aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/i2c/st-mipid02.c
blob: 9369f38dbf3de69a35e32b29bf6ee334eb174add (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for ST MIPID02 CSI-2 to PARALLEL bridge
 *
 * Copyright (C) STMicroelectronics SA 2019
 * Authors: Mickael Guene <mickael.guene@st.com>
 *          for STMicroelectronics.
 *
 *
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#define MIPID02_CLK_LANE_WR_REG1			0x01
#define MIPID02_CLK_LANE_REG1				0x02
#define MIPID02_CLK_LANE_REG3				0x04
#define MIPID02_DATA_LANE0_REG1				0x05
#define MIPID02_DATA_LANE0_REG2				0x06
#define MIPID02_DATA_LANE1_REG1				0x09
#define MIPID02_DATA_LANE1_REG2				0x0a
#define MIPID02_MODE_REG1				0x14
#define MIPID02_MODE_REG2				0x15
#define MIPID02_DATA_ID_RREG				0x17
#define MIPID02_DATA_SELECTION_CTRL			0x19
#define MIPID02_PIX_WIDTH_CTRL				0x1e
#define MIPID02_PIX_WIDTH_CTRL_EMB			0x1f

/* Bits definition for MIPID02_CLK_LANE_REG1 */
#define CLK_ENABLE					BIT(0)
/* Bits definition for MIPID02_CLK_LANE_REG3 */
#define CLK_MIPI_CSI					BIT(1)
/* Bits definition for MIPID02_DATA_LANE0_REG1 */
#define DATA_ENABLE					BIT(0)
/* Bits definition for MIPID02_DATA_LANEx_REG2 */
#define DATA_MIPI_CSI					BIT(0)
/* Bits definition for MIPID02_MODE_REG1 */
#define MODE_DATA_SWAP					BIT(2)
#define MODE_NO_BYPASS					BIT(6)
/* Bits definition for MIPID02_MODE_REG2 */
#define MODE_HSYNC_ACTIVE_HIGH				BIT(1)
#define MODE_VSYNC_ACTIVE_HIGH				BIT(2)
/* Bits definition for MIPID02_DATA_SELECTION_CTRL */
#define SELECTION_MANUAL_DATA				BIT(2)
#define SELECTION_MANUAL_WIDTH				BIT(3)

static const u32 mipid02_supported_fmt_codes[] = {
	MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
	MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
	MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
	MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
	MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SGBRG12_1X12,
	MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SRGGB12_1X12,
	MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_BGR888_1X24
};

/* regulator supplies */
static const char * const mipid02_supply_name[] = {
	"VDDE", /* 1.8V digital I/O supply */
	"VDDIN", /* 1V8 voltage regulator supply */
};

#define MIPID02_NUM_SUPPLIES		ARRAY_SIZE(mipid02_supply_name)

#define MIPID02_SINK_0			0
#define MIPID02_SINK_1			1
#define MIPID02_SOURCE			2
#define MIPID02_PAD_NB			3

struct mipid02_dev {
	struct i2c_client *i2c_client;
	struct regulator_bulk_data supplies[MIPID02_NUM_SUPPLIES];
	struct v4l2_subdev sd;
	struct media_pad pad[MIPID02_PAD_NB];
	struct clk *xclk;
	struct gpio_desc *reset_gpio;
	/* endpoints info */
	struct v4l2_fwnode_endpoint rx;
	u64 link_frequency;
	struct v4l2_fwnode_endpoint tx;
	/* remote source */
	struct v4l2_async_subdev asd;
	struct v4l2_async_notifier notifier;
	struct v4l2_subdev *s_subdev;
	/* registers */
	struct {
		u8 clk_lane_reg1;
		u8 data_lane0_reg1;
		u8 data_lane1_reg1;
		u8 mode_reg1;
		u8 mode_reg2;
		u8 data_id_rreg;
		u8 pix_width_ctrl;
		u8 pix_width_ctrl_emb;
	} r;
	/* lock to protect all members below */
	struct mutex lock;
	bool streaming;
	struct v4l2_mbus_framefmt fmt;
};

static int bpp_from_code(__u32 code)
{
	switch (code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
	case MEDIA_BUS_FMT_SGBRG8_1X8:
	case MEDIA_BUS_FMT_SGRBG8_1X8:
	case MEDIA_BUS_FMT_SRGGB8_1X8:
		return 8;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
	case MEDIA_BUS_FMT_SGBRG10_1X10:
	case MEDIA_BUS_FMT_SGRBG10_1X10:
	case MEDIA_BUS_FMT_SRGGB10_1X10:
		return 10;
	case MEDIA_BUS_FMT_SBGGR12_1X12:
	case MEDIA_BUS_FMT_SGBRG12_1X12:
	case MEDIA_BUS_FMT_SGRBG12_1X12:
	case MEDIA_BUS_FMT_SRGGB12_1X12:
		return 12;
	case MEDIA_BUS_FMT_UYVY8_1X16:
		return 16;
	case MEDIA_BUS_FMT_BGR888_1X24:
		return 24;
	default:
		return 0;
	}
}

static u8 data_type_from_code(__u32 code)
{
	switch (code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
	case MEDIA_BUS_FMT_SGBRG8_1X8:
	case MEDIA_BUS_FMT_SGRBG8_1X8:
	case MEDIA_BUS_FMT_SRGGB8_1X8:
		return 0x2a;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
	case MEDIA_BUS_FMT_SGBRG10_1X10:
	case MEDIA_BUS_FMT_SGRBG10_1X10:
	case MEDIA_BUS_FMT_SRGGB10_1X10:
		return 0x2b;
	case MEDIA_BUS_FMT_SBGGR12_1X12:
	case MEDIA_BUS_FMT_SGBRG12_1X12:
	case MEDIA_BUS_FMT_SGRBG12_1X12:
	case MEDIA_BUS_FMT_SRGGB12_1X12:
		return 0x2c;
	case MEDIA_BUS_FMT_UYVY8_1X16:
		return 0x1e;
	case MEDIA_BUS_FMT_BGR888_1X24:
		return 0x24;
	default:
		return 0;
	}
}

static void init_format(struct v4l2_mbus_framefmt *fmt)
{
	fmt->code = MEDIA_BUS_FMT_SBGGR8_1X8;
	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(V4L2_COLORSPACE_SRGB);
	fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
	fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(V4L2_COLORSPACE_SRGB);
	fmt->width = 640;
	fmt->height = 480;
}

static __u32 get_fmt_code(__u32 code)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(mipid02_supported_fmt_codes); i++) {
		if (code == mipid02_supported_fmt_codes[i])
			return code;
	}

	return mipid02_supported_fmt_codes[0];
}

static __u32 serial_to_parallel_code(__u32 serial)
{
	if (serial == MEDIA_BUS_FMT_UYVY8_1X16)
		return MEDIA_BUS_FMT_UYVY8_2X8;
	if (serial == MEDIA_BUS_FMT_BGR888_1X24)
		return MEDIA_BUS_FMT_BGR888_3X8;

	return serial;
}

static inline struct mipid02_dev *to_mipid02_dev(struct v4l2_subdev *sd)
{
	return container_of(sd, struct mipid02_dev, sd);
}

static int mipid02_read_reg(struct mipid02_dev *bridge, u16 reg, u8 *val)
{
	struct i2c_client *client = bridge->i2c_client;
	struct i2c_msg msg[2];
	u8 buf[2];
	int ret;

	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;

	msg[0].addr = client->addr;
	msg[0].flags = client->flags;
	msg[0].buf = buf;
	msg[0].len = sizeof(buf);

	msg[1].addr = client->addr;
	msg[1].flags = client->flags | I2C_M_RD;
	msg[1].buf = val;
	msg[1].len = 1;

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret < 0) {
		dev_dbg(&client->dev, "%s: %x i2c_transfer, reg: %x => %d\n",
			    __func__, client->addr, reg, ret);
		return ret;
	}

	return 0;
}

static int mipid02_write_reg(struct mipid02_dev *bridge, u16 reg, u8 val)
{
	struct i2c_client *client = bridge->i2c_client;
	struct i2c_msg msg;
	u8 buf[3];
	int ret;

	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;
	buf[2] = val;

	msg.addr = client->addr;
	msg.flags = client->flags;
	msg.buf = buf;
	msg.len = sizeof(buf);

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0) {
		dev_dbg(&client->dev, "%s: i2c_transfer, reg: %x => %d\n",
			    __func__, reg, ret);
		return ret;
	}

	return 0;
}

static int mipid02_get_regulators(struct mipid02_dev *bridge)
{
	unsigned int i;

	for (i = 0; i < MIPID02_NUM_SUPPLIES; i++)
		bridge->supplies[i].supply = mipid02_supply_name[i];

	return devm_regulator_bulk_get(&bridge->i2c_client->dev,
				       MIPID02_NUM_SUPPLIES,
				       bridge->supplies);
}

static void mipid02_apply_reset(struct mipid02_dev *bridge)
{
	gpiod_set_value_cansleep(bridge->reset_gpio, 0);
	usleep_range(5000, 10000);
	gpiod_set_value_cansleep(bridge->reset_gpio, 1);
	usleep_range(5000, 10000);
	gpiod_set_value_cansleep(bridge->reset_gpio, 0);
	usleep_range(5000, 10000);
}

static int mipid02_set_power_on(struct mipid02_dev *bridge)
{
	struct i2c_client *client = bridge->i2c_client;
	int ret;

	ret = clk_prepare_enable(bridge->xclk);
	if (ret) {
		dev_err(&client->dev, "%s: failed to enable clock\n", __func__);
		return ret;
	}

	ret = regulator_bulk_enable(MIPID02_NUM_SUPPLIES,
				    bridge->supplies);
	if (ret) {
		dev_err(&client->dev, "%s: failed to enable regulators\n",
			    __func__);
		goto xclk_off;
	}

	if (bridge->reset_gpio) {
		dev_dbg(&client->dev, "apply reset");
		mipid02_apply_reset(bridge);
	} else {
		dev_dbg(&client->dev, "don't apply reset");
		usleep_range(5000, 10000);
	}

	return 0;

xclk_off:
	clk_disable_unprepare(bridge->xclk);
	return ret;
}

static void mipid02_set_power_off(struct mipid02_dev *bridge)
{
	regulator_bulk_disable(MIPID02_NUM_SUPPLIES, bridge->supplies);
	clk_disable_unprepare(bridge->xclk);
}

static int mipid02_detect(struct mipid02_dev *bridge)
{
	u8 reg;

	/*
	 * There is no version registers. Just try to read register
	 * MIPID02_CLK_LANE_WR_REG1.
	 */
	return mipid02_read_reg(bridge, MIPID02_CLK_LANE_WR_REG1, &reg);
}

static u32 mipid02_get_link_freq_from_cid_pixel_rate(struct mipid02_dev *bridge,
						     struct v4l2_subdev *subdev)
{
	struct v4l2_fwnode_endpoint *ep = &bridge->rx;
	struct v4l2_ctrl *ctrl;
	u32 pixel_clock;
	u32 bpp = bpp_from_code(bridge->fmt.code);

	ctrl = v4l2_ctrl_find(subdev->ctrl_handler, V4L2_CID_PIXEL_RATE);
	if (!ctrl)
		return 0;
	pixel_clock = v4l2_ctrl_g_ctrl_int64(ctrl);

	return pixel_clock * bpp / (2 * ep->bus.mipi_csi2.num_data_lanes);
}

/*
 * We need to know link frequency to setup clk_lane_reg1 timings. Link frequency
 * will be computed using connected device V4L2_CID_PIXEL_RATE, bit per pixel
 * and number of lanes.
 */
static int mipid02_configure_from_rx_speed(struct mipid02_dev *bridge)
{
	struct i2c_client *client = bridge->i2c_client;
	struct v4l2_subdev *subdev = bridge->s_subdev;
	u32 link_freq;

	link_freq = mipid02_get_link_freq_from_cid_pixel_rate(bridge, subdev);
	if (!link_freq) {
		dev_err(&client->dev, "Failed to detect link frequency");
		return -EINVAL;
	}

	dev_dbg(&client->dev, "detect link_freq = %d Hz", link_freq);
	bridge->r.clk_lane_reg1 |= (2000000000 / link_freq) << 2;

	return 0;
}

static int mipid02_configure_clk_lane(struct mipid02_dev *bridge)
{
	struct i2c_client *client = bridge->i2c_client;
	struct v4l2_fwnode_endpoint *ep = &bridge->rx;
	bool *polarities = ep->bus.mipi_csi2.lane_polarities;

	/* midid02 doesn't support clock lane remapping */
	if (ep->bus.mipi_csi2.clock_lane != 0) {
		dev_err(&client->dev, "clk lane must be map to lane 0\n");
		return -EINVAL;
	}
	bridge->r.clk_lane_reg1 |= (polarities[0] << 1) | CLK_ENABLE;

	return 0;
}

static int mipid02_configure_data0_lane(struct mipid02_dev *bridge, int nb,
					bool are_lanes_swap, bool *polarities)
{
	bool are_pin_swap = are_lanes_swap ? polarities[2] : polarities[1];

	if (nb == 1 && are_lanes_swap)
		return 0;

	/*
	 * data lane 0 as pin swap polarity reversed compared to clock and
	 * data lane 1
	 */
	if (!are_pin_swap)
		bridge->r.data_lane0_reg1 = 1 << 1;
	bridge->r.data_lane0_reg1 |= DATA_ENABLE;

	return 0;
}

static int mipid02_configure_data1_lane(struct mipid02_dev *bridge, int nb,
					bool are_lanes_swap, bool *polarities)
{
	bool are_pin_swap = are_lanes_swap ? polarities[1] : polarities[2];

	if (nb == 1 && !are_lanes_swap)
		return 0;

	if (are_pin_swap)
		bridge->r.data_lane1_reg1 = 1 << 1;
	bridge->r.data_lane1_reg1 |= DATA_ENABLE;

	return 0;
}

static int mipid02_configure_from_rx(struct mipid02_dev *bridge)
{
	struct v4l2_fwnode_endpoint *ep = &bridge->rx;
	bool are_lanes_swap = ep->bus.mipi_csi2.data_lanes[0] == 2;
	bool *polarities = ep->bus.mipi_csi2.lane_polarities;
	int nb = ep->bus.mipi_csi2.num_data_lanes;
	int ret;

	ret = mipid02_configure_clk_lane(bridge);
	if (ret)
		return ret;

	ret = mipid02_configure_data0_lane(bridge, nb, are_lanes_swap,
					   polarities);
	if (ret)
		return ret;

	ret = mipid02_configure_data1_lane(bridge, nb, are_lanes_swap,
					   polarities);
	if (ret)
		return ret;

	bridge->r.mode_reg1 |= are_lanes_swap ? MODE_DATA_SWAP : 0;
	bridge->r.mode_reg1 |= (nb - 1) << 1;

	return mipid02_configure_from_rx_speed(bridge);
}

static int mipid02_configure_from_tx(struct mipid02_dev *bridge)
{
	struct v4l2_fwnode_endpoint *ep = &bridge->tx;

	bridge->r.pix_width_ctrl = ep->bus.parallel.bus_width;
	bridge->r.pix_width_ctrl_emb = ep->bus.parallel.bus_width;
	if (ep->bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
		bridge->r.mode_reg2 |= MODE_HSYNC_ACTIVE_HIGH;
	if (ep->bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
		bridge->r.mode_reg2 |= MODE_VSYNC_ACTIVE_HIGH;

	return 0;
}

static int mipid02_configure_from_code(struct mipid02_dev *bridge)
{
	u8 data_type;

	bridge->r.data_id_rreg = 0;
	data_type = data_type_from_code(bridge->fmt.code);
	if (!data_type)
		return -EINVAL;
	bridge->r.data_id_rreg = data_type;

	return 0;
}

static int mipid02_stream_disable(struct mipid02_dev *bridge)
{
	struct i2c_client *client = bridge->i2c_client;
	int ret;

	/* Disable all lanes */
	ret = mipid02_write_reg(bridge, MIPID02_CLK_LANE_REG1, 0);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE0_REG1, 0);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE1_REG1, 0);
	if (ret)
		goto error;
error:
	if (ret)
		dev_err(&client->dev, "failed to stream off %d", ret);

	return ret;
}

static int mipid02_stream_enable(struct mipid02_dev *bridge)
{
	struct i2c_client *client = bridge->i2c_client;
	int ret = -EINVAL;

	if (!bridge->s_subdev)
		goto error;

	memset(&bridge->r, 0, sizeof(bridge->r));
	/* build registers content */
	ret = mipid02_configure_from_rx(bridge);
	if (ret)
		goto error;
	ret = mipid02_configure_from_tx(bridge);
	if (ret)
		goto error;
	ret = mipid02_configure_from_code(bridge);
	if (ret)
		goto error;

	/* write mipi registers */
	ret = mipid02_write_reg(bridge, MIPID02_CLK_LANE_REG1,
		bridge->r.clk_lane_reg1);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_CLK_LANE_REG3, CLK_MIPI_CSI);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE0_REG1,
		bridge->r.data_lane0_reg1);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE0_REG2,
		DATA_MIPI_CSI);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE1_REG1,
		bridge->r.data_lane1_reg1);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_LANE1_REG2,
		DATA_MIPI_CSI);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_MODE_REG1,
		MODE_NO_BYPASS | bridge->r.mode_reg1);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_MODE_REG2,
		bridge->r.mode_reg2);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_ID_RREG,
		bridge->r.data_id_rreg);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_DATA_SELECTION_CTRL,
		SELECTION_MANUAL_DATA | SELECTION_MANUAL_WIDTH);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_PIX_WIDTH_CTRL,
		bridge->r.pix_width_ctrl);
	if (ret)
		goto error;
	ret = mipid02_write_reg(bridge, MIPID02_PIX_WIDTH_CTRL_EMB,
		bridge->r.pix_width_ctrl_emb);
	if (ret)
		goto error;

	return 0;

error:
	dev_err(&client->dev, "failed to stream on %d", ret);
	mipid02_stream_disable(bridge);

	return ret;
}

static int mipid02_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct mipid02_dev *bridge = to_mipid02_dev(sd);
	struct i2c_client *client = bridge->i2c_client;
	int ret = 0;

	dev_dbg(&client->dev, "%s : requested %d / current = %d", __func__,
		    enable, bridge->streaming);
	mutex_lock(&bridge->lock);

	if (bridge->streaming == enable)
		goto out;

	ret = enable ? mipid02_stream_enable(bridge) :
		       mipid02_stream_disable(bridge);
	if (!ret)
		bridge->streaming = enable;

out:
	dev_dbg(&client->dev, "%s current now = %d / %d", __func__,
		    bridge->streaming, ret);
	mutex_unlock(&bridge->lock);

	return ret;
}

static int mipid02_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	struct mipid02_dev *bridge = to_mipid02_dev(sd);
	int ret = 0;

	switch (code->pad) {
	case MIPID02_SINK_0:
		if (code->index >= ARRAY_SIZE(mipid02_supported_fmt_codes))
			ret = -EINVAL;
		else
			code->code = mipid02_supported_fmt_codes[code->index];
		break;
	case MIPID02_SOURCE:
		if (code->index == 0)
			code->code = serial_to_parallel_code(bridge->fmt.code);
		else
			ret = -EINVAL;
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int mipid02_get_fmt(struct v4l2_subdev *sd,
			   struct v4l2_subdev_pad_config *cfg,
			   struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mbus_fmt = &format->format;
	struct mipid02_dev *bridge = to_mipid02_dev(sd);
	struct i2c_client *client = bridge->i2c_client;
	struct v4l2_mbus_framefmt *fmt;

	dev_dbg(&client->dev, "%s probe %d", __func__, format->pad);

	if (format->pad >= MIPID02_PAD_NB)
		return -EINVAL;
	/* second CSI-2 pad not yet supported */
	if (format->pad == MIPID02_SINK_1)
		return -EINVAL;

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		fmt = v4l2_subdev_get_try_format(&bridge->sd, cfg, format->pad);
	else
		fmt = &bridge->fmt;

	mutex_lock(&bridge->lock);

	*mbus_fmt = *fmt;
	/* code may need to be converted for source */
	if (format->pad == MIPID02_SOURCE)
		mbus_fmt->code = serial_to_parallel_code(mbus_fmt->code);

	mutex_unlock(&bridge->lock);

	return 0;
}

static void mipid02_set_fmt_source(struct v4l2_subdev *sd,
				   struct v4l2_subdev_pad_config *cfg,
				   struct v4l2_subdev_format *format)
{
	struct mipid02_dev *bridge = to_mipid02_dev(sd);

	/* source pad mirror active sink pad */
	format->format = bridge->fmt;
	/* but code may need to be converted */
	format->format.code = serial_to_parallel_code(format->format.code);

	/* only apply format for V4L2_SUBDEV_FORMAT_TRY case */
	if (format->which != V4L2_SUBDEV_FORMAT_TRY)
		return;

	*v4l2_subdev_get_try_format(sd, cfg, format->pad) = format->format;
}

static void mipid02_set_fmt_sink(struct v4l2_subdev *sd,
				 struct v4l2_subdev_pad_config *cfg,
				 struct v4l2_subdev_format *format)
{
	struct mipid02_dev *bridge = to_mipid02_dev(sd);
	struct v4l2_mbus_framefmt *fmt;

	format->format.code = get_fmt_code(format->format.code);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
	else
		fmt = &bridge->fmt;

	*fmt = format->format;
}

static int mipid02_set_fmt(struct v4l2_subdev *sd,
			   struct v4l2_subdev_pad_config *cfg,
			   struct v4l2_subdev_format *format)
{
	struct mipid02_dev *bridge = to_mipid02_dev(sd);
	struct i2c_client *client = bridge->i2c_client;
	int ret = 0;

	dev_dbg(&client->dev, "%s for %d", __func__, format->pad);

	if (format->pad >= MIPID02_PAD_NB)
		return -EINVAL;
	/* second CSI-2 pad not yet supported */
	if (format->pad == MIPID02_SINK_1)
		return -EINVAL;

	mutex_lock(&bridge->lock);

	if (bridge->streaming) {
		ret = -EBUSY;
		goto error;
	}

	if (format->pad == MIPID02_SOURCE)
		mipid02_set_fmt_source(sd, cfg, format);
	else
		mipid02_set_fmt_sink(sd, cfg, format);

error:
	mutex_unlock(&bridge->lock);

	return ret;
}

static const struct v4l2_subdev_video_ops mipid02_video_ops = {
	.s_stream = mipid02_s_stream,
};

static const struct v4l2_subdev_pad_ops mipid02_pad_ops = {
	.enum_mbus_code = mipid02_enum_mbus_code,
	.get_fmt = mipid02_get_fmt,
	.set_fmt = mipid02_set_fmt,
};

static const struct v4l2_subdev_ops mipid02_subdev_ops = {
	.video = &mipid02_video_ops,
	.pad = &mipid02_pad_ops,
};

static const struct media_entity_operations mipid02_subdev_entity_ops = {
	.link_validate = v4l2_subdev_link_validate,
};

static int mipid02_async_bound(struct v4l2_async_notifier *notifier,
			       struct v4l2_subdev *s_subdev,
			       struct v4l2_async_subdev *asd)
{
	struct mipid02_dev *bridge = to_mipid02_dev(notifier->sd);
	struct i2c_client *client = bridge->i2c_client;
	int source_pad;
	int ret;

	dev_dbg(&client->dev, "sensor_async_bound call %p", s_subdev);

	source_pad = media_entity_get_fwnode_pad(&s_subdev->entity,
						 s_subdev->fwnode,
						 MEDIA_PAD_FL_SOURCE);
	if (source_pad < 0) {
		dev_err(&client->dev, "Couldn't find output pad for subdev %s\n",
			s_subdev->name);
		return source_pad;
	}

	ret = media_create_pad_link(&s_subdev->entity, source_pad,
				    &bridge->sd.entity, 0,
				    MEDIA_LNK_FL_ENABLED |
				    MEDIA_LNK_FL_IMMUTABLE);
	if (ret) {
		dev_err(&client->dev, "Couldn't create media link %d", ret);
		return ret;
	}

	bridge->s_subdev = s_subdev;

	return 0;
}

static void mipid02_async_unbind(struct v4l2_async_notifier *notifier,
				 struct v4l2_subdev *s_subdev,
				 struct v4l2_async_subdev *asd)
{
	struct mipid02_dev *bridge = to_mipid02_dev(notifier->sd);

	bridge->s_subdev = NULL;
}

static const struct v4l2_async_notifier_operations mipid02_notifier_ops = {
	.bound		= mipid02_async_bound,
	.unbind		= mipid02_async_unbind,
};

static int mipid02_parse_rx_ep(struct mipid02_dev *bridge)
{
	struct v4l2_fwnode_endpoint ep = { .bus_type = V4L2_MBUS_CSI2_DPHY };
	struct i2c_client *client = bridge->i2c_client;
	struct device_node *ep_node;
	int ret;

	/* parse rx (endpoint 0) */
	ep_node = of_graph_get_endpoint_by_regs(bridge->i2c_client->dev.of_node,
						0, 0);
	if (!ep_node) {
		dev_err(&client->dev, "unable to find port0 ep");
		ret = -EINVAL;
		goto error;
	}

	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep_node), &ep);
	if (ret) {
		dev_err(&client->dev, "Could not parse v4l2 endpoint %d\n",
			ret);
		goto error_of_node_put;
	}

	/* do some sanity checks */
	if (ep.bus.mipi_csi2.num_data_lanes > 2) {
		dev_err(&client->dev, "max supported data lanes is 2 / got %d",
			ep.bus.mipi_csi2.num_data_lanes);
		ret = -EINVAL;
		goto error_of_node_put;
	}

	/* register it for later use */
	bridge->rx = ep;

	/* register async notifier so we get noticed when sensor is connected */
	bridge->asd.match.fwnode =
		fwnode_graph_get_remote_port_parent(of_fwnode_handle(ep_node));
	bridge->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
	of_node_put(ep_node);

	v4l2_async_notifier_init(&bridge->notifier);
	ret = v4l2_async_notifier_add_subdev(&bridge->notifier, &bridge->asd);
	if (ret) {
		dev_err(&client->dev, "fail to register asd to notifier %d",
			ret);
		fwnode_handle_put(bridge->asd.match.fwnode);
		return ret;
	}
	bridge->notifier.ops = &mipid02_notifier_ops;

	ret = v4l2_async_subdev_notifier_register(&bridge->sd,
						  &bridge->notifier);
	if (ret)
		v4l2_async_notifier_cleanup(&bridge->notifier);

	return ret;

error_of_node_put:
	of_node_put(ep_node);
error:

	return ret;
}

static int mipid02_parse_tx_ep(struct mipid02_dev *bridge)
{
	struct v4l2_fwnode_endpoint ep = { .bus_type = V4L2_MBUS_PARALLEL };
	struct i2c_client *client = bridge->i2c_client;
	struct device_node *ep_node;
	int ret;

	/* parse tx (endpoint 2) */
	ep_node = of_graph_get_endpoint_by_regs(bridge->i2c_client->dev.of_node,
						2, 0);
	if (!ep_node) {
		dev_err(&client->dev, "unable to find port1 ep");
		ret = -EINVAL;
		goto error;
	}

	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep_node), &ep);
	if (ret) {
		dev_err(&client->dev, "Could not parse v4l2 endpoint\n");
		goto error_of_node_put;
	}

	of_node_put(ep_node);
	bridge->tx = ep;

	return 0;

error_of_node_put:
	of_node_put(ep_node);
error:

	return -EINVAL;
}

static int mipid02_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct mipid02_dev *bridge;
	u32 clk_freq;
	int ret;

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

	init_format(&bridge->fmt);

	bridge->i2c_client = client;
	v4l2_i2c_subdev_init(&bridge->sd, client, &mipid02_subdev_ops);

	/* got and check clock */
	bridge->xclk = devm_clk_get(dev, "xclk");
	if (IS_ERR(bridge->xclk)) {
		dev_err(dev, "failed to get xclk\n");
		return PTR_ERR(bridge->xclk);
	}

	clk_freq = clk_get_rate(bridge->xclk);
	if (clk_freq < 6000000 || clk_freq > 27000000) {
		dev_err(dev, "xclk freq must be in 6-27 Mhz range. got %d Hz\n",
			clk_freq);
		return -EINVAL;
	}

	bridge->reset_gpio = devm_gpiod_get_optional(dev, "reset",
						     GPIOD_OUT_HIGH);

	ret = mipid02_get_regulators(bridge);
	if (ret) {
		dev_err(dev, "failed to get regulators %d", ret);
		return ret;
	}

	mutex_init(&bridge->lock);
	bridge->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	bridge->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
	bridge->sd.entity.ops = &mipid02_subdev_entity_ops;
	bridge->pad[0].flags = MEDIA_PAD_FL_SINK;
	bridge->pad[1].flags = MEDIA_PAD_FL_SINK;
	bridge->pad[2].flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_pads_init(&bridge->sd.entity, MIPID02_PAD_NB,
				     bridge->pad);
	if (ret) {
		dev_err(&client->dev, "pads init failed %d", ret);
		goto mutex_cleanup;
	}

	/* enable clock, power and reset device if available */
	ret = mipid02_set_power_on(bridge);
	if (ret)
		goto entity_cleanup;

	ret = mipid02_detect(bridge);
	if (ret) {
		dev_err(&client->dev, "failed to detect mipid02 %d", ret);
		goto power_off;
	}

	ret = mipid02_parse_tx_ep(bridge);
	if (ret) {
		dev_err(&client->dev, "failed to parse tx %d", ret);
		goto power_off;
	}

	ret = mipid02_parse_rx_ep(bridge);
	if (ret) {
		dev_err(&client->dev, "failed to parse rx %d", ret);
		goto power_off;
	}

	ret = v4l2_async_register_subdev(&bridge->sd);
	if (ret < 0) {
		dev_err(&client->dev, "v4l2_async_register_subdev failed %d",
			    ret);
		goto unregister_notifier;
	}

	dev_info(&client->dev, "mipid02 device probe successfully");

	return 0;

unregister_notifier:
	v4l2_async_notifier_unregister(&bridge->notifier);
	v4l2_async_notifier_cleanup(&bridge->notifier);
power_off:
	mipid02_set_power_off(bridge);
entity_cleanup:
	media_entity_cleanup(&bridge->sd.entity);
mutex_cleanup:
	mutex_destroy(&bridge->lock);

	return ret;
}

static int mipid02_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct mipid02_dev *bridge = to_mipid02_dev(sd);

	v4l2_async_notifier_unregister(&bridge->notifier);
	v4l2_async_notifier_cleanup(&bridge->notifier);
	v4l2_async_unregister_subdev(&bridge->sd);
	mipid02_set_power_off(bridge);
	media_entity_cleanup(&bridge->sd.entity);
	mutex_destroy(&bridge->lock);

	return 0;
}

static const struct of_device_id mipid02_dt_ids[] = {
	{ .compatible = "st,st-mipid02" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mipid02_dt_ids);

static struct i2c_driver mipid02_i2c_driver = {
	.driver = {
		.name  = "st-mipid02",
		.of_match_table = mipid02_dt_ids,
	},
	.probe_new = mipid02_probe,
	.remove = mipid02_remove,
};

module_i2c_driver(mipid02_i2c_driver);

MODULE_AUTHOR("Mickael Guene <mickael.guene@st.com>");
MODULE_DESCRIPTION("STMicroelectronics MIPID02 CSI-2 bridge driver");
MODULE_LICENSE("GPL v2");