summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/imx208.c
blob: 6f3d9c1b5879f942430d9e776ba0fc42ab342216 (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
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2021 Intel Corporation

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <asm/unaligned.h>

#define IMX208_REG_MODE_SELECT		0x0100
#define IMX208_MODE_STANDBY		0x00
#define IMX208_MODE_STREAMING		0x01

/* Chip ID */
#define IMX208_REG_CHIP_ID		0x0000
#define IMX208_CHIP_ID			0x0208

/* V_TIMING internal */
#define IMX208_REG_VTS			0x0340
#define IMX208_VTS_60FPS		0x0472
#define IMX208_VTS_BINNING		0x0239
#define IMX208_VTS_60FPS_MIN		0x0458
#define IMX208_VTS_BINNING_MIN		0x0230
#define IMX208_VTS_MAX			0xffff

/* HBLANK control - read only */
#define IMX208_PPL_384MHZ		2248
#define IMX208_PPL_96MHZ		2248

/* Exposure control */
#define IMX208_REG_EXPOSURE		0x0202
#define IMX208_EXPOSURE_MIN		4
#define IMX208_EXPOSURE_STEP		1
#define IMX208_EXPOSURE_DEFAULT		0x190
#define IMX208_EXPOSURE_MAX		65535

/* Analog gain control */
#define IMX208_REG_ANALOG_GAIN		0x0204
#define IMX208_ANA_GAIN_MIN		0
#define IMX208_ANA_GAIN_MAX		0x00e0
#define IMX208_ANA_GAIN_STEP		1
#define IMX208_ANA_GAIN_DEFAULT		0x0

/* Digital gain control */
#define IMX208_REG_GR_DIGITAL_GAIN	0x020e
#define IMX208_REG_R_DIGITAL_GAIN	0x0210
#define IMX208_REG_B_DIGITAL_GAIN	0x0212
#define IMX208_REG_GB_DIGITAL_GAIN	0x0214
#define IMX208_DIGITAL_GAIN_SHIFT	8

/* Orientation */
#define IMX208_REG_ORIENTATION_CONTROL	0x0101

/* Test Pattern Control */
#define IMX208_REG_TEST_PATTERN_MODE	0x0600
#define IMX208_TEST_PATTERN_DISABLE	0x0
#define IMX208_TEST_PATTERN_SOLID_COLOR	0x1
#define IMX208_TEST_PATTERN_COLOR_BARS	0x2
#define IMX208_TEST_PATTERN_GREY_COLOR	0x3
#define IMX208_TEST_PATTERN_PN9		0x4
#define IMX208_TEST_PATTERN_FIX_1	0x100
#define IMX208_TEST_PATTERN_FIX_2	0x101
#define IMX208_TEST_PATTERN_FIX_3	0x102
#define IMX208_TEST_PATTERN_FIX_4	0x103
#define IMX208_TEST_PATTERN_FIX_5	0x104
#define IMX208_TEST_PATTERN_FIX_6	0x105

/* OTP Access */
#define IMX208_OTP_BASE			0x3500
#define IMX208_OTP_SIZE			40

struct imx208_reg {
	u16 address;
	u8 val;
};

struct imx208_reg_list {
	u32 num_of_regs;
	const struct imx208_reg *regs;
};

/* Link frequency config */
struct imx208_link_freq_config {
	u32 pixels_per_line;

	/* PLL registers for this link frequency */
	struct imx208_reg_list reg_list;
};

/* Mode : resolution and related config&values */
struct imx208_mode {
	/* Frame width */
	u32 width;
	/* Frame height */
	u32 height;

	/* V-timing */
	u32 vts_def;
	u32 vts_min;

	/* Index of Link frequency config to be used */
	u32 link_freq_index;
	/* Default register values */
	struct imx208_reg_list reg_list;
};

static const struct imx208_reg pll_ctrl_reg[] = {
	{0x0305, 0x02},
	{0x0307, 0x50},
	{0x303C, 0x3C},
};

static const struct imx208_reg mode_1936x1096_60fps_regs[] = {
	{0x0340, 0x04},
	{0x0341, 0x72},
	{0x0342, 0x04},
	{0x0343, 0x64},
	{0x034C, 0x07},
	{0x034D, 0x90},
	{0x034E, 0x04},
	{0x034F, 0x48},
	{0x0381, 0x01},
	{0x0383, 0x01},
	{0x0385, 0x01},
	{0x0387, 0x01},
	{0x3048, 0x00},
	{0x3050, 0x01},
	{0x30D5, 0x00},
	{0x3301, 0x00},
	{0x3318, 0x62},
	{0x0202, 0x01},
	{0x0203, 0x90},
	{0x0205, 0x00},
};

static const struct imx208_reg mode_968_548_60fps_regs[] = {
	{0x0340, 0x02},
	{0x0341, 0x39},
	{0x0342, 0x08},
	{0x0343, 0xC8},
	{0x034C, 0x03},
	{0x034D, 0xC8},
	{0x034E, 0x02},
	{0x034F, 0x24},
	{0x0381, 0x01},
	{0x0383, 0x03},
	{0x0385, 0x01},
	{0x0387, 0x03},
	{0x3048, 0x01},
	{0x3050, 0x02},
	{0x30D5, 0x03},
	{0x3301, 0x10},
	{0x3318, 0x75},
	{0x0202, 0x01},
	{0x0203, 0x90},
	{0x0205, 0x00},
};

static const s64 imx208_discrete_digital_gain[] = {
	1, 2, 4, 8, 16,
};

static const char * const imx208_test_pattern_menu[] = {
	"Disabled",
	"Solid Color",
	"100% Color Bar",
	"Fade to Grey Color Bar",
	"PN9",
	"Fixed Pattern1",
	"Fixed Pattern2",
	"Fixed Pattern3",
	"Fixed Pattern4",
	"Fixed Pattern5",
	"Fixed Pattern6"
};

static const int imx208_test_pattern_val[] = {
	IMX208_TEST_PATTERN_DISABLE,
	IMX208_TEST_PATTERN_SOLID_COLOR,
	IMX208_TEST_PATTERN_COLOR_BARS,
	IMX208_TEST_PATTERN_GREY_COLOR,
	IMX208_TEST_PATTERN_PN9,
	IMX208_TEST_PATTERN_FIX_1,
	IMX208_TEST_PATTERN_FIX_2,
	IMX208_TEST_PATTERN_FIX_3,
	IMX208_TEST_PATTERN_FIX_4,
	IMX208_TEST_PATTERN_FIX_5,
	IMX208_TEST_PATTERN_FIX_6,
};

/* Configurations for supported link frequencies */
#define IMX208_MHZ			(1000 * 1000ULL)
#define IMX208_LINK_FREQ_384MHZ		(384ULL * IMX208_MHZ)
#define IMX208_LINK_FREQ_96MHZ		(96ULL * IMX208_MHZ)

#define IMX208_DATA_RATE_DOUBLE		2
#define IMX208_NUM_OF_LANES		2
#define IMX208_PIXEL_BITS		10

enum {
	IMX208_LINK_FREQ_384MHZ_INDEX,
	IMX208_LINK_FREQ_96MHZ_INDEX,
};

/*
 * pixel_rate = link_freq * data-rate * nr_of_lanes / bits_per_sample
 * data rate => double data rate; number of lanes => 2; bits per pixel => 10
 */
static u64 link_freq_to_pixel_rate(u64 f)
{
	f *= IMX208_DATA_RATE_DOUBLE * IMX208_NUM_OF_LANES;
	do_div(f, IMX208_PIXEL_BITS);

	return f;
}

/* Menu items for LINK_FREQ V4L2 control */
static const s64 link_freq_menu_items[] = {
	[IMX208_LINK_FREQ_384MHZ_INDEX] = IMX208_LINK_FREQ_384MHZ,
	[IMX208_LINK_FREQ_96MHZ_INDEX] = IMX208_LINK_FREQ_96MHZ,
};

/* Link frequency configs */
static const struct imx208_link_freq_config link_freq_configs[] = {
	[IMX208_LINK_FREQ_384MHZ_INDEX] = {
		.pixels_per_line = IMX208_PPL_384MHZ,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
			.regs = pll_ctrl_reg,
		}
	},
	[IMX208_LINK_FREQ_96MHZ_INDEX] = {
		.pixels_per_line = IMX208_PPL_96MHZ,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(pll_ctrl_reg),
			.regs = pll_ctrl_reg,
		}
	},
};

/* Mode configs */
static const struct imx208_mode supported_modes[] = {
	{
		.width = 1936,
		.height = 1096,
		.vts_def = IMX208_VTS_60FPS,
		.vts_min = IMX208_VTS_60FPS_MIN,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_1936x1096_60fps_regs),
			.regs = mode_1936x1096_60fps_regs,
		},
		.link_freq_index = IMX208_LINK_FREQ_384MHZ_INDEX,
	},
	{
		.width = 968,
		.height = 548,
		.vts_def = IMX208_VTS_BINNING,
		.vts_min = IMX208_VTS_BINNING_MIN,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_968_548_60fps_regs),
			.regs = mode_968_548_60fps_regs,
		},
		.link_freq_index = IMX208_LINK_FREQ_96MHZ_INDEX,
	},
};

struct imx208 {
	struct v4l2_subdev sd;
	struct media_pad pad;

	struct v4l2_ctrl_handler ctrl_handler;
	/* V4L2 Controls */
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *vflip;
	struct v4l2_ctrl *hflip;

	/* Current mode */
	const struct imx208_mode *cur_mode;

	/*
	 * Mutex for serialized access:
	 * Protect sensor set pad format and start/stop streaming safely.
	 * Protect access to sensor v4l2 controls.
	 */
	struct mutex imx208_mx;

	/* Streaming on/off */
	bool streaming;

	/* OTP data */
	bool otp_read;
	char otp_data[IMX208_OTP_SIZE];
};

static inline struct imx208 *to_imx208(struct v4l2_subdev *_sd)
{
	return container_of(_sd, struct imx208, sd);
}

/* Get bayer order based on flip setting. */
static u32 imx208_get_format_code(struct imx208 *imx208)
{
	/*
	 * Only one bayer order is supported.
	 * It depends on the flip settings.
	 */
	static const u32 codes[2][2] = {
		{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, },
		{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10, },
	};

	return codes[imx208->vflip->val][imx208->hflip->val];
}

/* Read registers up to 4 at a time */
static int imx208_read_reg(struct imx208 *imx208, u16 reg, u32 len, u32 *val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	struct i2c_msg msgs[2];
	u8 addr_buf[2] = { reg >> 8, reg & 0xff };
	u8 data_buf[4] = { 0, };
	int ret;

	if (len > 4)
		return -EINVAL;

	/* Write register address */
	msgs[0].addr = client->addr;
	msgs[0].flags = 0;
	msgs[0].len = ARRAY_SIZE(addr_buf);
	msgs[0].buf = addr_buf;

	/* Read data from register */
	msgs[1].addr = client->addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = len;
	msgs[1].buf = &data_buf[4 - len];

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret != ARRAY_SIZE(msgs))
		return -EIO;

	*val = get_unaligned_be32(data_buf);

	return 0;
}

/* Write registers up to 4 at a time */
static int imx208_write_reg(struct imx208 *imx208, u16 reg, u32 len, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	u8 buf[6];

	if (len > 4)
		return -EINVAL;

	put_unaligned_be16(reg, buf);
	put_unaligned_be32(val << (8 * (4 - len)), buf + 2);
	if (i2c_master_send(client, buf, len + 2) != len + 2)
		return -EIO;

	return 0;
}

/* Write a list of registers */
static int imx208_write_regs(struct imx208 *imx208,
			     const struct imx208_reg *regs, u32 len)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	unsigned int i;
	int ret;

	for (i = 0; i < len; i++) {
		ret = imx208_write_reg(imx208, regs[i].address, 1,
				       regs[i].val);
		if (ret) {
			dev_err_ratelimited(&client->dev,
					    "Failed to write reg 0x%4.4x. error = %d\n",
					    regs[i].address, ret);

			return ret;
		}
	}

	return 0;
}

/* Open sub-device */
static int imx208_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct v4l2_mbus_framefmt *try_fmt =
		v4l2_subdev_get_try_format(sd, fh->state, 0);

	/* Initialize try_fmt */
	try_fmt->width = supported_modes[0].width;
	try_fmt->height = supported_modes[0].height;
	try_fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
	try_fmt->field = V4L2_FIELD_NONE;

	return 0;
}

static int imx208_update_digital_gain(struct imx208 *imx208, u32 len, u32 val)
{
	int ret;

	val = imx208_discrete_digital_gain[val] << IMX208_DIGITAL_GAIN_SHIFT;

	ret = imx208_write_reg(imx208, IMX208_REG_GR_DIGITAL_GAIN, 2, val);
	if (ret)
		return ret;

	ret = imx208_write_reg(imx208, IMX208_REG_GB_DIGITAL_GAIN, 2, val);
	if (ret)
		return ret;

	ret = imx208_write_reg(imx208, IMX208_REG_R_DIGITAL_GAIN, 2, val);
	if (ret)
		return ret;

	return imx208_write_reg(imx208, IMX208_REG_B_DIGITAL_GAIN, 2, val);
}

static int imx208_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct imx208 *imx208 =
		container_of(ctrl->handler, struct imx208, ctrl_handler);
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	int ret;

	/*
	 * Applying V4L2 control value only happens
	 * when power is up for streaming
	 */
	if (!pm_runtime_get_if_in_use(&client->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_ANALOGUE_GAIN:
		ret = imx208_write_reg(imx208, IMX208_REG_ANALOG_GAIN,
				       2, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE:
		ret = imx208_write_reg(imx208, IMX208_REG_EXPOSURE,
				       2, ctrl->val);
		break;
	case V4L2_CID_DIGITAL_GAIN:
		ret = imx208_update_digital_gain(imx208, 2, ctrl->val);
		break;
	case V4L2_CID_VBLANK:
		/* Update VTS that meets expected vertical blanking */
		ret = imx208_write_reg(imx208, IMX208_REG_VTS, 2,
				       imx208->cur_mode->height + ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = imx208_write_reg(imx208, IMX208_REG_TEST_PATTERN_MODE,
				       2, imx208_test_pattern_val[ctrl->val]);
		break;
	case V4L2_CID_HFLIP:
	case V4L2_CID_VFLIP:
		ret = imx208_write_reg(imx208, IMX208_REG_ORIENTATION_CONTROL,
				       1,
				       imx208->hflip->val |
				       imx208->vflip->val << 1);
		break;
	default:
		ret = -EINVAL;
		dev_err(&client->dev,
			"ctrl(id:0x%x,val:0x%x) is not handled\n",
			ctrl->id, ctrl->val);
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops imx208_ctrl_ops = {
	.s_ctrl = imx208_set_ctrl,
};

static const struct v4l2_ctrl_config imx208_digital_gain_control = {
	.ops = &imx208_ctrl_ops,
	.id = V4L2_CID_DIGITAL_GAIN,
	.name = "Digital Gain",
	.type = V4L2_CTRL_TYPE_INTEGER_MENU,
	.min = 0,
	.max = ARRAY_SIZE(imx208_discrete_digital_gain) - 1,
	.step = 0,
	.def = 0,
	.menu_skip_mask = 0,
	.qmenu_int = imx208_discrete_digital_gain,
};

static int imx208_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	struct imx208 *imx208 = to_imx208(sd);

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

	code->code = imx208_get_format_code(imx208);

	return 0;
}

static int imx208_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	struct imx208 *imx208 = to_imx208(sd);

	if (fse->index >= ARRAY_SIZE(supported_modes))
		return -EINVAL;

	if (fse->code != imx208_get_format_code(imx208))
		return -EINVAL;

	fse->min_width = supported_modes[fse->index].width;
	fse->max_width = fse->min_width;
	fse->min_height = supported_modes[fse->index].height;
	fse->max_height = fse->min_height;

	return 0;
}

static void imx208_mode_to_pad_format(struct imx208 *imx208,
				      const struct imx208_mode *mode,
				      struct v4l2_subdev_format *fmt)
{
	fmt->format.width = mode->width;
	fmt->format.height = mode->height;
	fmt->format.code = imx208_get_format_code(imx208);
	fmt->format.field = V4L2_FIELD_NONE;
}

static int __imx208_get_pad_format(struct imx208 *imx208,
				   struct v4l2_subdev_state *sd_state,
				   struct v4l2_subdev_format *fmt)
{
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
		fmt->format = *v4l2_subdev_get_try_format(&imx208->sd,
							  sd_state,
							  fmt->pad);
	else
		imx208_mode_to_pad_format(imx208, imx208->cur_mode, fmt);

	return 0;
}

static int imx208_get_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_format *fmt)
{
	struct imx208 *imx208 = to_imx208(sd);
	int ret;

	mutex_lock(&imx208->imx208_mx);
	ret = __imx208_get_pad_format(imx208, sd_state, fmt);
	mutex_unlock(&imx208->imx208_mx);

	return ret;
}

static int imx208_set_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_format *fmt)
{
	struct imx208 *imx208 = to_imx208(sd);
	const struct imx208_mode *mode;
	s32 vblank_def;
	s32 vblank_min;
	s64 h_blank;
	s64 pixel_rate;
	s64 link_freq;

	mutex_lock(&imx208->imx208_mx);

	fmt->format.code = imx208_get_format_code(imx208);
	mode = v4l2_find_nearest_size(supported_modes,
				      ARRAY_SIZE(supported_modes), width, height,
				      fmt->format.width, fmt->format.height);
	imx208_mode_to_pad_format(imx208, mode, fmt);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		*v4l2_subdev_get_try_format(sd, sd_state, fmt->pad) = fmt->format;
	} else {
		imx208->cur_mode = mode;
		__v4l2_ctrl_s_ctrl(imx208->link_freq, mode->link_freq_index);
		link_freq = link_freq_menu_items[mode->link_freq_index];
		pixel_rate = link_freq_to_pixel_rate(link_freq);
		__v4l2_ctrl_s_ctrl_int64(imx208->pixel_rate, pixel_rate);
		/* Update limits and set FPS to default */
		vblank_def = imx208->cur_mode->vts_def -
			     imx208->cur_mode->height;
		vblank_min = imx208->cur_mode->vts_min -
			     imx208->cur_mode->height;
		__v4l2_ctrl_modify_range(imx208->vblank, vblank_min,
					 IMX208_VTS_MAX - imx208->cur_mode->height,
					 1, vblank_def);
		__v4l2_ctrl_s_ctrl(imx208->vblank, vblank_def);
		h_blank =
			link_freq_configs[mode->link_freq_index].pixels_per_line
			 - imx208->cur_mode->width;
		__v4l2_ctrl_modify_range(imx208->hblank, h_blank,
					 h_blank, 1, h_blank);
	}

	mutex_unlock(&imx208->imx208_mx);

	return 0;
}

/* Start streaming */
static int imx208_start_streaming(struct imx208 *imx208)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	const struct imx208_reg_list *reg_list;
	int ret, link_freq_index;

	/* Setup PLL */
	link_freq_index = imx208->cur_mode->link_freq_index;
	reg_list = &link_freq_configs[link_freq_index].reg_list;
	ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
	if (ret) {
		dev_err(&client->dev, "%s failed to set plls\n", __func__);
		return ret;
	}

	/* Apply default values of current mode */
	reg_list = &imx208->cur_mode->reg_list;
	ret = imx208_write_regs(imx208, reg_list->regs, reg_list->num_of_regs);
	if (ret) {
		dev_err(&client->dev, "%s failed to set mode\n", __func__);
		return ret;
	}

	/* Apply customized values from user */
	ret =  __v4l2_ctrl_handler_setup(imx208->sd.ctrl_handler);
	if (ret)
		return ret;

	/* set stream on register */
	return imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
				1, IMX208_MODE_STREAMING);
}

/* Stop streaming */
static int imx208_stop_streaming(struct imx208 *imx208)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	int ret;

	/* set stream off register */
	ret = imx208_write_reg(imx208, IMX208_REG_MODE_SELECT,
			       1, IMX208_MODE_STANDBY);
	if (ret)
		dev_err(&client->dev, "%s failed to set stream\n", __func__);

	/*
	 * Return success even if it was an error, as there is nothing the
	 * caller can do about it.
	 */
	return 0;
}

static int imx208_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct imx208 *imx208 = to_imx208(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	mutex_lock(&imx208->imx208_mx);
	if (imx208->streaming == enable) {
		mutex_unlock(&imx208->imx208_mx);
		return 0;
	}

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

		/*
		 * Apply default & customized values
		 * and then start streaming.
		 */
		ret = imx208_start_streaming(imx208);
		if (ret)
			goto err_rpm_put;
	} else {
		imx208_stop_streaming(imx208);
		pm_runtime_put(&client->dev);
	}

	imx208->streaming = enable;
	mutex_unlock(&imx208->imx208_mx);

	/* vflip and hflip cannot change during streaming */
	v4l2_ctrl_grab(imx208->vflip, enable);
	v4l2_ctrl_grab(imx208->hflip, enable);

	return ret;

err_rpm_put:
	pm_runtime_put(&client->dev);
	mutex_unlock(&imx208->imx208_mx);

	return ret;
}

static int __maybe_unused imx208_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx208 *imx208 = to_imx208(sd);

	if (imx208->streaming)
		imx208_stop_streaming(imx208);

	return 0;
}

static int __maybe_unused imx208_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx208 *imx208 = to_imx208(sd);
	int ret;

	if (imx208->streaming) {
		ret = imx208_start_streaming(imx208);
		if (ret)
			goto error;
	}

	return 0;

error:
	imx208_stop_streaming(imx208);
	imx208->streaming = 0;

	return ret;
}

/* Verify chip ID */
static int imx208_identify_module(struct imx208 *imx208)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	int ret;
	u32 val;

	ret = imx208_read_reg(imx208, IMX208_REG_CHIP_ID,
			      2, &val);
	if (ret) {
		dev_err(&client->dev, "failed to read chip id %x\n",
			IMX208_CHIP_ID);
		return ret;
	}

	if (val != IMX208_CHIP_ID) {
		dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
			IMX208_CHIP_ID, val);
		return -EIO;
	}

	return 0;
}

static const struct v4l2_subdev_video_ops imx208_video_ops = {
	.s_stream = imx208_set_stream,
};

static const struct v4l2_subdev_pad_ops imx208_pad_ops = {
	.enum_mbus_code = imx208_enum_mbus_code,
	.get_fmt = imx208_get_pad_format,
	.set_fmt = imx208_set_pad_format,
	.enum_frame_size = imx208_enum_frame_size,
};

static const struct v4l2_subdev_ops imx208_subdev_ops = {
	.video = &imx208_video_ops,
	.pad = &imx208_pad_ops,
};

static const struct v4l2_subdev_internal_ops imx208_internal_ops = {
	.open = imx208_open,
};

static int imx208_read_otp(struct imx208 *imx208)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	struct i2c_msg msgs[2];
	u8 addr_buf[2] = { IMX208_OTP_BASE >> 8, IMX208_OTP_BASE & 0xff };
	int ret = 0;

	mutex_lock(&imx208->imx208_mx);

	if (imx208->otp_read)
		goto out_unlock;

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

	/* Write register address */
	msgs[0].addr = client->addr;
	msgs[0].flags = 0;
	msgs[0].len = ARRAY_SIZE(addr_buf);
	msgs[0].buf = addr_buf;

	/* Read data from registers */
	msgs[1].addr = client->addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = sizeof(imx208->otp_data);
	msgs[1].buf = imx208->otp_data;

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret == ARRAY_SIZE(msgs)) {
		imx208->otp_read = true;
		ret = 0;
	}

	pm_runtime_put(&client->dev);

out_unlock:
	mutex_unlock(&imx208->imx208_mx);

	return ret;
}

static ssize_t otp_read(struct file *filp, struct kobject *kobj,
			struct bin_attribute *bin_attr,
			char *buf, loff_t off, size_t count)
{
	struct i2c_client *client = to_i2c_client(kobj_to_dev(kobj));
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx208 *imx208 = to_imx208(sd);
	int ret;

	ret = imx208_read_otp(imx208);
	if (ret)
		return ret;

	memcpy(buf, &imx208->otp_data[off], count);
	return count;
}

static const BIN_ATTR_RO(otp, IMX208_OTP_SIZE);

/* Initialize control handlers */
static int imx208_init_controls(struct imx208 *imx208)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx208->sd);
	struct v4l2_ctrl_handler *ctrl_hdlr = &imx208->ctrl_handler;
	s64 exposure_max;
	s64 vblank_def;
	s64 vblank_min;
	s64 pixel_rate_min;
	s64 pixel_rate_max;
	int ret;

	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
	if (ret)
		return ret;

	mutex_init(&imx208->imx208_mx);
	ctrl_hdlr->lock = &imx208->imx208_mx;
	imx208->link_freq =
		v4l2_ctrl_new_int_menu(ctrl_hdlr,
				       &imx208_ctrl_ops,
				       V4L2_CID_LINK_FREQ,
				       ARRAY_SIZE(link_freq_menu_items) - 1,
				       0, link_freq_menu_items);

	if (imx208->link_freq)
		imx208->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
	pixel_rate_min =
		link_freq_to_pixel_rate(link_freq_menu_items[ARRAY_SIZE(link_freq_menu_items) - 1]);
	/* By default, PIXEL_RATE is read only */
	imx208->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
					       V4L2_CID_PIXEL_RATE,
					       pixel_rate_min, pixel_rate_max,
					       1, pixel_rate_max);

	vblank_def = imx208->cur_mode->vts_def - imx208->cur_mode->height;
	vblank_min = imx208->cur_mode->vts_min - imx208->cur_mode->height;
	imx208->vblank =
		v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_VBLANK,
				  vblank_min,
				  IMX208_VTS_MAX - imx208->cur_mode->height, 1,
				  vblank_def);

	imx208->hblank =
		v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_HBLANK,
				  IMX208_PPL_384MHZ - imx208->cur_mode->width,
				  IMX208_PPL_384MHZ - imx208->cur_mode->width,
				  1,
				  IMX208_PPL_384MHZ - imx208->cur_mode->width);

	if (imx208->hblank)
		imx208->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	exposure_max = imx208->cur_mode->vts_def - 8;
	v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_EXPOSURE,
			  IMX208_EXPOSURE_MIN, exposure_max,
			  IMX208_EXPOSURE_STEP, IMX208_EXPOSURE_DEFAULT);

	imx208->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
					  V4L2_CID_HFLIP, 0, 1, 1, 0);
	imx208->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops,
					  V4L2_CID_VFLIP, 0, 1, 1, 0);

	v4l2_ctrl_new_std(ctrl_hdlr, &imx208_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
			  IMX208_ANA_GAIN_MIN, IMX208_ANA_GAIN_MAX,
			  IMX208_ANA_GAIN_STEP, IMX208_ANA_GAIN_DEFAULT);

	v4l2_ctrl_new_custom(ctrl_hdlr, &imx208_digital_gain_control, NULL);

	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &imx208_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(imx208_test_pattern_menu) - 1,
				     0, 0, imx208_test_pattern_menu);

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

	imx208->sd.ctrl_handler = ctrl_hdlr;

	return 0;

error:
	v4l2_ctrl_handler_free(ctrl_hdlr);
	mutex_destroy(&imx208->imx208_mx);

	return ret;
}

static void imx208_free_controls(struct imx208 *imx208)
{
	v4l2_ctrl_handler_free(imx208->sd.ctrl_handler);
}

static int imx208_probe(struct i2c_client *client)
{
	struct imx208 *imx208;
	int ret;
	u32 val = 0;

	device_property_read_u32(&client->dev, "clock-frequency", &val);
	if (val != 19200000) {
		dev_err(&client->dev,
			"Unsupported clock-frequency %u. Expected 19200000.\n",
			val);
		return -EINVAL;
	}

	imx208 = devm_kzalloc(&client->dev, sizeof(*imx208), GFP_KERNEL);
	if (!imx208)
		return -ENOMEM;

	/* Initialize subdev */
	v4l2_i2c_subdev_init(&imx208->sd, client, &imx208_subdev_ops);

	/* Check module identity */
	ret = imx208_identify_module(imx208);
	if (ret) {
		dev_err(&client->dev, "failed to find sensor: %d", ret);
		goto error_probe;
	}

	/* Set default mode to max resolution */
	imx208->cur_mode = &supported_modes[0];

	ret = imx208_init_controls(imx208);
	if (ret) {
		dev_err(&client->dev, "failed to init controls: %d", ret);
		goto error_probe;
	}

	/* Initialize subdev */
	imx208->sd.internal_ops = &imx208_internal_ops;
	imx208->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	imx208->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	/* Initialize source pad */
	imx208->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_pads_init(&imx208->sd.entity, 1, &imx208->pad);
	if (ret) {
		dev_err(&client->dev, "%s failed:%d\n", __func__, ret);
		goto error_handler_free;
	}

	ret = v4l2_async_register_subdev_sensor(&imx208->sd);
	if (ret < 0)
		goto error_media_entity;

	ret = device_create_bin_file(&client->dev, &bin_attr_otp);
	if (ret) {
		dev_err(&client->dev, "sysfs otp creation failed\n");
		goto error_async_subdev;
	}

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

	return 0;

error_async_subdev:
	v4l2_async_unregister_subdev(&imx208->sd);

error_media_entity:
	media_entity_cleanup(&imx208->sd.entity);

error_handler_free:
	imx208_free_controls(imx208);

error_probe:
	mutex_destroy(&imx208->imx208_mx);

	return ret;
}

static int imx208_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx208 *imx208 = to_imx208(sd);

	device_remove_bin_file(&client->dev, &bin_attr_otp);
	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	imx208_free_controls(imx208);

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

	mutex_destroy(&imx208->imx208_mx);

	return 0;
}

static const struct dev_pm_ops imx208_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(imx208_suspend, imx208_resume)
};

#ifdef CONFIG_ACPI
static const struct acpi_device_id imx208_acpi_ids[] = {
	{ "INT3478" },
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(acpi, imx208_acpi_ids);
#endif

static struct i2c_driver imx208_i2c_driver = {
	.driver = {
		.name = "imx208",
		.pm = &imx208_pm_ops,
		.acpi_match_table = ACPI_PTR(imx208_acpi_ids),
	},
	.probe_new = imx208_probe,
	.remove = imx208_remove,
};

module_i2c_driver(imx208_i2c_driver);

MODULE_AUTHOR("Yeh, Andy <andy.yeh@intel.com>");
MODULE_AUTHOR("Chen, Ping-chung <ping-chung.chen@intel.com>");
MODULE_AUTHOR("Shawn Tu <shawnx.tu@intel.com>");
MODULE_DESCRIPTION("Sony IMX208 sensor driver");
MODULE_LICENSE("GPL v2");