summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/imx335.c
blob: 964a81bec5a4ce414d25827a16736f682c368613 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Sony imx335 Camera Sensor Driver
 *
 * Copyright (C) 2021 Intel Corporation
 */
#include <asm/unaligned.h>

#include <linux/clk.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-fwnode.h>
#include <media/v4l2-subdev.h>

/* Streaming Mode */
#define IMX335_REG_MODE_SELECT	0x3000
#define IMX335_MODE_STANDBY	0x01
#define IMX335_MODE_STREAMING	0x00

/* Lines per frame */
#define IMX335_REG_LPFR		0x3030

/* Chip ID */
#define IMX335_REG_ID		0x3912
#define IMX335_ID		0x00

/* Exposure control */
#define IMX335_REG_SHUTTER	0x3058
#define IMX335_EXPOSURE_MIN	1
#define IMX335_EXPOSURE_OFFSET	9
#define IMX335_EXPOSURE_STEP	1
#define IMX335_EXPOSURE_DEFAULT	0x0648

/* Analog gain control */
#define IMX335_REG_AGAIN	0x30e8
#define IMX335_AGAIN_MIN	0
#define IMX335_AGAIN_MAX	240
#define IMX335_AGAIN_STEP	1
#define IMX335_AGAIN_DEFAULT	0

/* Group hold register */
#define IMX335_REG_HOLD		0x3001

/* Input clock rate */
#define IMX335_INCLK_RATE	24000000

/* CSI2 HW configuration */
#define IMX335_LINK_FREQ	594000000
#define IMX335_NUM_DATA_LANES	4

#define IMX335_REG_MIN		0x00
#define IMX335_REG_MAX		0xfffff

/**
 * struct imx335_reg - imx335 sensor register
 * @address: Register address
 * @val: Register value
 */
struct imx335_reg {
	u16 address;
	u8 val;
};

/**
 * struct imx335_reg_list - imx335 sensor register list
 * @num_of_regs: Number of registers in the list
 * @regs: Pointer to register list
 */
struct imx335_reg_list {
	u32 num_of_regs;
	const struct imx335_reg *regs;
};

/**
 * struct imx335_mode - imx335 sensor mode structure
 * @width: Frame width
 * @height: Frame height
 * @code: Format code
 * @hblank: Horizontal blanking in lines
 * @vblank: Vertical blanking in lines
 * @vblank_min: Minimum vertical blanking in lines
 * @vblank_max: Maximum vertical blanking in lines
 * @pclk: Sensor pixel clock
 * @link_freq_idx: Link frequency index
 * @reg_list: Register list for sensor mode
 */
struct imx335_mode {
	u32 width;
	u32 height;
	u32 code;
	u32 hblank;
	u32 vblank;
	u32 vblank_min;
	u32 vblank_max;
	u64 pclk;
	u32 link_freq_idx;
	struct imx335_reg_list reg_list;
};

/**
 * struct imx335 - imx335 sensor device structure
 * @dev: Pointer to generic device
 * @client: Pointer to i2c client
 * @sd: V4L2 sub-device
 * @pad: Media pad. Only one pad supported
 * @reset_gpio: Sensor reset gpio
 * @inclk: Sensor input clock
 * @ctrl_handler: V4L2 control handler
 * @link_freq_ctrl: Pointer to link frequency control
 * @pclk_ctrl: Pointer to pixel clock control
 * @hblank_ctrl: Pointer to horizontal blanking control
 * @vblank_ctrl: Pointer to vertical blanking control
 * @exp_ctrl: Pointer to exposure control
 * @again_ctrl: Pointer to analog gain control
 * @vblank: Vertical blanking in lines
 * @cur_mode: Pointer to current selected sensor mode
 * @mutex: Mutex for serializing sensor controls
 */
struct imx335 {
	struct device *dev;
	struct i2c_client *client;
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct gpio_desc *reset_gpio;
	struct clk *inclk;
	struct v4l2_ctrl_handler ctrl_handler;
	struct v4l2_ctrl *link_freq_ctrl;
	struct v4l2_ctrl *pclk_ctrl;
	struct v4l2_ctrl *hblank_ctrl;
	struct v4l2_ctrl *vblank_ctrl;
	struct {
		struct v4l2_ctrl *exp_ctrl;
		struct v4l2_ctrl *again_ctrl;
	};
	u32 vblank;
	const struct imx335_mode *cur_mode;
	struct mutex mutex;
};

static const s64 link_freq[] = {
	IMX335_LINK_FREQ,
};

/* Sensor mode registers */
static const struct imx335_reg mode_2592x1940_regs[] = {
	{0x3000, 0x01},
	{0x3002, 0x00},
	{0x300c, 0x3b},
	{0x300d, 0x2a},
	{0x3018, 0x04},
	{0x302c, 0x3c},
	{0x302e, 0x20},
	{0x3056, 0x94},
	{0x3074, 0xc8},
	{0x3076, 0x28},
	{0x304c, 0x00},
	{0x314c, 0xc6},
	{0x315a, 0x02},
	{0x3168, 0xa0},
	{0x316a, 0x7e},
	{0x31a1, 0x00},
	{0x3288, 0x21},
	{0x328a, 0x02},
	{0x3414, 0x05},
	{0x3416, 0x18},
	{0x3648, 0x01},
	{0x364a, 0x04},
	{0x364c, 0x04},
	{0x3678, 0x01},
	{0x367c, 0x31},
	{0x367e, 0x31},
	{0x3706, 0x10},
	{0x3708, 0x03},
	{0x3714, 0x02},
	{0x3715, 0x02},
	{0x3716, 0x01},
	{0x3717, 0x03},
	{0x371c, 0x3d},
	{0x371d, 0x3f},
	{0x372c, 0x00},
	{0x372d, 0x00},
	{0x372e, 0x46},
	{0x372f, 0x00},
	{0x3730, 0x89},
	{0x3731, 0x00},
	{0x3732, 0x08},
	{0x3733, 0x01},
	{0x3734, 0xfe},
	{0x3735, 0x05},
	{0x3740, 0x02},
	{0x375d, 0x00},
	{0x375e, 0x00},
	{0x375f, 0x11},
	{0x3760, 0x01},
	{0x3768, 0x1b},
	{0x3769, 0x1b},
	{0x376a, 0x1b},
	{0x376b, 0x1b},
	{0x376c, 0x1a},
	{0x376d, 0x17},
	{0x376e, 0x0f},
	{0x3776, 0x00},
	{0x3777, 0x00},
	{0x3778, 0x46},
	{0x3779, 0x00},
	{0x377a, 0x89},
	{0x377b, 0x00},
	{0x377c, 0x08},
	{0x377d, 0x01},
	{0x377e, 0x23},
	{0x377f, 0x02},
	{0x3780, 0xd9},
	{0x3781, 0x03},
	{0x3782, 0xf5},
	{0x3783, 0x06},
	{0x3784, 0xa5},
	{0x3788, 0x0f},
	{0x378a, 0xd9},
	{0x378b, 0x03},
	{0x378c, 0xeb},
	{0x378d, 0x05},
	{0x378e, 0x87},
	{0x378f, 0x06},
	{0x3790, 0xf5},
	{0x3792, 0x43},
	{0x3794, 0x7a},
	{0x3796, 0xa1},
	{0x37b0, 0x36},
	{0x3a00, 0x01},
};

/* Supported sensor mode configurations */
static const struct imx335_mode supported_mode = {
	.width = 2592,
	.height = 1940,
	.hblank = 342,
	.vblank = 2560,
	.vblank_min = 2560,
	.vblank_max = 133060,
	.pclk = 396000000,
	.link_freq_idx = 0,
	.code = MEDIA_BUS_FMT_SRGGB12_1X12,
	.reg_list = {
		.num_of_regs = ARRAY_SIZE(mode_2592x1940_regs),
		.regs = mode_2592x1940_regs,
	},
};

/**
 * to_imx335() - imx335 V4L2 sub-device to imx335 device.
 * @subdev: pointer to imx335 V4L2 sub-device
 *
 * Return: pointer to imx335 device
 */
static inline struct imx335 *to_imx335(struct v4l2_subdev *subdev)
{
	return container_of(subdev, struct imx335, sd);
}

/**
 * imx335_read_reg() - Read registers.
 * @imx335: pointer to imx335 device
 * @reg: register address
 * @len: length of bytes to read. Max supported bytes is 4
 * @val: pointer to register value to be filled.
 *
 * Big endian register addresses with little endian values.
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_read_reg(struct imx335 *imx335, u16 reg, u32 len, u32 *val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx335->sd);
	struct i2c_msg msgs[2] = {0};
	u8 addr_buf[2] = {0};
	u8 data_buf[4] = {0};
	int ret;

	if (WARN_ON(len > 4))
		return -EINVAL;

	put_unaligned_be16(reg, addr_buf);

	/* 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;

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

	*val = get_unaligned_le32(data_buf);

	return 0;
}

/**
 * imx335_write_reg() - Write register
 * @imx335: pointer to imx335 device
 * @reg: register address
 * @len: length of bytes. Max supported bytes is 4
 * @val: register value
 *
 * Big endian register addresses with little endian values.
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_write_reg(struct imx335 *imx335, u16 reg, u32 len, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&imx335->sd);
	u8 buf[6] = {0};

	if (WARN_ON(len > 4))
		return -EINVAL;

	put_unaligned_be16(reg, buf);
	put_unaligned_le32(val, buf + 2);
	if (i2c_master_send(client, buf, len + 2) != len + 2)
		return -EIO;

	return 0;
}

/**
 * imx335_write_regs() - Write a list of registers
 * @imx335: pointer to imx335 device
 * @regs: list of registers to be written
 * @len: length of registers array
 *
 * Return: 0 if successful. error code otherwise.
 */
static int imx335_write_regs(struct imx335 *imx335,
			     const struct imx335_reg *regs, u32 len)
{
	unsigned int i;
	int ret;

	for (i = 0; i < len; i++) {
		ret = imx335_write_reg(imx335, regs[i].address, 1, regs[i].val);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * imx335_update_controls() - Update control ranges based on streaming mode
 * @imx335: pointer to imx335 device
 * @mode: pointer to imx335_mode sensor mode
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_update_controls(struct imx335 *imx335,
				  const struct imx335_mode *mode)
{
	int ret;

	ret = __v4l2_ctrl_s_ctrl(imx335->link_freq_ctrl, mode->link_freq_idx);
	if (ret)
		return ret;

	ret = __v4l2_ctrl_s_ctrl(imx335->hblank_ctrl, mode->hblank);
	if (ret)
		return ret;

	return __v4l2_ctrl_modify_range(imx335->vblank_ctrl, mode->vblank_min,
					mode->vblank_max, 1, mode->vblank);
}

/**
 * imx335_update_exp_gain() - Set updated exposure and gain
 * @imx335: pointer to imx335 device
 * @exposure: updated exposure value
 * @gain: updated analog gain value
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_update_exp_gain(struct imx335 *imx335, u32 exposure, u32 gain)
{
	u32 lpfr, shutter;
	int ret;

	lpfr = imx335->vblank + imx335->cur_mode->height;
	shutter = lpfr - exposure;

	dev_dbg(imx335->dev, "Set exp %u, analog gain %u, shutter %u, lpfr %u",
		exposure, gain, shutter, lpfr);

	ret = imx335_write_reg(imx335, IMX335_REG_HOLD, 1, 1);
	if (ret)
		return ret;

	ret = imx335_write_reg(imx335, IMX335_REG_LPFR, 3, lpfr);
	if (ret)
		goto error_release_group_hold;

	ret = imx335_write_reg(imx335, IMX335_REG_SHUTTER, 3, shutter);
	if (ret)
		goto error_release_group_hold;

	ret = imx335_write_reg(imx335, IMX335_REG_AGAIN, 2, gain);

error_release_group_hold:
	imx335_write_reg(imx335, IMX335_REG_HOLD, 1, 0);

	return ret;
}

/**
 * imx335_set_ctrl() - Set subdevice control
 * @ctrl: pointer to v4l2_ctrl structure
 *
 * Supported controls:
 * - V4L2_CID_VBLANK
 * - cluster controls:
 *   - V4L2_CID_ANALOGUE_GAIN
 *   - V4L2_CID_EXPOSURE
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct imx335 *imx335 =
		container_of(ctrl->handler, struct imx335, ctrl_handler);
	u32 analog_gain;
	u32 exposure;
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_VBLANK:
		imx335->vblank = imx335->vblank_ctrl->val;

		dev_dbg(imx335->dev, "Received vblank %u, new lpfr %u",
			imx335->vblank,
			imx335->vblank + imx335->cur_mode->height);

		ret = __v4l2_ctrl_modify_range(imx335->exp_ctrl,
					       IMX335_EXPOSURE_MIN,
					       imx335->vblank +
					       imx335->cur_mode->height -
					       IMX335_EXPOSURE_OFFSET,
					       1, IMX335_EXPOSURE_DEFAULT);
		break;
	case V4L2_CID_EXPOSURE:
		/* Set controls only if sensor is in power on state */
		if (!pm_runtime_get_if_in_use(imx335->dev))
			return 0;

		exposure = ctrl->val;
		analog_gain = imx335->again_ctrl->val;

		dev_dbg(imx335->dev, "Received exp %u, analog gain %u",
			exposure, analog_gain);

		ret = imx335_update_exp_gain(imx335, exposure, analog_gain);

		pm_runtime_put(imx335->dev);

		break;
	default:
		dev_err(imx335->dev, "Invalid control %d", ctrl->id);
		ret = -EINVAL;
	}

	return ret;
}

/* V4l2 subdevice control ops*/
static const struct v4l2_ctrl_ops imx335_ctrl_ops = {
	.s_ctrl = imx335_set_ctrl,
};

/**
 * imx335_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @code: V4L2 sub-device code enumeration need to be filled
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index > 0)
		return -EINVAL;

	code->code = supported_mode.code;

	return 0;
}

/**
 * imx335_enum_frame_size() - Enumerate V4L2 sub-device frame sizes
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @fsize: V4L2 sub-device size enumeration need to be filled
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_frame_size_enum *fsize)
{
	if (fsize->index > 0)
		return -EINVAL;

	if (fsize->code != supported_mode.code)
		return -EINVAL;

	fsize->min_width = supported_mode.width;
	fsize->max_width = fsize->min_width;
	fsize->min_height = supported_mode.height;
	fsize->max_height = fsize->min_height;

	return 0;
}

/**
 * imx335_fill_pad_format() - Fill subdevice pad format
 *                            from selected sensor mode
 * @imx335: pointer to imx335 device
 * @mode: pointer to imx335_mode sensor mode
 * @fmt: V4L2 sub-device format need to be filled
 */
static void imx335_fill_pad_format(struct imx335 *imx335,
				   const struct imx335_mode *mode,
				   struct v4l2_subdev_format *fmt)
{
	fmt->format.width = mode->width;
	fmt->format.height = mode->height;
	fmt->format.code = mode->code;
	fmt->format.field = V4L2_FIELD_NONE;
	fmt->format.colorspace = V4L2_COLORSPACE_RAW;
	fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
	fmt->format.quantization = V4L2_QUANTIZATION_DEFAULT;
	fmt->format.xfer_func = V4L2_XFER_FUNC_NONE;
}

/**
 * imx335_get_pad_format() - Get subdevice pad format
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @fmt: V4L2 sub-device format need to be set
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_get_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_format *fmt)
{
	struct imx335 *imx335 = to_imx335(sd);

	mutex_lock(&imx335->mutex);

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		struct v4l2_mbus_framefmt *framefmt;

		framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
		fmt->format = *framefmt;
	} else {
		imx335_fill_pad_format(imx335, imx335->cur_mode, fmt);
	}

	mutex_unlock(&imx335->mutex);

	return 0;
}

/**
 * imx335_set_pad_format() - Set subdevice pad format
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @fmt: V4L2 sub-device format need to be set
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_set_pad_format(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_format *fmt)
{
	struct imx335 *imx335 = to_imx335(sd);
	const struct imx335_mode *mode;
	int ret = 0;

	mutex_lock(&imx335->mutex);

	mode = &supported_mode;
	imx335_fill_pad_format(imx335, mode, fmt);

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		struct v4l2_mbus_framefmt *framefmt;

		framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
		*framefmt = fmt->format;
	} else {
		ret = imx335_update_controls(imx335, mode);
		if (!ret)
			imx335->cur_mode = mode;
	}

	mutex_unlock(&imx335->mutex);

	return ret;
}

/**
 * imx335_init_pad_cfg() - Initialize sub-device pad configuration
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_init_pad_cfg(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *sd_state)
{
	struct imx335 *imx335 = to_imx335(sd);
	struct v4l2_subdev_format fmt = { 0 };

	fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
	imx335_fill_pad_format(imx335, &supported_mode, &fmt);

	return imx335_set_pad_format(sd, sd_state, &fmt);
}

/**
 * imx335_start_streaming() - Start sensor stream
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_start_streaming(struct imx335 *imx335)
{
	const struct imx335_reg_list *reg_list;
	int ret;

	/* Write sensor mode registers */
	reg_list = &imx335->cur_mode->reg_list;
	ret = imx335_write_regs(imx335, reg_list->regs,
				reg_list->num_of_regs);
	if (ret) {
		dev_err(imx335->dev, "fail to write initial registers");
		return ret;
	}

	/* Setup handler will write actual exposure and gain */
	ret =  __v4l2_ctrl_handler_setup(imx335->sd.ctrl_handler);
	if (ret) {
		dev_err(imx335->dev, "fail to setup handler");
		return ret;
	}

	/* Start streaming */
	ret = imx335_write_reg(imx335, IMX335_REG_MODE_SELECT,
			       1, IMX335_MODE_STREAMING);
	if (ret) {
		dev_err(imx335->dev, "fail to start streaming");
		return ret;
	}

	/* Initial regulator stabilization period */
	usleep_range(18000, 20000);

	return 0;
}

/**
 * imx335_stop_streaming() - Stop sensor stream
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_stop_streaming(struct imx335 *imx335)
{
	return imx335_write_reg(imx335, IMX335_REG_MODE_SELECT,
				1, IMX335_MODE_STANDBY);
}

/**
 * imx335_set_stream() - Enable sensor streaming
 * @sd: pointer to imx335 subdevice
 * @enable: set to enable sensor streaming
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct imx335 *imx335 = to_imx335(sd);
	int ret;

	mutex_lock(&imx335->mutex);

	if (enable) {
		ret = pm_runtime_resume_and_get(imx335->dev);
		if (ret)
			goto error_unlock;

		ret = imx335_start_streaming(imx335);
		if (ret)
			goto error_power_off;
	} else {
		imx335_stop_streaming(imx335);
		pm_runtime_put(imx335->dev);
	}

	mutex_unlock(&imx335->mutex);

	return 0;

error_power_off:
	pm_runtime_put(imx335->dev);
error_unlock:
	mutex_unlock(&imx335->mutex);

	return ret;
}

/**
 * imx335_detect() - Detect imx335 sensor
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, -EIO if sensor id does not match
 */
static int imx335_detect(struct imx335 *imx335)
{
	int ret;
	u32 val;

	ret = imx335_read_reg(imx335, IMX335_REG_ID, 2, &val);
	if (ret)
		return ret;

	if (val != IMX335_ID) {
		dev_err(imx335->dev, "chip id mismatch: %x!=%x",
			IMX335_ID, val);
		return -ENXIO;
	}

	return 0;
}

/**
 * imx335_parse_hw_config() - Parse HW configuration and check if supported
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_parse_hw_config(struct imx335 *imx335)
{
	struct fwnode_handle *fwnode = dev_fwnode(imx335->dev);
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY
	};
	struct fwnode_handle *ep;
	unsigned long rate;
	unsigned int i;
	int ret;

	if (!fwnode)
		return -ENXIO;

	/* Request optional reset pin */
	imx335->reset_gpio = devm_gpiod_get_optional(imx335->dev, "reset",
						     GPIOD_OUT_LOW);
	if (IS_ERR(imx335->reset_gpio)) {
		dev_err(imx335->dev, "failed to get reset gpio %ld",
			PTR_ERR(imx335->reset_gpio));
		return PTR_ERR(imx335->reset_gpio);
	}

	/* Get sensor input clock */
	imx335->inclk = devm_clk_get(imx335->dev, NULL);
	if (IS_ERR(imx335->inclk)) {
		dev_err(imx335->dev, "could not get inclk");
		return PTR_ERR(imx335->inclk);
	}

	rate = clk_get_rate(imx335->inclk);
	if (rate != IMX335_INCLK_RATE) {
		dev_err(imx335->dev, "inclk frequency mismatch");
		return -EINVAL;
	}

	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
	if (!ep)
		return -ENXIO;

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

	if (bus_cfg.bus.mipi_csi2.num_data_lanes != IMX335_NUM_DATA_LANES) {
		dev_err(imx335->dev,
			"number of CSI2 data lanes %d is not supported",
			bus_cfg.bus.mipi_csi2.num_data_lanes);
		ret = -EINVAL;
		goto done_endpoint_free;
	}

	if (!bus_cfg.nr_of_link_frequencies) {
		dev_err(imx335->dev, "no link frequencies defined");
		ret = -EINVAL;
		goto done_endpoint_free;
	}

	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
		if (bus_cfg.link_frequencies[i] == IMX335_LINK_FREQ)
			goto done_endpoint_free;

	ret = -EINVAL;

done_endpoint_free:
	v4l2_fwnode_endpoint_free(&bus_cfg);

	return ret;
}

/* V4l2 subdevice ops */
static const struct v4l2_subdev_video_ops imx335_video_ops = {
	.s_stream = imx335_set_stream,
};

static const struct v4l2_subdev_pad_ops imx335_pad_ops = {
	.init_cfg = imx335_init_pad_cfg,
	.enum_mbus_code = imx335_enum_mbus_code,
	.enum_frame_size = imx335_enum_frame_size,
	.get_fmt = imx335_get_pad_format,
	.set_fmt = imx335_set_pad_format,
};

static const struct v4l2_subdev_ops imx335_subdev_ops = {
	.video = &imx335_video_ops,
	.pad = &imx335_pad_ops,
};

/**
 * imx335_power_on() - Sensor power on sequence
 * @dev: pointer to i2c device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_power_on(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct imx335 *imx335 = to_imx335(sd);
	int ret;

	gpiod_set_value_cansleep(imx335->reset_gpio, 1);

	ret = clk_prepare_enable(imx335->inclk);
	if (ret) {
		dev_err(imx335->dev, "fail to enable inclk");
		goto error_reset;
	}

	usleep_range(20, 22);

	return 0;

error_reset:
	gpiod_set_value_cansleep(imx335->reset_gpio, 0);

	return ret;
}

/**
 * imx335_power_off() - Sensor power off sequence
 * @dev: pointer to i2c device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_power_off(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct imx335 *imx335 = to_imx335(sd);

	gpiod_set_value_cansleep(imx335->reset_gpio, 0);

	clk_disable_unprepare(imx335->inclk);

	return 0;
}

/**
 * imx335_init_controls() - Initialize sensor subdevice controls
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_init_controls(struct imx335 *imx335)
{
	struct v4l2_ctrl_handler *ctrl_hdlr = &imx335->ctrl_handler;
	const struct imx335_mode *mode = imx335->cur_mode;
	u32 lpfr;
	int ret;

	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 6);
	if (ret)
		return ret;

	/* Serialize controls with sensor device */
	ctrl_hdlr->lock = &imx335->mutex;

	/* Initialize exposure and gain */
	lpfr = mode->vblank + mode->height;
	imx335->exp_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
					     &imx335_ctrl_ops,
					     V4L2_CID_EXPOSURE,
					     IMX335_EXPOSURE_MIN,
					     lpfr - IMX335_EXPOSURE_OFFSET,
					     IMX335_EXPOSURE_STEP,
					     IMX335_EXPOSURE_DEFAULT);

	imx335->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
					       &imx335_ctrl_ops,
					       V4L2_CID_ANALOGUE_GAIN,
					       IMX335_AGAIN_MIN,
					       IMX335_AGAIN_MAX,
					       IMX335_AGAIN_STEP,
					       IMX335_AGAIN_DEFAULT);

	v4l2_ctrl_cluster(2, &imx335->exp_ctrl);

	imx335->vblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
						&imx335_ctrl_ops,
						V4L2_CID_VBLANK,
						mode->vblank_min,
						mode->vblank_max,
						1, mode->vblank);

	/* Read only controls */
	imx335->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
					      &imx335_ctrl_ops,
					      V4L2_CID_PIXEL_RATE,
					      mode->pclk, mode->pclk,
					      1, mode->pclk);

	imx335->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr,
							&imx335_ctrl_ops,
							V4L2_CID_LINK_FREQ,
							ARRAY_SIZE(link_freq) -
							1,
							mode->link_freq_idx,
							link_freq);
	if (imx335->link_freq_ctrl)
		imx335->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	imx335->hblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
						&imx335_ctrl_ops,
						V4L2_CID_HBLANK,
						mode->hblank,
						mode->hblank,
						1, mode->hblank);
	if (imx335->hblank_ctrl)
		imx335->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	if (ctrl_hdlr->error) {
		dev_err(imx335->dev, "control init failed: %d",
			ctrl_hdlr->error);
		v4l2_ctrl_handler_free(ctrl_hdlr);
		return ctrl_hdlr->error;
	}

	imx335->sd.ctrl_handler = ctrl_hdlr;

	return 0;
}

/**
 * imx335_probe() - I2C client device binding
 * @client: pointer to i2c client device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_probe(struct i2c_client *client)
{
	struct imx335 *imx335;
	int ret;

	imx335 = devm_kzalloc(&client->dev, sizeof(*imx335), GFP_KERNEL);
	if (!imx335)
		return -ENOMEM;

	imx335->dev = &client->dev;

	/* Initialize subdev */
	v4l2_i2c_subdev_init(&imx335->sd, client, &imx335_subdev_ops);

	ret = imx335_parse_hw_config(imx335);
	if (ret) {
		dev_err(imx335->dev, "HW configuration is not supported");
		return ret;
	}

	mutex_init(&imx335->mutex);

	ret = imx335_power_on(imx335->dev);
	if (ret) {
		dev_err(imx335->dev, "failed to power-on the sensor");
		goto error_mutex_destroy;
	}

	/* Check module identity */
	ret = imx335_detect(imx335);
	if (ret) {
		dev_err(imx335->dev, "failed to find sensor: %d", ret);
		goto error_power_off;
	}

	/* Set default mode to max resolution */
	imx335->cur_mode = &supported_mode;
	imx335->vblank = imx335->cur_mode->vblank;

	ret = imx335_init_controls(imx335);
	if (ret) {
		dev_err(imx335->dev, "failed to init controls: %d", ret);
		goto error_power_off;
	}

	/* Initialize subdev */
	imx335->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	imx335->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	/* Initialize source pad */
	imx335->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_pads_init(&imx335->sd.entity, 1, &imx335->pad);
	if (ret) {
		dev_err(imx335->dev, "failed to init entity pads: %d", ret);
		goto error_handler_free;
	}

	ret = v4l2_async_register_subdev_sensor(&imx335->sd);
	if (ret < 0) {
		dev_err(imx335->dev,
			"failed to register async subdev: %d", ret);
		goto error_media_entity;
	}

	pm_runtime_set_active(imx335->dev);
	pm_runtime_enable(imx335->dev);
	pm_runtime_idle(imx335->dev);

	return 0;

error_media_entity:
	media_entity_cleanup(&imx335->sd.entity);
error_handler_free:
	v4l2_ctrl_handler_free(imx335->sd.ctrl_handler);
error_power_off:
	imx335_power_off(imx335->dev);
error_mutex_destroy:
	mutex_destroy(&imx335->mutex);

	return ret;
}

/**
 * imx335_remove() - I2C client device unbinding
 * @client: pointer to I2C client device
 *
 * Return: 0 if successful, error code otherwise.
 */
static void imx335_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct imx335 *imx335 = to_imx335(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	v4l2_ctrl_handler_free(sd->ctrl_handler);

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		imx335_power_off(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	mutex_destroy(&imx335->mutex);
}

static const struct dev_pm_ops imx335_pm_ops = {
	SET_RUNTIME_PM_OPS(imx335_power_off, imx335_power_on, NULL)
};

static const struct of_device_id imx335_of_match[] = {
	{ .compatible = "sony,imx335" },
	{ }
};

MODULE_DEVICE_TABLE(of, imx335_of_match);

static struct i2c_driver imx335_driver = {
	.probe = imx335_probe,
	.remove = imx335_remove,
	.driver = {
		.name = "imx335",
		.pm = &imx335_pm_ops,
		.of_match_table = imx335_of_match,
	},
};

module_i2c_driver(imx335_driver);

MODULE_DESCRIPTION("Sony imx335 sensor driver");
MODULE_LICENSE("GPL");