PHY, 0x10 -> 0x1c enable bp_c_hs_en_lat and bp_d_hs_en_lat */
	{0x3016, 0x1c},

	/* R MANUAL set exposure and gain to manual (hw does not do auto) */
	{0x3503, 0x03},

	/* Analog control register tweaks */
	{0x3603, 0x39}, /* Reset value 0x99 */
	{0x3604, 0x24}, /* Reset value 0x74 */
	{0x3621, 0x37}, /* Reset value 0x44 */

	/* Sensor control register tweaks */
	{0x3701, 0x64}, /* Reset value 0x61 */
	{0x3705, 0x3c}, /* Reset value 0x21 */
	{0x370c, 0x50}, /* Reset value 0x10 */
	{0x370d, 0xc0}, /* Reset value 0x00 */
	{0x3718, 0x88}, /* Reset value 0x80 */

	/* PSRAM tweaks */
	{0x3781, 0x80}, /* Reset value 0x00 */
	{0x3784, 0x0c}, /* Reset value 0x00, based on OV2680_R1A_AM10.ovt */
	{0x3789, 0x60}, /* Reset value 0x50 */

	/* BLC CTRL00 0x01 -> 0x81 set avg_weight to 8 */
	{0x4000, 0x81},

	/* Set black level compensation range to 0 - 3 (default 0 - 11) */
	{0x4008, 0x00},
	{0x4009, 0x03},

	/* VFIFO R2 0x00 -> 0x02 set Frame reset enable */
	{0x4602, 0x02},

	/* MIPI ctrl CLK PREPARE MIN change from 0x26 (38) -> 0x36 (54) */
	{0x481f, 0x36},

	/* MIPI ctrl CLK LPX P MIN change from 0x32 (50) -> 0x36 (54) */
	{0x4825, 0x36},

	/* R ISP CTRL2 0x20 -> 0x30, set sof_sel bit */
	{0x5002, 0x30},

	/*
	 * Window CONTROL 0x00 -> 0x01, enable manual window control,
	 * this is necessary for full size flip and mirror support.
	 */
	{0x5708, 0x01},

	/*
	 * DPC CTRL0 0x14 -> 0x3e, set enable_tail, enable_3x3_cluster
	 * and enable_general_tail bits based OV2680_R1A_AM10.ovt.
	 */
	{0x5780, 0x3e},

	/* DPC MORE CONNECTION CASE THRE 0x0c (12) -> 0x02 (2) */
	{0x5788, 0x02},

	/* DPC GAIN LIST1 0x0f (15) -> 0x08 (8) */
	{0x578e, 0x08},

	/* DPC GAIN LIST2 0x3f (63) -> 0x0c (12) */
	{0x578f, 0x0c},

	/* DPC THRE RATIO 0x04 (4) -> 0x00 (0) */
	{0x5792, 0x00},
};

static struct ov2680_dev *to_ov2680_dev(struct v4l2_subdev *sd)
{
	return container_of(sd, struct ov2680_dev, sd);
}

static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
{
	return &container_of(ctrl->handler, struct ov2680_dev,
			     ctrls.handler)->sd;
}

static void ov2680_power_up(struct ov2680_dev *sensor)
{
	if (!sensor->pwdn_gpio)
		return;

	gpiod_set_value(sensor->pwdn_gpio, 0);
	usleep_range(5000, 10000);
}

static void ov2680_power_down(struct ov2680_dev *sensor)
{
	if (!sensor->pwdn_gpio)
		return;

	gpiod_set_value(sensor->pwdn_gpio, 1);
	usleep_range(5000, 10000);
}

static void ov2680_set_bayer_order(struct ov2680_dev *sensor,
				   struct v4l2_mbus_framefmt *fmt)
{
	int hv_flip = 0;

	if (sensor->ctrls.vflip && sensor->ctrls.vflip->val)
		hv_flip += 1;

	if (sensor->ctrls.hflip && sensor->ctrls.hflip->val)
		hv_flip += 2;

	fmt->code = ov2680_hv_flip_bayer_order[hv_flip];
}

static struct v4l2_mbus_framefmt *
__ov2680_get_pad_format(struct ov2680_dev *sensor,
			struct v4l2_subdev_state *state,
			unsigned int pad,
			enum v4l2_subdev_format_whence which)
{
	if (which == V4L2_SUBDEV_FORMAT_TRY)
		return v4l2_subdev_state_get_format(state, pad);

	return &sensor->mode.fmt;
}

static struct v4l2_rect *
__ov2680_get_pad_crop(struct ov2680_dev *sensor,
		      struct v4l2_subdev_state *state,
		      unsigned int pad,
		      enum v4l2_subdev_format_whence which)
{
	if (which == V4L2_SUBDEV_FORMAT_TRY)
		return v4l2_subdev_state_get_crop(state, pad);

	return &sensor->mode.crop;
}

static void ov2680_fill_format(struct ov2680_dev *sensor,
			       struct v4l2_mbus_framefmt *fmt,
			       unsigned int width, unsigned int height)
{
	memset(fmt, 0, sizeof(*fmt));
	fmt->width = width;
	fmt->height = height;
	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	ov2680_set_bayer_order(sensor, fmt);
}

static void ov2680_calc_mode(struct ov2680_dev *sensor)
{
	int width = sensor->mode.fmt.width;
	int height = sensor->mode.fmt.height;
	int orig_width = width;
	int orig_height = height;

	if (width  <= (sensor->mode.crop.width / 2) &&
	    height <= (sensor->mode.crop.height / 2)) {
		sensor->mode.binning = true;
		width *= 2;
		height *= 2;
	} else {
		sensor->mode.binning = false;
	}

	sensor->mode.h_start = (sensor->mode.crop.left +
				(sensor->mode.crop.width - width) / 2) & ~1;
	sensor->mode.v_start = (sensor->mode.crop.top +
				(sensor->mode.crop.height - height) / 2) & ~1;
	sensor->mode.h_end =
		min(sensor->mode.h_start + width - 1, OV2680_NATIVE_WIDTH - 1);
	sensor->mode.v_end =
		min(sensor->mode.v_start + height - 1, OV2680_NATIVE_HEIGHT - 1);
	sensor->mode.h_output_size = orig_width;
	sensor->mode.v_output_size = orig_height;
}

static int ov2680_set_mode(struct ov2680_dev *sensor)
{
	u8 sensor_ctrl_0a, inc, fmt1, fmt2;
	int ret = 0;

	if (sensor->mode.binning) {
		sensor_ctrl_0a = 0x23;
		inc = 0x31;
		fmt1 = 0xc2;
		fmt2 = 0x01;
	} else {
		sensor_ctrl_0a = 0x21;
		inc = 0x11;
		fmt1 = 0xc0;
		fmt2 = 0x00;
	}

	cci_write(sensor->regmap, OV2680_REG_SENSOR_CTRL_0A,
		  sensor_ctrl_0a, &ret);
	cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_START,
		  sensor->mode.h_start, &ret);
	cci_write(sensor->regmap, OV2680_REG_VERTICAL_START,
		  sensor->mode.v_start, &ret);
	cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_END,
		  sensor->mode.h_end, &ret);
	cci_write(sensor->regmap, OV2680_REG_VERTICAL_END,
		  sensor->mode.v_end, &ret);
	cci_write(sensor->regmap, OV2680_REG_HORIZONTAL_OUTPUT_SIZE,
		  sensor->mode.h_output_size, &ret);
	cci_write(sensor->regmap, OV2680_REG_VERTICAL_OUTPUT_SIZE,
		  sensor->mode.v_output_size, &ret);
	cci_write(sensor->regmap, OV2680_REG_TIMING_HTS,
		  OV2680_PIXELS_PER_LINE, &ret);
	/* VTS gets set by the vblank ctrl */
	cci_write(sensor->regmap, OV2680_REG_ISP_X_WIN, 0, &ret);
	cci_write(sensor->regmap, OV2680_REG_ISP_Y_WIN, 0, &ret);
	cci_write(sensor->regmap, OV2680_REG_X_INC, inc, &ret);
	cci_write(sensor->regmap, OV2680_REG_Y_INC, inc, &ret);
	cci_write(sensor->regmap, OV2680_REG_X_WIN,
		  sensor->mode.h_output_size, &ret);
	cci_write(sensor->regmap, OV2680_REG_Y_WIN,
		  sensor->mode.v_output_size, &ret);
	cci_write(sensor->regmap, OV2680_REG_FORMAT1, fmt1, &ret);
	cci_write(sensor->regmap, OV2680_REG_FORMAT2, fmt2, &ret);

	return ret;
}

static int ov2680_set_vflip(struct ov2680_dev *sensor, s32 val)
{
	int ret;

	if (sensor->is_streaming)
		return -EBUSY;

	ret = cci_update_bits(sensor->regmap, OV2680_REG_FORMAT1,
			      BIT(2), val ? BIT(2) : 0, NULL);
	if (ret < 0)
		return ret;

	ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
	return 0;
}

static int ov2680_set_hflip(struct ov2680_dev *sensor, s32 val)
{
	int ret;

	if (sensor->is_streaming)
		return -EBUSY;

	ret = cci_update_bits(sensor->regmap, OV2680_REG_FORMAT2,
			      BIT(2), val ? BIT(2) : 0, NULL);
	if (ret < 0)
		return ret;

	ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
	return 0;
}

static int ov2680_test_pattern_set(struct ov2680_dev *sensor, int value)
{
	int ret = 0;

	if (!value)
		return cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
				       BIT(7), 0, NULL);

	cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
			0x03, value - 1, &ret);
	cci_update_bits(sensor->regmap, OV2680_REG_ISP_CTRL00,
			BIT(7), BIT(7), &ret);

	return ret;
}

static int ov2680_gain_set(struct ov2680_dev *sensor, u32 gain)
{
	return cci_write(sensor->regmap, OV2680_REG_GAIN_PK, gain, NULL);
}

static int ov2680_exposure_set(struct ov2680_dev *sensor, u32 exp)
{
	return cci_write(sensor->regmap, OV2680_REG_EXPOSURE_PK, exp << 4,
			 NULL);
}

static int ov2680_exposure_update_range(struct ov2680_dev *sensor)
{
	int exp_max = sensor->mode.fmt.height + sensor->ctrls.vblank->val -
		      OV2680_INTEGRATION_TIME_MARGIN;

	return __v4l2_ctrl_modify_range(sensor->ctrls.exposure, 0, exp_max,
					1, exp_max);
}

static int ov2680_stream_enable(struct ov2680_dev *sensor)
{
	int ret;

	ret = cci_write(sensor->regmap, OV2680_REG_PLL_MULTIPLIER,
			sensor->pll_mult, NULL);
	if (ret < 0)
		return ret;

	ret = regmap_multi_reg_write(sensor->regmap,
				     ov2680_global_setting,
				     ARRAY_SIZE(ov2680_global_setting));
	if (ret < 0)
		return ret;

	ret = ov2680_set_mode(sensor);
	if (ret < 0)
		return ret;

	/* Restore value of all ctrls */
	ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
	if (ret < 0)
		return ret;

	return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 1, NULL);
}

static int ov2680_stream_disable(struct ov2680_dev *sensor)
{
	return cci_write(sensor->regmap, OV2680_REG_STREAM_CTRL, 0, NULL);
}

static int ov2680_power_off(struct ov2680_dev *sensor)
{
	clk_disable_unprepare(sensor->xvclk);
	ov2680_power_down(sensor);
	regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
	return 0;
}

static int ov2680_power_on(struct ov2680_dev *sensor)
{
	int ret;

	ret = regulator_bulk_enable(OV2680_NUM_SUPPLIES, sensor->supplies);
	if (ret < 0) {
		dev_err(sensor->dev, "failed to enable regulators: %d\n", ret);
		return ret;
	}

	if (!sensor->pwdn_gpio) {
		ret = cci_write(sensor->regmap, OV2680_REG_SOFT_RESET, 0x01,
				NULL);
		if (ret != 0) {
			dev_err(sensor->dev, "sensor soft reset failed\n");
			goto err_disable_regulators;
		}
		usleep_range(1000, 2000);
	} else {
		ov2680_power_down(sensor);
		ov2680_power_up(sensor);
	}

	ret = clk_prepare_enable(sensor->xvclk);
	if (ret < 0)
		goto err_disable_regulators;

	return 0;

err_disable_regulators:
	regulator_bulk_disable(OV2680_NUM_SUPPLIES, sensor->supplies);
	return ret;
}

static int ov2680_get_frame_interval(struct v4l2_subdev *sd,
				     struct v4l2_subdev_state *sd_state,
				     struct v4l2_subdev_frame_interval *fi)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	/*
	 * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
	 * subdev active state API.
	 */
	if (fi->which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	mutex_lock(&sensor->lock);
	fi->interval = sensor->mode.frame_interval;
	mutex_unlock(&sensor->lock);

	return 0;
}

static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	int ret = 0;

	mutex_lock(&sensor->lock);

	if (sensor->is_streaming == !!enable)
		goto unlock;

	if (enable) {
		ret = pm_runtime_resume_and_get(sensor->sd.dev);
		if (ret < 0)
			goto unlock;

		ret = ov2680_stream_enable(sensor);
		if (ret < 0) {
			pm_runtime_put(sensor->sd.dev);
			goto unlock;
		}
	} else {
		ret = ov2680_stream_disable(sensor);
		pm_runtime_put(sensor->sd.dev);
	}

	sensor->is_streaming = !!enable;

unlock:
	mutex_unlock(&sensor->lock);

	return ret;
}

static int ov2680_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	if (code->index != 0)
		return -EINVAL;

	code->code = sensor->mode.fmt.code;

	return 0;
}

static int ov2680_get_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *format)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	struct v4l2_mbus_framefmt *fmt;

	fmt = __ov2680_get_pad_format(sensor, sd_state, format->pad,
				      format->which);

	mutex_lock(&sensor->lock);
	format->format = *fmt;
	mutex_unlock(&sensor->lock);

	return 0;
}

static int ov2680_set_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *format)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	struct v4l2_mbus_framefmt *try_fmt;
	const struct v4l2_rect *crop;
	unsigned int width, height;
	int def, max, ret = 0;

	crop = __ov2680_get_pad_crop(sensor, sd_state, format->pad,
				     format->which);

	/* Limit set_fmt max size to crop width / height */
	width = clamp_val(ALIGN(format->format.width, 2),
			  OV2680_MIN_CROP_WIDTH, crop->width);
	height = clamp_val(ALIGN(format->format.height, 2),
			   OV2680_MIN_CROP_HEIGHT, crop->height);

	ov2680_fill_format(sensor, &format->format, width, height);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
		try_fmt = v4l2_subdev_state_get_format(sd_state, 0);
		*try_fmt = format->format;
		return 0;
	}

	mutex_lock(&sensor->lock);

	if (sensor->is_streaming) {
		ret = -EBUSY;
		goto unlock;
	}

	sensor->mode.fmt = format->format;
	ov2680_calc_mode(sensor);

	/* vblank range is height dependent adjust and reset to default */
	max = OV2680_MAX_VBLANK - height;
	def = OV2680_LINES_PER_FRAME_30FPS - height;
	ret = __v4l2_ctrl_modify_range(sensor->ctrls.vblank, OV2680_MIN_VBLANK,
				       max, 1, def);
	if (ret)
		goto unlock;

	ret = __v4l2_ctrl_s_ctrl(sensor->ctrls.vblank, def);
	if (ret)
		goto unlock;

	/* exposure range depends on vts which may have changed */
	ret = ov2680_exposure_update_range(sensor);
	if (ret)
		goto unlock;

	/* adjust hblank value for new width */
	def = OV2680_PIXELS_PER_LINE - width;
	ret = __v4l2_ctrl_modify_range(sensor->ctrls.hblank, def, def, 1, def);

unlock:
	mutex_unlock(&sensor->lock);

	return ret;
}

static int ov2680_get_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				struct v4l2_subdev_selection *sel)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP:
		mutex_lock(&sensor->lock);
		sel->r = *__ov2680_get_pad_crop(sensor, state, sel->pad,
						sel->which);
		mutex_unlock(&sensor->lock);
		break;
	case V4L2_SEL_TGT_NATIVE_SIZE:
	case V4L2_SEL_TGT_CROP_BOUNDS:
		sel->r.top = 0;
		sel->r.left = 0;
		sel->r.width = OV2680_NATIVE_WIDTH;
		sel->r.height = OV2680_NATIVE_HEIGHT;
		break;
	case V4L2_SEL_TGT_CROP_DEFAULT:
		sel->r = ov2680_default_crop;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ov2680_set_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				struct v4l2_subdev_selection *sel)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	struct v4l2_mbus_framefmt *format;
	struct v4l2_rect *crop;
	struct v4l2_rect rect;

	if (sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;

	/*
	 * Clamp the boundaries of the crop rectangle to the size of the sensor
	 * pixel array. Align to multiples of 2 to ensure Bayer pattern isn't
	 * disrupted.
	 */
	rect.left = clamp_val(ALIGN(sel->r.left, 2),
			      OV2680_NATIVE_START_LEFT, OV2680_NATIVE_WIDTH);
	rect.top = clamp_val(ALIGN(sel->r.top, 2),
			     OV2680_NATIVE_START_TOP, OV2680_NATIVE_HEIGHT);
	rect.width = clamp_val(ALIGN(sel->r.width, 2),
			       OV2680_MIN_CROP_WIDTH, OV2680_NATIVE_WIDTH);
	rect.height = clamp_val(ALIGN(sel->r.height, 2),
				OV2680_MIN_CROP_HEIGHT, OV2680_NATIVE_HEIGHT);

	/* Make sure the crop rectangle isn't outside the bounds of the array */
	rect.width = min_t(unsigned int, rect.width,
			   OV2680_NATIVE_WIDTH - rect.left);
	rect.height = min_t(unsigned int, rect.height,
			    OV2680_NATIVE_HEIGHT - rect.top);

	crop = __ov2680_get_pad_crop(sensor, state, sel->pad, sel->which);

	mutex_lock(&sensor->lock);
	if (rect.width != crop->width || rect.height != crop->height) {
		/*
		 * Reset the output image size if the crop rectangle size has
		 * been modified.
		 */
		format = __ov2680_get_pad_format(sensor, state, sel->pad,
						 sel->which);
		format->width = rect.width;
		format->height = rect.height;
	}

	*crop = rect;
	mutex_unlock(&sensor->lock);

	sel->r = rect;

	return 0;
}

static int ov2680_init_state(struct v4l2_subdev *sd,
			     struct v4l2_subdev_state *sd_state)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	*v4l2_subdev_state_get_crop(sd_state, 0) = ov2680_default_crop;

	ov2680_fill_format(sensor, v4l2_subdev_state_get_format(sd_state, 0),
			   OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
	return 0;
}

static int ov2680_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	struct v4l2_rect *crop;

	if (fse->index >= OV2680_FRAME_SIZES)
		return -EINVAL;

	crop = __ov2680_get_pad_crop(sensor, sd_state, fse->pad, fse->which);
	if (!crop)
		return -EINVAL;

	fse->min_width = crop->width / (fse->index + 1);
	fse->min_height = crop->height / (fse->index + 1);
	fse->max_width = fse->min_width;
	fse->max_height = fse->min_height;

	return 0;
}

static bool ov2680_valid_frame_size(struct v4l2_subdev *sd,
				    struct v4l2_subdev_state *sd_state,
				    struct v4l2_subdev_frame_interval_enum *fie)
{
	struct v4l2_subdev_frame_size_enum fse = {
		.pad = fie->pad,
		.which = fie->which,
	};
	int i;

	for (i = 0; i < OV2680_FRAME_SIZES; i++) {
		fse.index = i;

		if (ov2680_enum_frame_size(sd, sd_state, &fse))
			return false;

		if (fie->width == fse.min_width &&
		    fie->height == fse.min_height)
			return true;
	}

	return false;
}

static int ov2680_enum_frame_interval(struct v4l2_subdev *sd,
			      struct v4l2_subdev_state *sd_state,
			      struct v4l2_subdev_frame_interval_enum *fie)
{
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	/* Only 1 framerate */
	if (fie->index || !ov2680_valid_frame_size(sd, sd_state, fie))
		return -EINVAL;

	fie->interval = sensor->mode.frame_interval;

	return 0;
}

static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	int ret;

	/* Update exposure range on vblank changes */
	if (ctrl->id == V4L2_CID_VBLANK) {
		ret = ov2680_exposure_update_range(sensor);
		if (ret)
			return ret;
	}

	/* Only apply changes to the controls if the device is powered up */
	if (!pm_runtime_get_if_in_use(sensor->sd.dev)) {
		ov2680_set_bayer_order(sensor, &sensor->mode.fmt);
		return 0;
	}

	switch (ctrl->id) {
	case V4L2_CID_ANALOGUE_GAIN:
		ret = ov2680_gain_set(sensor, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE:
		ret = ov2680_exposure_set(sensor, ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ret = ov2680_set_vflip(sensor, ctrl->val);
		break;
	case V4L2_CID_HFLIP:
		ret = ov2680_set_hflip(sensor, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = ov2680_test_pattern_set(sensor, ctrl->val);
		break;
	case V4L2_CID_VBLANK:
		ret = cci_write(sensor->regmap, OV2680_REG_TIMING_VTS,
				sensor->mode.fmt.height + ctrl->val, NULL);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	pm_runtime_put(sensor->sd.dev);
	return ret;
}

static const struct v4l2_ctrl_ops ov2680_ctrl_ops = {
	.s_ctrl = ov2680_s_ctrl,
};

static const struct v4l2_subdev_video_ops ov2680_video_ops = {
	.s_stream		= ov2680_s_stream,
};

static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
	.enum_mbus_code		= ov2680_enum_mbus_code,
	.enum_frame_size	= ov2680_enum_frame_size,
	.enum_frame_interval	= ov2680_enum_frame_interval,
	.get_fmt		= ov2680_get_fmt,
	.set_fmt		= ov2680_set_fmt,
	.get_selection		= ov2680_get_selection,
	.set_selection		= ov2680_set_selection,
	.get_frame_interval	= ov2680_get_frame_interval,
	.set_frame_interval	= ov2680_get_frame_interval,
};

static const struct v4l2_subdev_ops ov2680_subdev_ops = {
	.video	= &ov2680_video_ops,
	.pad	= &ov2680_pad_ops,
};

static const struct v4l2_subdev_internal_ops ov2680_internal_ops = {
	.init_state		= ov2680_init_state,
};

static int ov2680_mode_init(struct ov2680_dev *sensor)
{
	/* set initial mode */
	sensor->mode.crop = ov2680_default_crop;
	ov2680_fill_format(sensor, &sensor->mode.fmt,
			   OV2680_DEFAULT_WIDTH, OV2680_DEFAULT_HEIGHT);
	ov2680_calc_mode(sensor);

	sensor->mode.frame_interval.denominator = OV2680_FRAME_RATE;
	sensor->mode.frame_interval.numerator = 1;

	return 0;
}

static int ov2680_v4l2_register(struct ov2680_dev *sensor)
{
	struct i2c_client *client = to_i2c_client(sensor->dev);
	const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
	struct ov2680_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
	struct v4l2_fwnode_device_properties props;
	int def, max, ret = 0;

	v4l2_i2c_subdev_init(&sensor->sd, client, &ov2680_subdev_ops);
	sensor->sd.internal_ops = &ov2680_internal_ops;

	sensor->sd.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
	sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
	if (ret < 0)
		return ret;

	v4l2_ctrl_handler_init(hdl, 5);

	hdl->lock = &sensor->lock;

	ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
	ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);

	ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(hdl,
					&ov2680_ctrl_ops, V4L2_CID_TEST_PATTERN,
					ARRAY_SIZE(test_pattern_menu) - 1,
					0, 0, test_pattern_menu);

	max = OV2680_LINES_PER_FRAME_30FPS - OV2680_INTEGRATION_TIME_MARGIN;
	ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
					    0, max, 1, max);

	ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
					0, 1023, 1, 250);

	ctrls->link_freq = v4l2_ctrl_new_int_menu(hdl, NULL, V4L2_CID_LINK_FREQ,
						  0, 0, sensor->link_freq);
	ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, NULL, V4L2_CID_PIXEL_RATE,
					      0, sensor->pixel_rate,
					      1, sensor->pixel_rate);

	max = OV2680_MAX_VBLANK - OV2680_DEFAULT_HEIGHT;
	def = OV2680_LINES_PER_FRAME_30FPS - OV2680_DEFAULT_HEIGHT;
	ctrls->vblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VBLANK,
					  OV2680_MIN_VBLANK, max, 1, def);

	def = OV2680_PIXELS_PER_LINE - OV2680_DEFAULT_WIDTH;
	ctrls->hblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HBLANK,
					  def, def, 1, def);

	ret = v4l2_fwnode_device_parse(sensor->dev, &props);
	if (ret)
		goto cleanup_entity;

	v4l2_ctrl_new_fwnode_properties(hdl, ops, &props);

	if (hdl->error) {
		ret = hdl->error;
		goto cleanup_entity;
	}

	ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
	ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
	ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
	ctrls->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	sensor->sd.ctrl_handler = hdl;

	ret = v4l2_async_register_subdev(&sensor->sd);
	if (ret < 0)
		goto cleanup_entity;

	return 0;

cleanup_entity:
	media_entity_cleanup(&sensor->sd.entity);
	v4l2_ctrl_handler_free(hdl);

	return ret;
}

static int ov2680_get_regulators(struct ov2680_dev *sensor)
{
	int i;

	for (i = 0; i < OV2680_NUM_SUPPLIES; i++)
		sensor->supplies[i].supply = ov2680_supply_name[i];

	return devm_regulator_bulk_get(sensor->dev,
				       OV2680_NUM_SUPPLIES, sensor->supplies);
}

static int ov2680_check_id(struct ov2680_dev *sensor)
{
	u64 chip_id, rev;
	int ret = 0;

	cci_read(sensor->regmap, OV2680_REG_CHIP_ID, &chip_id, &ret);
	cci_read(sensor->regmap, OV2680_REG_SC_CMMN_SUB_ID, &rev, &ret);
	if (ret < 0) {
		dev_err(sensor->dev, "failed to read chip id\n");
		return ret;
	}

	if (chip_id != OV2680_CHIP_ID) {
		dev_err(sensor->dev, "chip id: 0x%04llx does not match expected 0x%04x\n",
			chip_id, OV2680_CHIP_ID);
		return -ENODEV;
	}

	dev_info(sensor->dev, "sensor_revision id = 0x%llx, rev= %lld\n",
		 chip_id, rev & 0x0f);

	return 0;
}

static int ov2680_parse_dt(struct ov2680_dev *sensor)
{
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY,
	};
	struct device *dev = sensor->dev;
	struct fwnode_handle *ep_fwnode;
	struct gpio_desc *gpio;
	unsigned int rate = 0;
	int i, ret;

	/*
	 * Sometimes the fwnode graph is initialized by the bridge driver.
	 * Bridge drivers doing this may also add GPIO mappings, wait for this.
	 */
	ep_fwnode = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
	if (!ep_fwnode)
		return dev_err_probe(dev, -EPROBE_DEFER,
				     "waiting for fwnode graph endpoint\n");

	ret = v4l2_fwnode_endpoint_alloc_parse(ep_fwnode, &bus_cfg);
	fwnode_handle_put(ep_fwnode);
	if (ret)
		return ret;

	/*
	 * The pin we want is named XSHUTDN in the datasheet. Linux sensor
	 * drivers have standardized on using "powerdown" as con-id name
	 * for powerdown or shutdown pins. Older DTB files use "reset",
	 * so fallback to that if there is no "powerdown" pin.
	 */
	gpio = devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH);
	if (!gpio)
		gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);

	ret = PTR_ERR_OR_ZERO(gpio);
	if (ret < 0) {
		dev_dbg(dev, "error while getting reset gpio: %d\n", ret);
		goto out_free_bus_cfg;
	}

	sensor->pwdn_gpio = gpio;

	sensor->xvclk = devm_clk_get_optional(dev, "xvclk");
	if (IS_ERR(sensor->xvclk)) {
		ret = dev_err_probe(dev, PTR_ERR(sensor->xvclk),
				    "xvclk clock missing or invalid\n");
		goto out_free_bus_cfg;
	}

	/*
	 * We could have either a 24MHz or 19.2MHz clock rate from either DT or
	 * ACPI... but we also need to support the weird IPU3 case which will
	 * have an external clock AND a clock-frequency property. Check for the
	 * clock-frequency property and if found, set that rate if we managed
	 * to acquire a clock. This should cover the ACPI case. If the system
	 * uses devicetree then the configured rate should already be set, so
	 * we can just read it.
	 */
	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
				       &rate);
	if (ret && !sensor->xvclk) {
		dev_err_probe(dev, ret, "invalid clock config\n");
		goto out_free_bus_cfg;
	}

	if (!ret && sensor->xvclk) {
		ret = clk_set_rate(sensor->xvclk, rate);
		if (ret) {
			dev_err_probe(dev, ret, "failed to set clock rate\n");
			goto out_free_bus_cfg;
		}
	}

	sensor->xvclk_freq = rate ?: clk_get_rate(sensor->xvclk);

	for (i = 0; i < ARRAY_SIZE(ov2680_xvclk_freqs); i++) {
		if (sensor->xvclk_freq == ov2680_xvclk_freqs[i])
			break;
	}

	if (i == ARRAY_SIZE(ov2680_xvclk_freqs)) {
		ret = dev_err_probe(dev, -EINVAL,
				    "unsupported xvclk frequency %d Hz\n",
				    sensor->xvclk_freq);
		goto out_free_bus_cfg;
	}

	sensor->pll_mult = ov2680_pll_multipliers[i];

	sensor->link_freq[0] = sensor->xvclk_freq / OV2680_PLL_PREDIV0 /
			       OV2680_PLL_PREDIV * sensor->pll_mult;

	/* CSI-2 is double data rate, bus-format is 10 bpp */
	sensor->pixel_rate = sensor->link_freq[0] * 2;
	do_div(sensor->pixel_rate, 10);

	if (!bus_cfg.nr_of_link_frequencies) {
		dev_warn(dev, "Consider passing 'link-frequencies' in DT\n");
		goto skip_link_freq_validation;
	}

	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
		if (bus_cfg.link_frequencies[i] == sensor->link_freq[0])
			break;

	if (bus_cfg.nr_of_link_frequencies == i) {
		ret = dev_err_probe(dev, -EINVAL,
				    "supported link freq %lld not found\n",
				    sensor->link_freq[0]);
		goto out_free_bus_cfg;
	}

skip_link_freq_validation:
	ret = 0;
out_free_bus_cfg:
	v4l2_fwnode_endpoint_free(&bus_cfg);
	return ret;
}

static int ov2680_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct ov2680_dev *sensor;
	int ret;

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

	sensor->dev = &client->dev;

	sensor->regmap = devm_cci_regmap_init_i2c(client, 16);
	if (IS_ERR(sensor->regmap))
		return PTR_ERR(sensor->regmap);

	ret = ov2680_parse_dt(sensor);
	if (ret < 0)
		return ret;

	ret = ov2680_mode_init(sensor);
	if (ret < 0)
		return ret;

	ret = ov2680_get_regulators(sensor);
	if (ret < 0) {
		dev_err(dev, "failed to get regulators\n");
		return ret;
	}

	mutex_init(&sensor->lock);

	/*
	 * Power up and verify the chip now, so that if runtime pm is
	 * disabled the chip is left on and streaming will work.
	 */
	ret = ov2680_power_on(sensor);
	if (ret < 0)
		goto lock_destroy;

	ret = ov2680_check_id(sensor);
	if (ret < 0)
		goto err_powerdown;

	pm_runtime_set_active(&client->dev);
	pm_runtime_get_noresume(&client->dev);
	pm_runtime_enable(&client->dev);

	ret = ov2680_v4l2_register(sensor);
	if (ret < 0)
		goto err_pm_runtime;

	pm_runtime_set_autosuspend_delay(&client->dev, 1000);
	pm_runtime_use_autosuspend(&client->dev);
	pm_runtime_put_autosuspend(&client->dev);

	return 0;

err_pm_runtime:
	pm_runtime_disable(&client->dev);
	pm_runtime_put_noidle(&client->dev);
err_powerdown:
	ov2680_power_off(sensor);
lock_destroy:
	dev_err(dev, "ov2680 init fail: %d\n", ret);
	mutex_destroy(&sensor->lock);

	return ret;
}

static void ov2680_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	v4l2_async_unregister_subdev(&sensor->sd);
	mutex_destroy(&sensor->lock);
	media_entity_cleanup(&sensor->sd.entity);
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);

	/*
	 * Disable runtime PM. In case runtime PM is disabled in the kernel,
	 * make sure to turn power off manually.
	 */
	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		ov2680_power_off(sensor);
	pm_runtime_set_suspended(&client->dev);
}

static int ov2680_suspend(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2680_dev *sensor = to_ov2680_dev(sd);

	if (sensor->is_streaming)
		ov2680_stream_disable(sensor);

	return ov2680_power_off(sensor);
}

static int ov2680_resume(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov2680_dev *sensor = to_ov2680_dev(sd);
	int ret;

	ret = ov2680_power_on(sensor);
	if (ret < 0)
		goto stream_disable;

	if (sensor->is_streaming) {
		ret = ov2680_stream_enable(sensor);
		if (ret < 0)
			goto stream_disable;
	}

	return 0;

stream_disable:
	ov2680_stream_disable(sensor);
	sensor->is_streaming = false;

	return ret;
}

static DEFINE_RUNTIME_DEV_PM_OPS(ov2680_pm_ops, ov2680_suspend, ov2680_resume,
				 NULL);

static const struct of_device_id ov2680_dt_ids[] = {
	{ .compatible = "ovti,ov2680" },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ov2680_dt_ids);

static const struct acpi_device_id ov2680_acpi_ids[] = {
	{ "OVTI2680" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(acpi, ov2680_acpi_ids);

static struct i2c_driver ov2680_i2c_driver = {
	.driver = {
		.name  = "ov2680",
		.pm = pm_sleep_ptr(&ov2680_pm_ops),
		.of_match_table	= ov2680_dt_ids,
		.acpi_match_table = ov2680_acpi_ids,
	},
	.probe		= ov2680_probe,
	.remove		= ov2680_remove,
};
module_i2c_driver(ov2680_i2c_driver);

MODULE_AUTHOR("Rui Miguel Silva <rui.silva@linaro.org>");
MODULE_DESCRIPTION("OV2680 CMOS Image Sensor driver");
MODULE_LICENSE("GPL v2");