aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/ov7740.c
blob: 0308ba437bbbc7f9f8a50380766eea2029ec5488 (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
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017 Microchip Corporation.

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-image-sizes.h>
#include <media/v4l2-subdev.h>

#define REG_OUTSIZE_LSB 0x34

/* OV7740 register tables */
#define REG_GAIN	0x00	/* Gain lower 8 bits (rest in vref) */
#define REG_BGAIN	0x01	/* blue gain */
#define REG_RGAIN	0x02	/* red gain */
#define REG_GGAIN	0x03	/* green gain */
#define REG_REG04	0x04	/* analog setting, dont change*/
#define REG_BAVG	0x05	/* b channel average */
#define REG_GAVG	0x06	/* g channel average */
#define REG_RAVG	0x07	/* r channel average */

#define REG_REG0C	0x0C	/* filp enable */
#define REG0C_IMG_FLIP		0x80
#define REG0C_IMG_MIRROR	0x40

#define REG_REG0E	0x0E	/* blc line */
#define REG_HAEC	0x0F	/* auto exposure cntrl */
#define REG_AEC		0x10	/* auto exposure cntrl */

#define REG_CLK		0x11	/* Clock control */
#define REG_REG55	0x55	/* Clock PLL DIV/PreDiv */

#define REG_REG12	0x12

#define REG_REG13	0x13	/* auto/manual AGC, AEC, Write Balance*/
#define REG13_AEC_EN	0x01
#define REG13_AGC_EN	0x04

#define REG_REG14	0x14
#define REG_CTRL15	0x15
#define REG15_GAIN_MSB	0x03

#define REG_REG16	0x16

#define REG_MIDH	0x1C	/* manufacture id byte */
#define REG_MIDL	0x1D	/* manufacture id byre */
#define REG_PIDH	0x0A	/* Product ID MSB */
#define REG_PIDL	0x0B	/* Product ID LSB */

#define REG_84		0x84	/* lots of stuff */
#define REG_REG38	0x38	/* sub-addr */

#define REG_AHSTART	0x17	/* Horiz start high bits */
#define REG_AHSIZE	0x18
#define REG_AVSTART	0x19	/* Vert start high bits */
#define REG_AVSIZE	0x1A
#define REG_PSHFT	0x1b	/* Pixel delay after HREF */

#define REG_HOUTSIZE	0x31
#define REG_VOUTSIZE	0x32
#define REG_HVSIZEOFF	0x33
#define REG_REG34	0x34	/* DSP output size H/V LSB*/

#define REG_ISP_CTRL00	0x80
#define ISPCTRL00_AWB_EN	0x10
#define ISPCTRL00_AWB_GAIN_EN	0x04

#define	REG_YGAIN	0xE2	/* ygain for contrast control */

#define	REG_YBRIGHT	  0xE3
#define	REG_SGNSET	  0xE4
#define	SGNSET_YBRIGHT_MASK	  0x08

#define REG_USAT	0xDD
#define REG_VSAT	0xDE


struct ov7740 {
	struct v4l2_subdev subdev;
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_pad pad;
#endif
	struct v4l2_mbus_framefmt format;
	const struct ov7740_pixfmt *fmt;  /* Current format */
	const struct ov7740_framesize *frmsize;
	struct regmap *regmap;
	struct clk *xvclk;
	struct v4l2_ctrl_handler ctrl_handler;
	struct {
		/* gain cluster */
		struct v4l2_ctrl *auto_gain;
		struct v4l2_ctrl *gain;
	};
	struct {
		struct v4l2_ctrl *auto_wb;
		struct v4l2_ctrl *blue_balance;
		struct v4l2_ctrl *red_balance;
	};
	struct {
		struct v4l2_ctrl *hflip;
		struct v4l2_ctrl *vflip;
	};
	struct {
		/* exposure cluster */
		struct v4l2_ctrl *auto_exposure;
		struct v4l2_ctrl *exposure;
	};
	struct {
		/* saturation/hue cluster */
		struct v4l2_ctrl *saturation;
		struct v4l2_ctrl *hue;
	};
	struct v4l2_ctrl *brightness;
	struct v4l2_ctrl *contrast;

	struct mutex mutex;	/* To serialize asynchronus callbacks */
	bool streaming;		/* Streaming on/off */

	struct gpio_desc *resetb_gpio;
	struct gpio_desc *pwdn_gpio;
};

struct ov7740_pixfmt {
	u32 mbus_code;
	enum v4l2_colorspace colorspace;
	const struct reg_sequence *regs;
	u32 reg_num;
};

struct ov7740_framesize {
	u16 width;
	u16 height;
	const struct reg_sequence *regs;
	u32 reg_num;
};

static const struct reg_sequence ov7740_vga[] = {
	{0x55, 0x40},
	{0x11, 0x02},

	{0xd5, 0x10},
	{0x0c, 0x12},
	{0x0d, 0x34},
	{0x17, 0x25},
	{0x18, 0xa0},
	{0x19, 0x03},
	{0x1a, 0xf0},
	{0x1b, 0x89},
	{0x22, 0x03},
	{0x29, 0x18},
	{0x2b, 0xf8},
	{0x2c, 0x01},
	{REG_HOUTSIZE, 0xa0},
	{REG_VOUTSIZE, 0xf0},
	{0x33, 0xc4},
	{REG_OUTSIZE_LSB, 0x0},
	{0x35, 0x05},
	{0x04, 0x60},
	{0x27, 0x80},
	{0x3d, 0x0f},
	{0x3e, 0x80},
	{0x3f, 0x40},
	{0x40, 0x7f},
	{0x41, 0x6a},
	{0x42, 0x29},
	{0x44, 0x22},
	{0x45, 0x41},
	{0x47, 0x02},
	{0x49, 0x64},
	{0x4a, 0xa1},
	{0x4b, 0x40},
	{0x4c, 0x1a},
	{0x4d, 0x50},
	{0x4e, 0x13},
	{0x64, 0x00},
	{0x67, 0x88},
	{0x68, 0x1a},

	{0x14, 0x28},
	{0x24, 0x3c},
	{0x25, 0x30},
	{0x26, 0x72},
	{0x50, 0x97},
	{0x51, 0x1f},
	{0x52, 0x00},
	{0x53, 0x00},
	{0x20, 0x00},
	{0x21, 0xcf},
	{0x50, 0x4b},
	{0x38, 0x14},
	{0xe9, 0x00},
	{0x56, 0x55},
	{0x57, 0xff},
	{0x58, 0xff},
	{0x59, 0xff},
	{0x5f, 0x04},
	{0xec, 0x00},
	{0x13, 0xff},

	{0x81, 0x3f},
	{0x82, 0x32},
	{0x38, 0x11},
	{0x84, 0x70},
	{0x85, 0x00},
	{0x86, 0x03},
	{0x87, 0x01},
	{0x88, 0x05},
	{0x89, 0x30},
	{0x8d, 0x30},
	{0x8f, 0x85},
	{0x93, 0x30},
	{0x95, 0x85},
	{0x99, 0x30},
	{0x9b, 0x85},

	{0x9c, 0x08},
	{0x9d, 0x12},
	{0x9e, 0x23},
	{0x9f, 0x45},
	{0xa0, 0x55},
	{0xa1, 0x64},
	{0xa2, 0x72},
	{0xa3, 0x7f},
	{0xa4, 0x8b},
	{0xa5, 0x95},
	{0xa6, 0xa7},
	{0xa7, 0xb5},
	{0xa8, 0xcb},
	{0xa9, 0xdd},
	{0xaa, 0xec},
	{0xab, 0x1a},

	{0xce, 0x78},
	{0xcf, 0x6e},
	{0xd0, 0x0a},
	{0xd1, 0x0c},
	{0xd2, 0x84},
	{0xd3, 0x90},
	{0xd4, 0x1e},

	{0x5a, 0x24},
	{0x5b, 0x1f},
	{0x5c, 0x88},
	{0x5d, 0x60},

	{0xac, 0x6e},
	{0xbe, 0xff},
	{0xbf, 0x00},

	{0x0f, 0x1d},
	{0x0f, 0x1f},
};

static const struct ov7740_framesize ov7740_framesizes[] = {
	{
		.width		= VGA_WIDTH,
		.height		= VGA_HEIGHT,
		.regs		= ov7740_vga,
		.reg_num	= ARRAY_SIZE(ov7740_vga),
	},
};

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int ov7740_get_register(struct v4l2_subdev *sd,
			       struct v4l2_dbg_register *reg)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	struct regmap *regmap = ov7740->regmap;
	unsigned int val = 0;
	int ret;

	ret = regmap_read(regmap, reg->reg & 0xff, &val);
	reg->val = val;
	reg->size = 1;

	return 0;
}

static int ov7740_set_register(struct v4l2_subdev *sd,
			       const struct v4l2_dbg_register *reg)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	struct regmap *regmap = ov7740->regmap;

	regmap_write(regmap, reg->reg & 0xff, reg->val & 0xff);

	return 0;
}
#endif

static int ov7740_set_power(struct ov7740 *ov7740, int on)
{
	int ret;

	if (on) {
		ret = clk_prepare_enable(ov7740->xvclk);
		if (ret)
			return ret;

		if (ov7740->pwdn_gpio)
			gpiod_direction_output(ov7740->pwdn_gpio, 0);

		if (ov7740->resetb_gpio) {
			gpiod_set_value(ov7740->resetb_gpio, 1);
			usleep_range(500, 1000);
			gpiod_set_value(ov7740->resetb_gpio, 0);
			usleep_range(3000, 5000);
		}
	} else {
		clk_disable_unprepare(ov7740->xvclk);

		if (ov7740->pwdn_gpio)
			gpiod_direction_output(ov7740->pwdn_gpio, 0);
	}

	return 0;
}

static struct v4l2_subdev_core_ops ov7740_subdev_core_ops = {
	.log_status = v4l2_ctrl_subdev_log_status,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register = ov7740_get_register,
	.s_register = ov7740_set_register,
#endif
	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static int ov7740_set_white_balance(struct ov7740 *ov7740, int awb)
{
	struct regmap *regmap = ov7740->regmap;
	unsigned int value;
	int ret;

	ret = regmap_read(regmap, REG_ISP_CTRL00, &value);
	if (!ret) {
		if (awb)
			value |= (ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
		else
			value &= ~(ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
		ret = regmap_write(regmap, REG_ISP_CTRL00, value);
		if (ret)
			return ret;
	}

	if (!awb) {
		ret = regmap_write(regmap, REG_BGAIN,
				   ov7740->blue_balance->val);
		if (ret)
			return ret;

		ret = regmap_write(regmap, REG_RGAIN, ov7740->red_balance->val);
		if (ret)
			return ret;
	}

	return 0;
}

static int ov7740_set_saturation(struct regmap *regmap, int value)
{
	int ret;

	ret = regmap_write(regmap, REG_USAT, (unsigned char)value);
	if (ret)
		return ret;

	return regmap_write(regmap, REG_VSAT, (unsigned char)value);
}

static int ov7740_set_gain(struct regmap *regmap, int value)
{
	int ret;

	ret = regmap_write(regmap, REG_GAIN, value & 0xff);
	if (ret)
		return ret;

	ret = regmap_update_bits(regmap, REG_CTRL15,
				 REG15_GAIN_MSB, (value >> 8) & 0x3);
	if (!ret)
		ret = regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);

	return ret;
}

static int ov7740_set_autogain(struct regmap *regmap, int value)
{
	unsigned int reg;
	int ret;

	ret = regmap_read(regmap, REG_REG13, &reg);
	if (ret)
		return ret;
	if (value)
		reg |= REG13_AGC_EN;
	else
		reg &= ~REG13_AGC_EN;
	return regmap_write(regmap, REG_REG13, reg);
}

static int ov7740_set_brightness(struct regmap *regmap, int value)
{
	/* Turn off AEC/AGC */
	regmap_update_bits(regmap, REG_REG13, REG13_AEC_EN, 0);
	regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);

	if (value >= 0) {
		regmap_write(regmap, REG_YBRIGHT, (unsigned char)value);
		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 0);
	} else{
		regmap_write(regmap, REG_YBRIGHT, (unsigned char)(-value));
		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 1);
	}

	return 0;
}

static int ov7740_set_contrast(struct regmap *regmap, int value)
{
	return regmap_write(regmap, REG_YGAIN, (unsigned char)value);
}

static int ov7740_get_gain(struct ov7740 *ov7740, struct v4l2_ctrl *ctrl)
{
	struct regmap *regmap = ov7740->regmap;
	unsigned int value0, value1;
	int ret;

	if (!ctrl->val)
		return 0;

	ret = regmap_read(regmap, REG_GAIN, &value0);
	if (ret)
		return ret;
	ret = regmap_read(regmap, REG_CTRL15, &value1);
	if (ret)
		return ret;

	ov7740->gain->val = (value1 << 8) | (value0 & 0xff);

	return 0;
}

static int ov7740_set_exp(struct regmap *regmap, int value)
{
	int ret;

	/* Turn off AEC/AGC */
	ret = regmap_update_bits(regmap, REG_REG13,
				 REG13_AEC_EN | REG13_AGC_EN, 0);
	if (ret)
		return ret;

	ret = regmap_write(regmap, REG_AEC, (unsigned char)value);
	if (ret)
		return ret;

	return regmap_write(regmap, REG_HAEC, (unsigned char)(value >> 8));
}

static int ov7740_set_autoexp(struct regmap *regmap,
			      enum v4l2_exposure_auto_type value)
{
	unsigned int reg;
	int ret;

	ret = regmap_read(regmap, REG_REG13, &reg);
	if (!ret) {
		if (value == V4L2_EXPOSURE_AUTO)
			reg |= (REG13_AEC_EN | REG13_AGC_EN);
		else
			reg &= ~(REG13_AEC_EN | REG13_AGC_EN);
		ret = regmap_write(regmap, REG_REG13, reg);
	}

	return ret;
}


static int ov7740_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov7740 *ov7740 = container_of(ctrl->handler,
					     struct ov7740, ctrl_handler);
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_AUTOGAIN:
		ret = ov7740_get_gain(ov7740, ctrl);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static int ov7740_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov7740 *ov7740 = container_of(ctrl->handler,
					     struct ov7740, ctrl_handler);
	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
	struct regmap *regmap = ov7740->regmap;
	int ret;
	u8 val = 0;

	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_AUTO_WHITE_BALANCE:
		ret = ov7740_set_white_balance(ov7740, ctrl->val);
		break;
	case V4L2_CID_SATURATION:
		ret = ov7740_set_saturation(regmap, ctrl->val);
		break;
	case V4L2_CID_BRIGHTNESS:
		ret = ov7740_set_brightness(regmap, ctrl->val);
		break;
	case V4L2_CID_CONTRAST:
		ret = ov7740_set_contrast(regmap, ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ret = regmap_update_bits(regmap, REG_REG0C,
					 REG0C_IMG_FLIP, val);
		break;
	case V4L2_CID_HFLIP:
		val = ctrl->val ? REG0C_IMG_MIRROR : 0x00;
		ret = regmap_update_bits(regmap, REG_REG0C,
					 REG0C_IMG_MIRROR, val);
		break;
	case V4L2_CID_AUTOGAIN:
		if (!ctrl->val)
			return ov7740_set_gain(regmap, ov7740->gain->val);

		ret = ov7740_set_autogain(regmap, ctrl->val);
		break;

	case V4L2_CID_EXPOSURE_AUTO:
		if (ctrl->val == V4L2_EXPOSURE_MANUAL)
			return ov7740_set_exp(regmap, ov7740->exposure->val);

		ret = ov7740_set_autoexp(regmap, ctrl->val);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops ov7740_ctrl_ops = {
	.g_volatile_ctrl = ov7740_get_volatile_ctrl,
	.s_ctrl = ov7740_set_ctrl,
};

static int ov7740_start_streaming(struct ov7740 *ov7740)
{
	int ret;

	if (ov7740->fmt) {
		ret = regmap_multi_reg_write(ov7740->regmap,
					     ov7740->fmt->regs,
					     ov7740->fmt->reg_num);
		if (ret)
			return ret;
	}

	if (ov7740->frmsize) {
		ret = regmap_multi_reg_write(ov7740->regmap,
					     ov7740->frmsize->regs,
					     ov7740->frmsize->reg_num);
		if (ret)
			return ret;
	}

	return __v4l2_ctrl_handler_setup(ov7740->subdev.ctrl_handler);
}

static int ov7740_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	mutex_lock(&ov7740->mutex);
	if (ov7740->streaming == enable) {
		mutex_unlock(&ov7740->mutex);
		return 0;
	}

	if (enable) {
		ret = pm_runtime_get_sync(&client->dev);
		if (ret < 0) {
			pm_runtime_put_noidle(&client->dev);
			goto err_unlock;
		}

		ret = ov7740_start_streaming(ov7740);
		if (ret)
			goto err_rpm_put;
	} else {
		pm_runtime_put(&client->dev);
	}

	ov7740->streaming = enable;

	mutex_unlock(&ov7740->mutex);
	return ret;

err_rpm_put:
	pm_runtime_put(&client->dev);
err_unlock:
	mutex_unlock(&ov7740->mutex);
	return ret;
}

static int ov7740_get_parm(struct v4l2_subdev *sd,
			   struct v4l2_streamparm *parms)
{
	struct v4l2_captureparm *cp = &parms->parm.capture;
	struct v4l2_fract *tpf = &cp->timeperframe;

	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	memset(cp, 0, sizeof(struct v4l2_captureparm));
	cp->capability = V4L2_CAP_TIMEPERFRAME;

	tpf->numerator = 1;
	tpf->denominator = 60;

	return 0;
}

static int ov7740_set_parm(struct v4l2_subdev *sd,
			   struct v4l2_streamparm *parms)
{
	struct v4l2_captureparm *cp = &parms->parm.capture;
	struct v4l2_fract *tpf = &cp->timeperframe;

	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	if (cp->extendedmode != 0)
		return -EINVAL;

	cp->capability = V4L2_CAP_TIMEPERFRAME;

	tpf->numerator = 1;
	tpf->denominator = 60;

	return 0;
}

static struct v4l2_subdev_video_ops ov7740_subdev_video_ops = {
	.s_stream = ov7740_set_stream,
	.s_parm = ov7740_set_parm,
	.g_parm = ov7740_get_parm,
};

static const struct reg_sequence ov7740_format_yuyv[] = {
	{0x12, 0x00},
	{0x36, 0x3f},
	{0x80, 0x7f},
	{0x83, 0x01},
};

static const struct reg_sequence ov7740_format_bggr8[] = {
	{0x36, 0x2f},
	{0x80, 0x01},
	{0x83, 0x04},
};

static const struct ov7740_pixfmt ov7740_formats[] = {
	{
		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.regs = ov7740_format_yuyv,
		.reg_num = ARRAY_SIZE(ov7740_format_yuyv),
	},
	{
		.mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.regs = ov7740_format_bggr8,
		.reg_num = ARRAY_SIZE(ov7740_format_bggr8),
	}
};
#define N_OV7740_FMTS ARRAY_SIZE(ov7740_formats)

static int ov7740_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->pad || code->index >= N_OV7740_FMTS)
		return -EINVAL;

	code->code = ov7740_formats[code->index].mbus_code;

	return 0;
}

static int ov7740_enum_frame_interval(struct v4l2_subdev *sd,
				struct v4l2_subdev_pad_config *cfg,
				struct v4l2_subdev_frame_interval_enum *fie)
{
	if (fie->pad)
		return -EINVAL;

	if (fie->index >= 1)
		return -EINVAL;

	if ((fie->width != VGA_WIDTH) || (fie->height != VGA_HEIGHT))
		return -EINVAL;

	fie->interval.numerator = 1;
	fie->interval.denominator = 60;

	return 0;
}

static int ov7740_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_pad_config *cfg,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->pad)
		return -EINVAL;

	if (fse->index > 0)
		return -EINVAL;

	fse->min_width = fse->max_width = VGA_WIDTH;
	fse->min_height = fse->max_height = VGA_HEIGHT;

	return 0;
}

static int ov7740_try_fmt_internal(struct v4l2_subdev *sd,
				   struct v4l2_mbus_framefmt *fmt,
				   const struct ov7740_pixfmt **ret_fmt,
				   const struct ov7740_framesize **ret_frmsize)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	const struct ov7740_framesize *fsize = &ov7740_framesizes[0];
	int index, i;

	for (index = 0; index < N_OV7740_FMTS; index++) {
		if (ov7740_formats[index].mbus_code == fmt->code)
			break;
	}
	if (index >= N_OV7740_FMTS) {
		/* default to first format */
		index = 0;
		fmt->code = ov7740_formats[0].mbus_code;
	}
	if (ret_fmt != NULL)
		*ret_fmt = ov7740_formats + index;

	for (i = 0; i < ARRAY_SIZE(ov7740_framesizes); i++) {
		if ((fsize->width >= fmt->width) &&
		    (fsize->height >= fmt->height)) {
			fmt->width = fsize->width;
			fmt->height = fsize->height;
			break;
		}

		fsize++;
	}

	if (ret_frmsize != NULL)
		*ret_frmsize = fsize;

	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = ov7740_formats[index].colorspace;

	ov7740->format = *fmt;

	return 0;
}

static int ov7740_set_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *format)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	const struct ov7740_pixfmt *ovfmt;
	const struct ov7740_framesize *fsize;
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	struct v4l2_mbus_framefmt *mbus_fmt;
#endif
	int ret;

	mutex_lock(&ov7740->mutex);
	if (format->pad) {
		ret = -EINVAL;
		goto error;
	}

	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
		ret = ov7740_try_fmt_internal(sd, &format->format, NULL, NULL);
		if (ret)
			goto error;
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
		*mbus_fmt = format->format;

		mutex_unlock(&ov7740->mutex);
		return 0;
#else
		ret = -ENOTTY;
		goto error;
#endif
	}

	ret = ov7740_try_fmt_internal(sd, &format->format, &ovfmt, &fsize);
	if (ret)
		goto error;

	ov7740->fmt = ovfmt;
	ov7740->frmsize = fsize;

	mutex_unlock(&ov7740->mutex);
	return 0;

error:
	mutex_unlock(&ov7740->mutex);
	return ret;
}

static int ov7740_get_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *format)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	struct v4l2_mbus_framefmt *mbus_fmt;
#endif
	int ret = 0;

	mutex_lock(&ov7740->mutex);
	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
		format->format = *mbus_fmt;
		ret = 0;
#else
		ret = -ENOTTY;
#endif
	} else {
		format->format = ov7740->format;
	}
	mutex_unlock(&ov7740->mutex);

	return ret;
}

static const struct v4l2_subdev_pad_ops ov7740_subdev_pad_ops = {
	.enum_frame_interval = ov7740_enum_frame_interval,
	.enum_frame_size = ov7740_enum_frame_size,
	.enum_mbus_code = ov7740_enum_mbus_code,
	.get_fmt = ov7740_get_fmt,
	.set_fmt = ov7740_set_fmt,
};

static const struct v4l2_subdev_ops ov7740_subdev_ops = {
	.core	= &ov7740_subdev_core_ops,
	.video	= &ov7740_subdev_video_ops,
	.pad	= &ov7740_subdev_pad_ops,
};

static void ov7740_get_default_format(struct v4l2_subdev *sd,
				      struct v4l2_mbus_framefmt *format)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);

	format->width = ov7740->frmsize->width;
	format->height = ov7740->frmsize->height;
	format->colorspace = ov7740->fmt->colorspace;
	format->code = ov7740->fmt->mbus_code;
	format->field = V4L2_FIELD_NONE;
}

#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
static int ov7740_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
	struct v4l2_mbus_framefmt *format =
				v4l2_subdev_get_try_format(sd, fh->pad, 0);

	mutex_lock(&ov7740->mutex);
	ov7740_get_default_format(sd, format);
	mutex_unlock(&ov7740->mutex);

	return 0;
}

static const struct v4l2_subdev_internal_ops ov7740_subdev_internal_ops = {
	.open = ov7740_open,
};
#endif

static int ov7740_probe_dt(struct i2c_client *client,
			   struct ov7740 *ov7740)
{
	ov7740->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
			GPIOD_OUT_HIGH);
	if (IS_ERR(ov7740->resetb_gpio)) {
		dev_info(&client->dev, "can't get %s GPIO\n", "reset");
		return PTR_ERR(ov7740->resetb_gpio);
	}

	ov7740->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
			GPIOD_OUT_LOW);
	if (IS_ERR(ov7740->pwdn_gpio)) {
		dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
		return PTR_ERR(ov7740->pwdn_gpio);
	}

	return 0;
}

static int ov7740_detect(struct ov7740 *ov7740)
{
	struct regmap *regmap = ov7740->regmap;
	unsigned int midh, midl, pidh, pidl;
	int ret;

	ret = regmap_read(regmap, REG_MIDH, &midh);
	if (ret)
		return ret;
	if (midh != 0x7f)
		return -ENODEV;

	ret = regmap_read(regmap, REG_MIDL, &midl);
	if (ret)
		return ret;
	if (midl != 0xa2)
		return -ENODEV;

	ret = regmap_read(regmap, REG_PIDH, &pidh);
	if (ret)
		return ret;
	if (pidh != 0x77)
		return -ENODEV;

	ret = regmap_read(regmap, REG_PIDL, &pidl);
	if (ret)
		return ret;
	if ((pidl != 0x40) && (pidl != 0x41) && (pidl != 0x42))
		return -ENODEV;

	return 0;
}

static int ov7740_init_controls(struct ov7740 *ov7740)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
	struct v4l2_ctrl_handler *ctrl_hdlr = &ov7740->ctrl_handler;
	int ret;

	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 2);
	if (ret < 0)
		return ret;

	ctrl_hdlr->lock = &ov7740->mutex;
	ov7740->auto_wb = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					  V4L2_CID_AUTO_WHITE_BALANCE,
					  0, 1, 1, 1);
	ov7740->blue_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					       V4L2_CID_BLUE_BALANCE,
					       0, 0xff, 1, 0x80);
	ov7740->red_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					      V4L2_CID_RED_BALANCE,
					      0, 0xff, 1, 0x80);

	ov7740->brightness = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					     V4L2_CID_BRIGHTNESS,
					     -255, 255, 1, 0);
	ov7740->contrast = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					   V4L2_CID_CONTRAST,
					   0, 127, 1, 0x20);
	ov7740->saturation = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
			  V4L2_CID_SATURATION, 0, 256, 1, 0x80);
	ov7740->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					V4L2_CID_HFLIP, 0, 1, 1, 0);
	ov7740->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					V4L2_CID_VFLIP, 0, 1, 1, 0);
	ov7740->gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
				       V4L2_CID_GAIN, 0, 1023, 1, 500);
	ov7740->auto_gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					    V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
	ov7740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
					   V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
	ov7740->auto_exposure = v4l2_ctrl_new_std_menu(ctrl_hdlr,
					&ov7740_ctrl_ops,
					V4L2_CID_EXPOSURE_AUTO,
					V4L2_EXPOSURE_MANUAL, 0,
					V4L2_EXPOSURE_AUTO);

	ov7740->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
	ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;

	v4l2_ctrl_auto_cluster(3, &ov7740->auto_wb, 0, false);
	v4l2_ctrl_auto_cluster(2, &ov7740->auto_gain, 0, true);
	v4l2_ctrl_auto_cluster(2, &ov7740->auto_exposure,
			       V4L2_EXPOSURE_MANUAL, false);
	v4l2_ctrl_cluster(2, &ov7740->hflip);

	ret = v4l2_ctrl_handler_setup(ctrl_hdlr);
	if (ret) {
		dev_err(&client->dev, "%s control init failed (%d)\n",
			__func__, ret);
		goto error;
	}

	ov7740->subdev.ctrl_handler = ctrl_hdlr;
	return 0;

error:
	v4l2_ctrl_handler_free(ctrl_hdlr);
	mutex_destroy(&ov7740->mutex);
	return ret;
}

static void ov7740_free_controls(struct ov7740 *ov7740)
{
	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
	mutex_destroy(&ov7740->mutex);
}

#define OV7740_MAX_REGISTER     0xff
static const struct regmap_config ov7740_regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= OV7740_MAX_REGISTER,
};

static int ov7740_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct ov7740 *ov7740;
	struct v4l2_subdev *sd;
	int ret;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev,
			"OV7740: I2C-Adapter doesn't support SMBUS\n");
		return -EIO;
	}

	ov7740 = devm_kzalloc(&client->dev, sizeof(*ov7740), GFP_KERNEL);
	if (!ov7740)
		return -ENOMEM;

	ov7740->xvclk = devm_clk_get(&client->dev, "xvclk");
	if (IS_ERR(ov7740->xvclk)) {
		ret = PTR_ERR(ov7740->xvclk);
		dev_err(&client->dev,
			"OV7740: fail to get xvclk: %d\n", ret);
		return ret;
	}

	ret = ov7740_probe_dt(client, ov7740);
	if (ret)
		return ret;

	ov7740->regmap = devm_regmap_init_i2c(client, &ov7740_regmap_config);
	if (IS_ERR(ov7740->regmap)) {
		ret = PTR_ERR(ov7740->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	sd = &ov7740->subdev;
	client->flags |= I2C_CLIENT_SCCB;
	v4l2_i2c_subdev_init(sd, client, &ov7740_subdev_ops);

#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
	sd->internal_ops = &ov7740_subdev_internal_ops;
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
#endif

#if defined(CONFIG_MEDIA_CONTROLLER)
	ov7740->pad.flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ret = media_entity_pads_init(&sd->entity, 1, &ov7740->pad);
	if (ret)
		return ret;
#endif

	ret = ov7740_set_power(ov7740, 1);
	if (ret)
		return ret;

	ret = ov7740_detect(ov7740);
	if (ret)
		goto error_detect;

	mutex_init(&ov7740->mutex);

	ret = ov7740_init_controls(ov7740);
	if (ret)
		goto error_init_controls;

	v4l_info(client, "chip found @ 0x%02x (%s)\n",
			client->addr << 1, client->adapter->name);

	ov7740->fmt = &ov7740_formats[0];
	ov7740->frmsize = &ov7740_framesizes[0];

	ov7740_get_default_format(sd, &ov7740->format);

	ret = v4l2_async_register_subdev(sd);
	if (ret)
		goto error_async_register;

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

	return 0;

error_async_register:
	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
error_init_controls:
	ov7740_free_controls(ov7740);
error_detect:
	ov7740_set_power(ov7740, 0);
	media_entity_cleanup(&ov7740->subdev.entity);

	return ret;
}

static int ov7740_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);

	mutex_destroy(&ov7740->mutex);
	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
#if defined(CONFIG_MEDIA_CONTROLLER)
	media_entity_cleanup(&ov7740->subdev.entity);
#endif
	v4l2_async_unregister_subdev(sd);
	ov7740_free_controls(ov7740);

	pm_runtime_get_sync(&client->dev);
	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
	pm_runtime_put_noidle(&client->dev);

	ov7740_set_power(ov7740, 0);
	return 0;
}

static int __maybe_unused ov7740_runtime_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);

	ov7740_set_power(ov7740, 0);

	return 0;
}

static int __maybe_unused ov7740_runtime_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);

	return ov7740_set_power(ov7740, 1);
}

static const struct i2c_device_id ov7740_id[] = {
	{ "ov7740", 0 },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, ov7740_id);

static const struct dev_pm_ops ov7740_pm_ops = {
	SET_RUNTIME_PM_OPS(ov7740_runtime_suspend, ov7740_runtime_resume, NULL)
};

static const struct of_device_id ov7740_of_match[] = {
	{.compatible = "ovti,ov7740", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ov7740_of_match);

static struct i2c_driver ov7740_i2c_driver = {
	.driver = {
		.name = "ov7740",
		.pm = &ov7740_pm_ops,
		.of_match_table = of_match_ptr(ov7740_of_match),
	},
	.probe    = ov7740_probe,
	.remove   = ov7740_remove,
	.id_table = ov7740_id,
};
module_i2c_driver(ov7740_i2c_driver);

MODULE_DESCRIPTION("The V4L2 driver for Omnivision 7740 sensor");
MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
MODULE_LICENSE("GPL v2");

Privacy Policy