summaryrefslogtreecommitdiff
path: root/drivers/media/i2c/video-i2c.c
blob: f15ef2d13059012efee90cc612ee6f7e5a6ed046 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * video-i2c.c - Support for I2C transport video devices
 *
 * Copyright (C) 2018 Matt Ranostay <matt.ranostay@konsulko.com>
 *
 * Supported:
 * - Panasonic AMG88xx Grid-Eye Sensors
 * - Melexis MLX90640 Thermal Cameras
 */

#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/hwmon.h>
#include <linux/kthread.h>
#include <linux/i2c.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/nvmem-provider.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>

#define VIDEO_I2C_DRIVER	"video-i2c"

/* Power control register */
#define AMG88XX_REG_PCTL	0x00
#define AMG88XX_PCTL_NORMAL		0x00
#define AMG88XX_PCTL_SLEEP		0x10

/* Reset register */
#define AMG88XX_REG_RST		0x01
#define AMG88XX_RST_FLAG		0x30
#define AMG88XX_RST_INIT		0x3f

/* Frame rate register */
#define AMG88XX_REG_FPSC	0x02
#define AMG88XX_FPSC_1FPS		BIT(0)

/* Thermistor register */
#define AMG88XX_REG_TTHL	0x0e

/* Temperature register */
#define AMG88XX_REG_T01L	0x80

/* RAM */
#define MLX90640_RAM_START_ADDR		0x0400

/* EEPROM */
#define MLX90640_EEPROM_START_ADDR	0x2400

/* Control register */
#define MLX90640_REG_CTL1		0x800d
#define MLX90640_REG_CTL1_MASK		GENMASK(9, 7)
#define MLX90640_REG_CTL1_MASK_SHIFT	7

struct video_i2c_chip;

struct video_i2c_buffer {
	struct vb2_v4l2_buffer vb;
	struct list_head list;
};

struct video_i2c_data {
	struct regmap *regmap;
	const struct video_i2c_chip *chip;
	struct mutex lock;
	spinlock_t slock;
	unsigned int sequence;
	struct mutex queue_lock;

	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	struct vb2_queue vb_vidq;

	struct task_struct *kthread_vid_cap;
	struct list_head vid_cap_active;

	struct v4l2_fract frame_interval;
};

static const struct v4l2_fmtdesc amg88xx_format = {
	.pixelformat = V4L2_PIX_FMT_Y12,
};

static const struct v4l2_frmsize_discrete amg88xx_size = {
	.width = 8,
	.height = 8,
};

static const struct v4l2_fmtdesc mlx90640_format = {
	.pixelformat = V4L2_PIX_FMT_Y16_BE,
};

static const struct v4l2_frmsize_discrete mlx90640_size = {
	.width = 32,
	.height = 26, /* 24 lines of pixel data + 2 lines of processing data */
};

static const struct regmap_config amg88xx_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0xff
};

static const struct regmap_config mlx90640_regmap_config = {
	.reg_bits = 16,
	.val_bits = 16,
};

struct video_i2c_chip {
	/* video dimensions */
	const struct v4l2_fmtdesc *format;
	const struct v4l2_frmsize_discrete *size;

	/* available frame intervals */
	const struct v4l2_fract *frame_intervals;
	unsigned int num_frame_intervals;

	/* pixel buffer size */
	unsigned int buffer_size;

	/* pixel size in bits */
	unsigned int bpp;

	const struct regmap_config *regmap_config;
	struct nvmem_config *nvmem_config;

	/* setup function */
	int (*setup)(struct video_i2c_data *data);

	/* xfer function */
	int (*xfer)(struct video_i2c_data *data, char *buf);

	/* power control function */
	int (*set_power)(struct video_i2c_data *data, bool on);

	/* hwmon init function */
	int (*hwmon_init)(struct video_i2c_data *data);
};

static int mlx90640_nvram_read(void *priv, unsigned int offset, void *val,
			     size_t bytes)
{
	struct video_i2c_data *data = priv;

	return regmap_bulk_read(data->regmap, MLX90640_EEPROM_START_ADDR + offset, val, bytes);
}

static struct nvmem_config mlx90640_nvram_config = {
	.name = "mlx90640_nvram",
	.word_size = 2,
	.stride = 1,
	.size = 1664,
	.reg_read = mlx90640_nvram_read,
};

static int amg88xx_xfer(struct video_i2c_data *data, char *buf)
{
	return regmap_bulk_read(data->regmap, AMG88XX_REG_T01L, buf,
				data->chip->buffer_size);
}

static int mlx90640_xfer(struct video_i2c_data *data, char *buf)
{
	return regmap_bulk_read(data->regmap, MLX90640_RAM_START_ADDR, buf,
				data->chip->buffer_size);
}

static int amg88xx_setup(struct video_i2c_data *data)
{
	unsigned int mask = AMG88XX_FPSC_1FPS;
	unsigned int val;

	if (data->frame_interval.numerator == data->frame_interval.denominator)
		val = mask;
	else
		val = 0;

	return regmap_update_bits(data->regmap, AMG88XX_REG_FPSC, mask, val);
}

static int mlx90640_setup(struct video_i2c_data *data)
{
	unsigned int n, idx;

	for (n = 0; n < data->chip->num_frame_intervals - 1; n++) {
		if (V4L2_FRACT_COMPARE(data->frame_interval, ==,
				       data->chip->frame_intervals[n]))
			break;
	}

	idx = data->chip->num_frame_intervals - n - 1;

	return regmap_update_bits(data->regmap, MLX90640_REG_CTL1,
				  MLX90640_REG_CTL1_MASK,
				  idx << MLX90640_REG_CTL1_MASK_SHIFT);
}

static int amg88xx_set_power_on(struct video_i2c_data *data)
{
	int ret;

	ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_NORMAL);
	if (ret)
		return ret;

	msleep(50);

	ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_INIT);
	if (ret)
		return ret;

	usleep_range(2000, 3000);

	ret = regmap_write(data->regmap, AMG88XX_REG_RST, AMG88XX_RST_FLAG);
	if (ret)
		return ret;

	/*
	 * Wait two frames before reading thermistor and temperature registers
	 */
	msleep(200);

	return 0;
}

static int amg88xx_set_power_off(struct video_i2c_data *data)
{
	int ret;

	ret = regmap_write(data->regmap, AMG88XX_REG_PCTL, AMG88XX_PCTL_SLEEP);
	if (ret)
		return ret;
	/*
	 * Wait for a while to avoid resuming normal mode immediately after
	 * entering sleep mode, otherwise the device occasionally goes wrong
	 * (thermistor and temperature registers are not updated at all)
	 */
	msleep(100);

	return 0;
}

static int amg88xx_set_power(struct video_i2c_data *data, bool on)
{
	if (on)
		return amg88xx_set_power_on(data);

	return amg88xx_set_power_off(data);
}

#if IS_REACHABLE(CONFIG_HWMON)

static const u32 amg88xx_temp_config[] = {
	HWMON_T_INPUT,
	0
};

static const struct hwmon_channel_info amg88xx_temp = {
	.type = hwmon_temp,
	.config = amg88xx_temp_config,
};

static const struct hwmon_channel_info *amg88xx_info[] = {
	&amg88xx_temp,
	NULL
};

static umode_t amg88xx_is_visible(const void *drvdata,
				  enum hwmon_sensor_types type,
				  u32 attr, int channel)
{
	return 0444;
}

static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long *val)
{
	struct video_i2c_data *data = dev_get_drvdata(dev);
	__le16 buf;
	int tmp;

	tmp = pm_runtime_resume_and_get(regmap_get_device(data->regmap));
	if (tmp < 0)
		return tmp;

	tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
	pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
	pm_runtime_put_autosuspend(regmap_get_device(data->regmap));
	if (tmp)
		return tmp;

	tmp = le16_to_cpu(buf);

	/*
	 * Check for sign bit, this isn't a two's complement value but an
	 * absolute temperature that needs to be inverted in the case of being
	 * negative.
	 */
	if (tmp & BIT(11))
		tmp = -(tmp & 0x7ff);

	*val = (tmp * 625) / 10;

	return 0;
}

static const struct hwmon_ops amg88xx_hwmon_ops = {
	.is_visible = amg88xx_is_visible,
	.read = amg88xx_read,
};

static const struct hwmon_chip_info amg88xx_chip_info = {
	.ops = &amg88xx_hwmon_ops,
	.info = amg88xx_info,
};

static int amg88xx_hwmon_init(struct video_i2c_data *data)
{
	struct device *dev = regmap_get_device(data->regmap);
	void *hwmon = devm_hwmon_device_register_with_info(dev, "amg88xx", data,
						&amg88xx_chip_info, NULL);

	return PTR_ERR_OR_ZERO(hwmon);
}
#else
#define	amg88xx_hwmon_init	NULL
#endif

enum {
	AMG88XX,
	MLX90640,
};

static const struct v4l2_fract amg88xx_frame_intervals[] = {
	{ 1, 10 },
	{ 1, 1 },
};

static const struct v4l2_fract mlx90640_frame_intervals[] = {
	{ 1, 64 },
	{ 1, 32 },
	{ 1, 16 },
	{ 1, 8 },
	{ 1, 4 },
	{ 1, 2 },
	{ 1, 1 },
	{ 2, 1 },
};

static const struct video_i2c_chip video_i2c_chip[] = {
	[AMG88XX] = {
		.size		= &amg88xx_size,
		.format		= &amg88xx_format,
		.frame_intervals	= amg88xx_frame_intervals,
		.num_frame_intervals	= ARRAY_SIZE(amg88xx_frame_intervals),
		.buffer_size	= 128,
		.bpp		= 16,
		.regmap_config	= &amg88xx_regmap_config,
		.setup		= &amg88xx_setup,
		.xfer		= &amg88xx_xfer,
		.set_power	= amg88xx_set_power,
		.hwmon_init	= amg88xx_hwmon_init,
	},
	[MLX90640] = {
		.size		= &mlx90640_size,
		.format		= &mlx90640_format,
		.frame_intervals	= mlx90640_frame_intervals,
		.num_frame_intervals	= ARRAY_SIZE(mlx90640_frame_intervals),
		.buffer_size	= 1664,
		.bpp		= 16,
		.regmap_config	= &mlx90640_regmap_config,
		.nvmem_config	= &mlx90640_nvram_config,
		.setup		= mlx90640_setup,
		.xfer		= mlx90640_xfer,
	},
};

static const struct v4l2_file_operations video_i2c_fops = {
	.owner		= THIS_MODULE,
	.open		= v4l2_fh_open,
	.release	= vb2_fop_release,
	.poll		= vb2_fop_poll,
	.read		= vb2_fop_read,
	.mmap		= vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
};

static int queue_setup(struct vb2_queue *vq,
		       unsigned int *nbuffers, unsigned int *nplanes,
		       unsigned int sizes[], struct device *alloc_devs[])
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);
	unsigned int size = data->chip->buffer_size;

	if (vq->num_buffers + *nbuffers < 2)
		*nbuffers = 2;

	if (*nplanes)
		return sizes[0] < size ? -EINVAL : 0;

	*nplanes = 1;
	sizes[0] = size;

	return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
	unsigned int size = data->chip->buffer_size;

	if (vb2_plane_size(vb, 0) < size)
		return -EINVAL;

	vbuf->field = V4L2_FIELD_NONE;
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct video_i2c_data *data = vb2_get_drv_priv(vb->vb2_queue);
	struct video_i2c_buffer *buf =
			container_of(vbuf, struct video_i2c_buffer, vb);

	spin_lock(&data->slock);
	list_add_tail(&buf->list, &data->vid_cap_active);
	spin_unlock(&data->slock);
}

static int video_i2c_thread_vid_cap(void *priv)
{
	struct video_i2c_data *data = priv;
	u32 delay = mult_frac(1000000UL, data->frame_interval.numerator,
			       data->frame_interval.denominator);
	s64 end_us = ktime_to_us(ktime_get());

	set_freezable();

	do {
		struct video_i2c_buffer *vid_cap_buf = NULL;
		s64 current_us;
		int schedule_delay;

		try_to_freeze();

		spin_lock(&data->slock);

		if (!list_empty(&data->vid_cap_active)) {
			vid_cap_buf = list_last_entry(&data->vid_cap_active,
						 struct video_i2c_buffer, list);
			list_del(&vid_cap_buf->list);
		}

		spin_unlock(&data->slock);

		if (vid_cap_buf) {
			struct vb2_buffer *vb2_buf = &vid_cap_buf->vb.vb2_buf;
			void *vbuf = vb2_plane_vaddr(vb2_buf, 0);
			int ret;

			ret = data->chip->xfer(data, vbuf);
			vb2_buf->timestamp = ktime_get_ns();
			vid_cap_buf->vb.sequence = data->sequence++;
			vb2_buffer_done(vb2_buf, ret ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
		}

		end_us += delay;
		current_us = ktime_to_us(ktime_get());
		if (current_us < end_us) {
			schedule_delay = end_us - current_us;
			usleep_range(schedule_delay * 3 / 4, schedule_delay);
		} else {
			end_us = current_us;
		}
	} while (!kthread_should_stop());

	return 0;
}

static void video_i2c_del_list(struct vb2_queue *vq, enum vb2_buffer_state state)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);
	struct video_i2c_buffer *buf, *tmp;

	spin_lock(&data->slock);

	list_for_each_entry_safe(buf, tmp, &data->vid_cap_active, list) {
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, state);
	}

	spin_unlock(&data->slock);
}

static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);
	struct device *dev = regmap_get_device(data->regmap);
	int ret;

	if (data->kthread_vid_cap)
		return 0;

	ret = pm_runtime_resume_and_get(dev);
	if (ret < 0)
		goto error_del_list;

	ret = data->chip->setup(data);
	if (ret)
		goto error_rpm_put;

	data->sequence = 0;
	data->kthread_vid_cap = kthread_run(video_i2c_thread_vid_cap, data,
					    "%s-vid-cap", data->v4l2_dev.name);
	ret = PTR_ERR_OR_ZERO(data->kthread_vid_cap);
	if (!ret)
		return 0;

error_rpm_put:
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
error_del_list:
	video_i2c_del_list(vq, VB2_BUF_STATE_QUEUED);

	return ret;
}

static void stop_streaming(struct vb2_queue *vq)
{
	struct video_i2c_data *data = vb2_get_drv_priv(vq);

	if (data->kthread_vid_cap == NULL)
		return;

	kthread_stop(data->kthread_vid_cap);
	data->kthread_vid_cap = NULL;
	pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
	pm_runtime_put_autosuspend(regmap_get_device(data->regmap));

	video_i2c_del_list(vq, VB2_BUF_STATE_ERROR);
}

static const struct vb2_ops video_i2c_video_qops = {
	.queue_setup		= queue_setup,
	.buf_prepare		= buffer_prepare,
	.buf_queue		= buffer_queue,
	.start_streaming	= start_streaming,
	.stop_streaming		= stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

static int video_i2c_querycap(struct file *file, void  *priv,
				struct v4l2_capability *vcap)
{
	struct video_i2c_data *data = video_drvdata(file);
	struct device *dev = regmap_get_device(data->regmap);
	struct i2c_client *client = to_i2c_client(dev);

	strscpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver));
	strscpy(vcap->card, data->vdev.name, sizeof(vcap->card));

	sprintf(vcap->bus_info, "I2C:%d-%d", client->adapter->nr, client->addr);

	return 0;
}

static int video_i2c_g_input(struct file *file, void *fh, unsigned int *inp)
{
	*inp = 0;

	return 0;
}

static int video_i2c_s_input(struct file *file, void *fh, unsigned int inp)
{
	return (inp > 0) ? -EINVAL : 0;
}

static int video_i2c_enum_input(struct file *file, void *fh,
				  struct v4l2_input *vin)
{
	if (vin->index > 0)
		return -EINVAL;

	strscpy(vin->name, "Camera", sizeof(vin->name));

	vin->type = V4L2_INPUT_TYPE_CAMERA;

	return 0;
}

static int video_i2c_enum_fmt_vid_cap(struct file *file, void *fh,
					struct v4l2_fmtdesc *fmt)
{
	struct video_i2c_data *data = video_drvdata(file);
	enum v4l2_buf_type type = fmt->type;

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

	*fmt = *data->chip->format;
	fmt->type = type;

	return 0;
}

static int video_i2c_enum_framesizes(struct file *file, void *fh,
				       struct v4l2_frmsizeenum *fsize)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;

	/* currently only one frame size is allowed */
	if (fsize->index > 0)
		return -EINVAL;

	if (fsize->pixel_format != data->chip->format->pixelformat)
		return -EINVAL;

	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
	fsize->discrete.width = size->width;
	fsize->discrete.height = size->height;

	return 0;
}

static int video_i2c_enum_frameintervals(struct file *file, void *priv,
					   struct v4l2_frmivalenum *fe)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;

	if (fe->index >= data->chip->num_frame_intervals)
		return -EINVAL;

	if (fe->width != size->width || fe->height != size->height)
		return -EINVAL;

	fe->type = V4L2_FRMIVAL_TYPE_DISCRETE;
	fe->discrete = data->chip->frame_intervals[fe->index];

	return 0;
}

static int video_i2c_try_fmt_vid_cap(struct file *file, void *fh,
				       struct v4l2_format *fmt)
{
	const struct video_i2c_data *data = video_drvdata(file);
	const struct v4l2_frmsize_discrete *size = data->chip->size;
	struct v4l2_pix_format *pix = &fmt->fmt.pix;
	unsigned int bpp = data->chip->bpp / 8;

	pix->width = size->width;
	pix->height = size->height;
	pix->pixelformat = data->chip->format->pixelformat;
	pix->field = V4L2_FIELD_NONE;
	pix->bytesperline = pix->width * bpp;
	pix->sizeimage = pix->bytesperline * pix->height;
	pix->colorspace = V4L2_COLORSPACE_RAW;

	return 0;
}

static int video_i2c_s_fmt_vid_cap(struct file *file, void *fh,
				     struct v4l2_format *fmt)
{
	struct video_i2c_data *data = video_drvdata(file);

	if (vb2_is_busy(&data->vb_vidq))
		return -EBUSY;

	return video_i2c_try_fmt_vid_cap(file, fh, fmt);
}

static int video_i2c_g_parm(struct file *filp, void *priv,
			      struct v4l2_streamparm *parm)
{
	struct video_i2c_data *data = video_drvdata(filp);

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

	parm->parm.capture.readbuffers = 1;
	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
	parm->parm.capture.timeperframe = data->frame_interval;

	return 0;
}

static int video_i2c_s_parm(struct file *filp, void *priv,
			      struct v4l2_streamparm *parm)
{
	struct video_i2c_data *data = video_drvdata(filp);
	int i;

	for (i = 0; i < data->chip->num_frame_intervals - 1; i++) {
		if (V4L2_FRACT_COMPARE(parm->parm.capture.timeperframe, <=,
				       data->chip->frame_intervals[i]))
			break;
	}
	data->frame_interval = data->chip->frame_intervals[i];

	return video_i2c_g_parm(filp, priv, parm);
}

static const struct v4l2_ioctl_ops video_i2c_ioctl_ops = {
	.vidioc_querycap		= video_i2c_querycap,
	.vidioc_g_input			= video_i2c_g_input,
	.vidioc_s_input			= video_i2c_s_input,
	.vidioc_enum_input		= video_i2c_enum_input,
	.vidioc_enum_fmt_vid_cap	= video_i2c_enum_fmt_vid_cap,
	.vidioc_enum_framesizes		= video_i2c_enum_framesizes,
	.vidioc_enum_frameintervals	= video_i2c_enum_frameintervals,
	.vidioc_g_fmt_vid_cap		= video_i2c_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		= video_i2c_s_fmt_vid_cap,
	.vidioc_g_parm			= video_i2c_g_parm,
	.vidioc_s_parm			= video_i2c_s_parm,
	.vidioc_try_fmt_vid_cap		= video_i2c_try_fmt_vid_cap,
	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,
};

static void video_i2c_release(struct video_device *vdev)
{
	struct video_i2c_data *data = video_get_drvdata(vdev);

	v4l2_device_unregister(&data->v4l2_dev);
	mutex_destroy(&data->lock);
	mutex_destroy(&data->queue_lock);
	regmap_exit(data->regmap);
	kfree(data);
}

static int video_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct video_i2c_data *data;
	struct v4l2_device *v4l2_dev;
	struct vb2_queue *queue;
	int ret = -ENODEV;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	if (dev_fwnode(&client->dev))
		data->chip = device_get_match_data(&client->dev);
	else if (id)
		data->chip = &video_i2c_chip[id->driver_data];
	else
		goto error_free_device;

	data->regmap = regmap_init_i2c(client, data->chip->regmap_config);
	if (IS_ERR(data->regmap)) {
		ret = PTR_ERR(data->regmap);
		goto error_free_device;
	}

	v4l2_dev = &data->v4l2_dev;
	strscpy(v4l2_dev->name, VIDEO_I2C_DRIVER, sizeof(v4l2_dev->name));

	ret = v4l2_device_register(&client->dev, v4l2_dev);
	if (ret < 0)
		goto error_regmap_exit;

	mutex_init(&data->lock);
	mutex_init(&data->queue_lock);

	queue = &data->vb_vidq;
	queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	queue->io_modes = VB2_DMABUF | VB2_MMAP | VB2_USERPTR | VB2_READ;
	queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	queue->drv_priv = data;
	queue->buf_struct_size = sizeof(struct video_i2c_buffer);
	queue->min_buffers_needed = 1;
	queue->ops = &video_i2c_video_qops;
	queue->mem_ops = &vb2_vmalloc_memops;

	ret = vb2_queue_init(queue);
	if (ret < 0)
		goto error_unregister_device;

	data->vdev.queue = queue;
	data->vdev.queue->lock = &data->queue_lock;

	snprintf(data->vdev.name, sizeof(data->vdev.name),
				 "I2C %d-%d Transport Video",
				 client->adapter->nr, client->addr);

	data->vdev.v4l2_dev = v4l2_dev;
	data->vdev.fops = &video_i2c_fops;
	data->vdev.lock = &data->lock;
	data->vdev.ioctl_ops = &video_i2c_ioctl_ops;
	data->vdev.release = video_i2c_release;
	data->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE |
				 V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;

	spin_lock_init(&data->slock);
	INIT_LIST_HEAD(&data->vid_cap_active);

	data->frame_interval = data->chip->frame_intervals[0];

	video_set_drvdata(&data->vdev, data);
	i2c_set_clientdata(client, data);

	if (data->chip->set_power) {
		ret = data->chip->set_power(data, true);
		if (ret)
			goto error_unregister_device;
	}

	pm_runtime_get_noresume(&client->dev);
	pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev, 2000);
	pm_runtime_use_autosuspend(&client->dev);

	if (data->chip->hwmon_init) {
		ret = data->chip->hwmon_init(data);
		if (ret < 0) {
			dev_warn(&client->dev,
				 "failed to register hwmon device\n");
		}
	}

	if (data->chip->nvmem_config) {
		struct nvmem_config *config = data->chip->nvmem_config;
		struct nvmem_device *device;

		config->priv = data;
		config->dev = &client->dev;

		device = devm_nvmem_register(&client->dev, config);

		if (IS_ERR(device)) {
			dev_warn(&client->dev,
				 "failed to register nvmem device\n");
		}
	}

	ret = video_register_device(&data->vdev, VFL_TYPE_VIDEO, -1);
	if (ret < 0)
		goto error_pm_disable;

	pm_runtime_mark_last_busy(&client->dev);
	pm_runtime_put_autosuspend(&client->dev);

	return 0;

error_pm_disable:
	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
	pm_runtime_put_noidle(&client->dev);

	if (data->chip->set_power)
		data->chip->set_power(data, false);

error_unregister_device:
	v4l2_device_unregister(v4l2_dev);
	mutex_destroy(&data->lock);
	mutex_destroy(&data->queue_lock);

error_regmap_exit:
	regmap_exit(data->regmap);

error_free_device:
	kfree(data);

	return ret;
}

static void video_i2c_remove(struct i2c_client *client)
{
	struct video_i2c_data *data = i2c_get_clientdata(client);

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

	if (data->chip->set_power)
		data->chip->set_power(data, false);

	video_unregister_device(&data->vdev);
}

#ifdef CONFIG_PM

static int video_i2c_pm_runtime_suspend(struct device *dev)
{
	struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));

	if (!data->chip->set_power)
		return 0;

	return data->chip->set_power(data, false);
}

static int video_i2c_pm_runtime_resume(struct device *dev)
{
	struct video_i2c_data *data = i2c_get_clientdata(to_i2c_client(dev));

	if (!data->chip->set_power)
		return 0;

	return data->chip->set_power(data, true);
}

#endif

static const struct dev_pm_ops video_i2c_pm_ops = {
	SET_RUNTIME_PM_OPS(video_i2c_pm_runtime_suspend,
			   video_i2c_pm_runtime_resume, NULL)
};

static const struct i2c_device_id video_i2c_id_table[] = {
	{ "amg88xx", AMG88XX },
	{ "mlx90640", MLX90640 },
	{}
};
MODULE_DEVICE_TABLE(i2c, video_i2c_id_table);

static const struct of_device_id video_i2c_of_match[] = {
	{ .compatible = "panasonic,amg88xx", .data = &video_i2c_chip[AMG88XX] },
	{ .compatible = "melexis,mlx90640", .data = &video_i2c_chip[MLX90640] },
	{}
};
MODULE_DEVICE_TABLE(of, video_i2c_of_match);

static struct i2c_driver video_i2c_driver = {
	.driver = {
		.name	= VIDEO_I2C_DRIVER,
		.of_match_table = video_i2c_of_match,
		.pm	= &video_i2c_pm_ops,
	},
	.probe		= video_i2c_probe,
	.remove		= video_i2c_remove,
	.id_table	= video_i2c_id_table,
};

module_i2c_driver(video_i2c_driver);

MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
MODULE_DESCRIPTION("I2C transport video support");
MODULE_LICENSE("GPL v2");