aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/mt9m032.c
blob: 7636672c3548a45fc1b76dc502d099b34c472533 (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
/*
 * Driver for MT9M032 CMOS Image Sensor from Micron
 *
 * Copyright (C) 2010-2011 Lund Engineering
 * Contact: Gil Lund <gwlund@lundeng.com>
 * Author: Martin Hostettler <martin@neutronstar.dyndns.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/v4l2-mediabus.h>

#include <media/media-entity.h>
#include <media/mt9m032.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>

#include "aptina-pll.h"

/*
 * width and height include active boundary and black parts
 *
 * column    0-  15 active boundary
 * column   16-1455 image
 * column 1456-1471 active boundary
 * column 1472-1599 black
 *
 * row       0-  51 black
 * row      53-  59 active boundary
 * row      60-1139 image
 * row    1140-1147 active boundary
 * row    1148-1151 black
 */

#define MT9M032_PIXEL_ARRAY_WIDTH			1600
#define MT9M032_PIXEL_ARRAY_HEIGHT			1152

#define MT9M032_CHIP_VERSION				0x00
#define		MT9M032_CHIP_VERSION_VALUE		0x1402
#define MT9M032_ROW_START				0x01
#define		MT9M032_ROW_START_MIN			0
#define		MT9M032_ROW_START_MAX			1152
#define		MT9M032_ROW_START_DEF			60
#define MT9M032_COLUMN_START				0x02
#define		MT9M032_COLUMN_START_MIN		0
#define		MT9M032_COLUMN_START_MAX		1600
#define		MT9M032_COLUMN_START_DEF		16
#define MT9M032_ROW_SIZE				0x03
#define		MT9M032_ROW_SIZE_MIN			32
#define		MT9M032_ROW_SIZE_MAX			1152
#define		MT9M032_ROW_SIZE_DEF			1080
#define MT9M032_COLUMN_SIZE				0x04
#define		MT9M032_COLUMN_SIZE_MIN			32
#define		MT9M032_COLUMN_SIZE_MAX			1600
#define		MT9M032_COLUMN_SIZE_DEF			1440
#define MT9M032_HBLANK					0x05
#define MT9M032_VBLANK					0x06
#define		MT9M032_VBLANK_MAX			0x7ff
#define MT9M032_SHUTTER_WIDTH_HIGH			0x08
#define MT9M032_SHUTTER_WIDTH_LOW			0x09
#define		MT9M032_SHUTTER_WIDTH_MIN		1
#define		MT9M032_SHUTTER_WIDTH_MAX		1048575
#define		MT9M032_SHUTTER_WIDTH_DEF		1943
#define MT9M032_PIX_CLK_CTRL				0x0a
#define		MT9M032_PIX_CLK_CTRL_INV_PIXCLK		0x8000
#define MT9M032_RESTART					0x0b
#define MT9M032_RESET					0x0d
#define MT9M032_PLL_CONFIG1				0x11
#define		MT9M032_PLL_CONFIG1_OUTDIV_MASK		0x3f
#define		MT9M032_PLL_CONFIG1_MUL_SHIFT		8
#define MT9M032_READ_MODE1				0x1e
#define MT9M032_READ_MODE2				0x20
#define		MT9M032_READ_MODE2_VFLIP_SHIFT		15
#define		MT9M032_READ_MODE2_HFLIP_SHIFT		14
#define		MT9M032_READ_MODE2_ROW_BLC		0x40
#define MT9M032_GAIN_GREEN1				0x2b
#define MT9M032_GAIN_BLUE				0x2c
#define MT9M032_GAIN_RED				0x2d
#define MT9M032_GAIN_GREEN2				0x2e

/* write only */
#define MT9M032_GAIN_ALL				0x35
#define		MT9M032_GAIN_DIGITAL_MASK		0x7f
#define		MT9M032_GAIN_DIGITAL_SHIFT		8
#define		MT9M032_GAIN_AMUL_SHIFT			6
#define		MT9M032_GAIN_ANALOG_MASK		0x3f
#define MT9M032_FORMATTER1				0x9e
#define MT9M032_FORMATTER2				0x9f
#define		MT9M032_FORMATTER2_DOUT_EN		0x1000
#define		MT9M032_FORMATTER2_PIXCLK_EN		0x2000

/*
 * The available MT9M032 datasheet is missing documentation for register 0x10
 * MT9P031 seems to be close enough, so use constants from that datasheet for
 * now.
 * But keep the name MT9P031 to remind us, that this isn't really confirmed
 * for this sensor.
 */
#define MT9P031_PLL_CONTROL				0x10
#define		MT9P031_PLL_CONTROL_PWROFF		0x0050
#define		MT9P031_PLL_CONTROL_PWRON		0x0051
#define		MT9P031_PLL_CONTROL_USEPLL		0x0052
#define MT9P031_PLL_CONFIG2				0x11
#define		MT9P031_PLL_CONFIG2_P1_DIV_MASK		0x1f

struct mt9m032 {
	struct v4l2_subdev subdev;
	struct media_pad pad;
	struct mt9m032_platform_data *pdata;

	unsigned int pix_clock;

	struct v4l2_ctrl_handler ctrls;
	struct {
		struct v4l2_ctrl *hflip;
		struct v4l2_ctrl *vflip;
	};

	struct mutex lock; /* Protects streaming, format, interval and crop */

	bool streaming;

	struct v4l2_mbus_framefmt format;
	struct v4l2_rect crop;
	struct v4l2_fract frame_interval;
};

#define to_mt9m032(sd)	container_of(sd, struct mt9m032, subdev)
#define to_dev(sensor) \
	(&((struct i2c_client *)v4l2_get_subdevdata(&(sensor)->subdev))->dev)

static int mt9m032_read(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_word_swapped(client, reg);
}

static int mt9m032_write(struct i2c_client *client, u8 reg, const u16 data)
{
	return i2c_smbus_write_word_swapped(client, reg, data);
}

static u32 mt9m032_row_time(struct mt9m032 *sensor, unsigned int width)
{
	unsigned int effective_width;
	u32 ns;

	effective_width = width + 716; /* empirical value */
	ns = div_u64(1000000000ULL * effective_width, sensor->pix_clock);
	dev_dbg(to_dev(sensor),	"MT9M032 line time: %u ns\n", ns);
	return ns;
}

static int mt9m032_update_timing(struct mt9m032 *sensor,
				 struct v4l2_fract *interval)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	struct v4l2_rect *crop = &sensor->crop;
	unsigned int min_vblank;
	unsigned int vblank;
	u32 row_time;

	if (!interval)
		interval = &sensor->frame_interval;

	row_time = mt9m032_row_time(sensor, crop->width);

	vblank = div_u64(1000000000ULL * interval->numerator,
			 (u64)row_time * interval->denominator)
	       - crop->height;

	if (vblank > MT9M032_VBLANK_MAX) {
		/* hardware limits to 11 bit values */
		interval->denominator = 1000;
		interval->numerator =
			div_u64((crop->height + MT9M032_VBLANK_MAX) *
				(u64)row_time * interval->denominator,
				1000000000ULL);
		vblank = div_u64(1000000000ULL * interval->numerator,
				 (u64)row_time * interval->denominator)
		       - crop->height;
	}
	/* enforce minimal 1.6ms blanking time. */
	min_vblank = 1600000 / row_time;
	vblank = clamp_t(unsigned int, vblank, min_vblank, MT9M032_VBLANK_MAX);

	return mt9m032_write(client, MT9M032_VBLANK, vblank);
}

static int mt9m032_update_geom_timing(struct mt9m032 *sensor)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	int ret;

	ret = mt9m032_write(client, MT9M032_COLUMN_SIZE,
			    sensor->crop.width - 1);
	if (!ret)
		ret = mt9m032_write(client, MT9M032_ROW_SIZE,
				    sensor->crop.height - 1);
	if (!ret)
		ret = mt9m032_write(client, MT9M032_COLUMN_START,
				    sensor->crop.left);
	if (!ret)
		ret = mt9m032_write(client, MT9M032_ROW_START,
				    sensor->crop.top);
	if (!ret)
		ret = mt9m032_update_timing(sensor, NULL);
	return ret;
}

static int update_formatter2(struct mt9m032 *sensor, bool streaming)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	u16 reg_val =   MT9M032_FORMATTER2_DOUT_EN
		      | 0x0070;  /* parts reserved! */
				 /* possibly for changing to 14-bit mode */

	if (streaming)
		reg_val |= MT9M032_FORMATTER2_PIXCLK_EN;   /* pixclock enable */

	return mt9m032_write(client, MT9M032_FORMATTER2, reg_val);
}

static int mt9m032_setup_pll(struct mt9m032 *sensor)
{
	static const struct aptina_pll_limits limits = {
		.ext_clock_min = 8000000,
		.ext_clock_max = 16500000,
		.int_clock_min = 2000000,
		.int_clock_max = 24000000,
		.out_clock_min = 322000000,
		.out_clock_max = 693000000,
		.pix_clock_max = 99000000,
		.n_min = 1,
		.n_max = 64,
		.m_min = 16,
		.m_max = 255,
		.p1_min = 1,
		.p1_max = 128,
	};

	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	struct mt9m032_platform_data *pdata = sensor->pdata;
	struct aptina_pll pll;
	int ret;

	pll.ext_clock = pdata->ext_clock;
	pll.pix_clock = pdata->pix_clock;

	ret = aptina_pll_calculate(&client->dev, &limits, &pll);
	if (ret < 0)
		return ret;

	sensor->pix_clock = pdata->pix_clock;

	ret = mt9m032_write(client, MT9M032_PLL_CONFIG1,
			    (pll.m << MT9M032_PLL_CONFIG1_MUL_SHIFT)
			    | (pll.p1 - 1));
	if (!ret)
		ret = mt9m032_write(client, MT9P031_PLL_CONFIG2, pll.n - 1);
	if (!ret)
		ret = mt9m032_write(client, MT9P031_PLL_CONTROL,
				    MT9P031_PLL_CONTROL_PWRON |
				    MT9P031_PLL_CONTROL_USEPLL);
	if (!ret)		/* more reserved, Continuous, Master Mode */
		ret = mt9m032_write(client, MT9M032_READ_MODE1, 0x8006);
	if (!ret)		/* Set 14-bit mode, select 7 divider */
		ret = mt9m032_write(client, MT9M032_FORMATTER1, 0x111e);

	return ret;
}

/* -----------------------------------------------------------------------------
 * Subdev pad operations
 */

static int mt9m032_enum_mbus_code(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_fh *fh,
				  struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index != 0)
		return -EINVAL;

	code->code = V4L2_MBUS_FMT_Y8_1X8;
	return 0;
}

static int mt9m032_enum_frame_size(struct v4l2_subdev *subdev,
				   struct v4l2_subdev_fh *fh,
				   struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->index != 0 || fse->code != V4L2_MBUS_FMT_Y8_1X8)
		return -EINVAL;

	fse->min_width = MT9M032_COLUMN_SIZE_DEF;
	fse->max_width = MT9M032_COLUMN_SIZE_DEF;
	fse->min_height = MT9M032_ROW_SIZE_DEF;
	fse->max_height = MT9M032_ROW_SIZE_DEF;

	return 0;
}

/**
 * __mt9m032_get_pad_crop() - get crop rect
 * @sensor: pointer to the sensor struct
 * @fh: file handle for getting the try crop rect from
 * @which: select try or active crop rect
 *
 * Returns a pointer the current active or fh relative try crop rect
 */
static struct v4l2_rect *
__mt9m032_get_pad_crop(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh,
		       enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_crop(fh, 0);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &sensor->crop;
	default:
		return NULL;
	}
}

/**
 * __mt9m032_get_pad_format() - get format
 * @sensor: pointer to the sensor struct
 * @fh: file handle for getting the try format from
 * @which: select try or active format
 *
 * Returns a pointer the current active or fh relative try format
 */
static struct v4l2_mbus_framefmt *
__mt9m032_get_pad_format(struct mt9m032 *sensor, struct v4l2_subdev_fh *fh,
			 enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(fh, 0);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &sensor->format;
	default:
		return NULL;
	}
}

static int mt9m032_get_pad_format(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_fh *fh,
				  struct v4l2_subdev_format *fmt)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);

	mutex_lock(&sensor->lock);
	fmt->format = *__mt9m032_get_pad_format(sensor, fh, fmt->which);
	mutex_unlock(&sensor->lock);

	return 0;
}

static int mt9m032_set_pad_format(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_fh *fh,
				  struct v4l2_subdev_format *fmt)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);
	int ret;

	mutex_lock(&sensor->lock);

	if (sensor->streaming && fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
		ret = -EBUSY;
		goto done;
	}

	/* Scaling is not supported, the format is thus fixed. */
	ret = mt9m032_get_pad_format(subdev, fh, fmt);

done:
	mutex_lock(&sensor->lock);
	return ret;
}

static int mt9m032_get_pad_crop(struct v4l2_subdev *subdev,
				struct v4l2_subdev_fh *fh,
				struct v4l2_subdev_crop *crop)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);

	mutex_lock(&sensor->lock);
	crop->rect = *__mt9m032_get_pad_crop(sensor, fh, crop->which);
	mutex_unlock(&sensor->lock);

	return 0;
}

static int mt9m032_set_pad_crop(struct v4l2_subdev *subdev,
				struct v4l2_subdev_fh *fh,
				struct v4l2_subdev_crop *crop)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);
	struct v4l2_mbus_framefmt *format;
	struct v4l2_rect *__crop;
	struct v4l2_rect rect;
	int ret = 0;

	mutex_lock(&sensor->lock);

	if (sensor->streaming && crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
		ret = -EBUSY;
		goto done;
	}

	/* Clamp the crop rectangle boundaries and align them to a multiple of 2
	 * pixels to ensure a GRBG Bayer pattern.
	 */
	rect.left = clamp(ALIGN(crop->rect.left, 2), MT9M032_COLUMN_START_MIN,
			  MT9M032_COLUMN_START_MAX);
	rect.top = clamp(ALIGN(crop->rect.top, 2), MT9M032_ROW_START_MIN,
			 MT9M032_ROW_START_MAX);
	rect.width = clamp(ALIGN(crop->rect.width, 2), MT9M032_COLUMN_SIZE_MIN,
			   MT9M032_COLUMN_SIZE_MAX);
	rect.height = clamp(ALIGN(crop->rect.height, 2), MT9M032_ROW_SIZE_MIN,
			    MT9M032_ROW_SIZE_MAX);

	rect.width = min(rect.width, MT9M032_PIXEL_ARRAY_WIDTH - rect.left);
	rect.height = min(rect.height, MT9M032_PIXEL_ARRAY_HEIGHT - rect.top);

	__crop = __mt9m032_get_pad_crop(sensor, fh, crop->which);

	if (rect.width != __crop->width || rect.height != __crop->height) {
		/* Reset the output image size if the crop rectangle size has
		 * been modified.
		 */
		format = __mt9m032_get_pad_format(sensor, fh, crop->which);
		format->width = rect.width;
		format->height = rect.height;
	}

	*__crop = rect;
	crop->rect = rect;

	if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE)
		ret = mt9m032_update_geom_timing(sensor);

done:
	mutex_unlock(&sensor->lock);
	return ret;
}

static int mt9m032_get_frame_interval(struct v4l2_subdev *subdev,
				      struct v4l2_subdev_frame_interval *fi)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);

	mutex_lock(&sensor->lock);
	memset(fi, 0, sizeof(*fi));
	fi->interval = sensor->frame_interval;
	mutex_unlock(&sensor->lock);

	return 0;
}

static int mt9m032_set_frame_interval(struct v4l2_subdev *subdev,
				      struct v4l2_subdev_frame_interval *fi)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);
	int ret;

	mutex_lock(&sensor->lock);

	if (sensor->streaming) {
		ret = -EBUSY;
		goto done;
	}

	/* Avoid divisions by 0. */
	if (fi->interval.denominator == 0)
		fi->interval.denominator = 1;

	ret = mt9m032_update_timing(sensor, &fi->interval);
	if (!ret)
		sensor->frame_interval = fi->interval;

done:
	mutex_unlock(&sensor->lock);
	return ret;
}

static int mt9m032_s_stream(struct v4l2_subdev *subdev, int streaming)
{
	struct mt9m032 *sensor = to_mt9m032(subdev);
	int ret;

	mutex_lock(&sensor->lock);
	ret = update_formatter2(sensor, streaming);
	if (!ret)
		sensor->streaming = streaming;
	mutex_unlock(&sensor->lock);

	return ret;
}

/* -----------------------------------------------------------------------------
 * V4L2 subdev core operations
 */

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m032_g_register(struct v4l2_subdev *sd,
			      struct v4l2_dbg_register *reg)
{
	struct mt9m032 *sensor = to_mt9m032(sd);
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	int val;

	if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
		return -EINVAL;
	if (reg->match.addr != client->addr)
		return -ENODEV;

	val = mt9m032_read(client, reg->reg);
	if (val < 0)
		return -EIO;

	reg->size = 2;
	reg->val = val;

	return 0;
}

static int mt9m032_s_register(struct v4l2_subdev *sd,
			      struct v4l2_dbg_register *reg)
{
	struct mt9m032 *sensor = to_mt9m032(sd);
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);

	if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
		return -EINVAL;

	if (reg->match.addr != client->addr)
		return -ENODEV;

	return mt9m032_write(client, reg->reg, reg->val);
}
#endif

/* -----------------------------------------------------------------------------
 * V4L2 subdev control operations
 */

static int update_read_mode2(struct mt9m032 *sensor, bool vflip, bool hflip)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	int reg_val = (vflip << MT9M032_READ_MODE2_VFLIP_SHIFT)
		    | (hflip << MT9M032_READ_MODE2_HFLIP_SHIFT)
		    | MT9M032_READ_MODE2_ROW_BLC
		    | 0x0007;

	return mt9m032_write(client, MT9M032_READ_MODE2, reg_val);
}

static int mt9m032_set_gain(struct mt9m032 *sensor, s32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	int digital_gain_val;	/* in 1/8th (0..127) */
	int analog_mul;		/* 0 or 1 */
	int analog_gain_val;	/* in 1/16th. (0..63) */
	u16 reg_val;

	digital_gain_val = 51; /* from setup example */

	if (val < 63) {
		analog_mul = 0;
		analog_gain_val = val;
	} else {
		analog_mul = 1;
		analog_gain_val = val / 2;
	}

	/* a_gain = (1 + analog_mul) + (analog_gain_val + 1) / 16 */
	/* overall_gain = a_gain * (1 + digital_gain_val / 8) */

	reg_val = ((digital_gain_val & MT9M032_GAIN_DIGITAL_MASK)
		   << MT9M032_GAIN_DIGITAL_SHIFT)
		| ((analog_mul & 1) << MT9M032_GAIN_AMUL_SHIFT)
		| (analog_gain_val & MT9M032_GAIN_ANALOG_MASK);

	return mt9m032_write(client, MT9M032_GAIN_ALL, reg_val);
}

static int mt9m032_try_ctrl(struct v4l2_ctrl *ctrl)
{
	if (ctrl->id == V4L2_CID_GAIN && ctrl->val >= 63) {
		/* round because of multiplier used for values >= 63 */
		ctrl->val &= ~1;
	}

	return 0;
}

static int mt9m032_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct mt9m032 *sensor =
		container_of(ctrl->handler, struct mt9m032, ctrls);
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->subdev);
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_GAIN:
		return mt9m032_set_gain(sensor, ctrl->val);

	case V4L2_CID_HFLIP:
	/* case V4L2_CID_VFLIP: -- In the same cluster */
		return update_read_mode2(sensor, sensor->vflip->val,
					 sensor->hflip->val);

	case V4L2_CID_EXPOSURE:
		ret = mt9m032_write(client, MT9M032_SHUTTER_WIDTH_HIGH,
				    (ctrl->val >> 16) & 0xffff);
		if (ret < 0)
			return ret;

		return mt9m032_write(client, MT9M032_SHUTTER_WIDTH_LOW,
				     ctrl->val & 0xffff);
	}

	return 0;
}

static struct v4l2_ctrl_ops mt9m032_ctrl_ops = {
	.s_ctrl = mt9m032_set_ctrl,
	.try_ctrl = mt9m032_try_ctrl,
};

/* -------------------------------------------------------------------------- */

static const struct v4l2_subdev_core_ops mt9m032_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register = mt9m032_g_register,
	.s_register = mt9m032_s_register,
#endif
};

static const struct v4l2_subdev_video_ops mt9m032_video_ops = {
	.s_stream = mt9m032_s_stream,
	.g_frame_interval = mt9m032_get_frame_interval,
	.s_frame_interval = mt9m032_set_frame_interval,
};

static const struct v4l2_subdev_pad_ops mt9m032_pad_ops = {
	.enum_mbus_code = mt9m032_enum_mbus_code,
	.enum_frame_size = mt9m032_enum_frame_size,
	.get_fmt = mt9m032_get_pad_format,
	.set_fmt = mt9m032_set_pad_format,
	.set_crop = mt9m032_set_pad_crop,
	.get_crop = mt9m032_get_pad_crop,
};

static const struct v4l2_subdev_ops mt9m032_ops = {
	.core = &mt9m032_core_ops,
	.video = &mt9m032_video_ops,
	.pad = &mt9m032_pad_ops,
};

/* -----------------------------------------------------------------------------
 * Driver initialization and probing
 */

static int mt9m032_probe(struct i2c_client *client,
			 const struct i2c_device_id *devid)
{
	struct i2c_adapter *adapter = client->adapter;
	struct mt9m032 *sensor;
	int chip_version;
	int ret;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
		dev_warn(&client->dev,
			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
		return -EIO;
	}

	if (!client->dev.platform_data)
		return -ENODEV;

	sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
	if (sensor == NULL)
		return -ENOMEM;

	mutex_init(&sensor->lock);

	sensor->pdata = client->dev.platform_data;

	v4l2_i2c_subdev_init(&sensor->subdev, client, &mt9m032_ops);
	sensor->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	chip_version = mt9m032_read(client, MT9M032_CHIP_VERSION);
	if (chip_version != MT9M032_CHIP_VERSION_VALUE) {
		dev_err(&client->dev, "MT9M032 not detected, wrong version "
			"0x%04x\n", chip_version);
		ret = -ENODEV;
		goto error_sensor;
	}

	dev_info(&client->dev, "MT9M032 detected at address 0x%02x\n",
		 client->addr);

	sensor->frame_interval.numerator = 1;
	sensor->frame_interval.denominator = 30;

	sensor->crop.left = MT9M032_COLUMN_START_DEF;
	sensor->crop.top = MT9M032_ROW_START_DEF;
	sensor->crop.width = MT9M032_COLUMN_SIZE_DEF;
	sensor->crop.height = MT9M032_ROW_SIZE_DEF;

	sensor->format.width = sensor->crop.width;
	sensor->format.height = sensor->crop.height;
	sensor->format.code = V4L2_MBUS_FMT_Y8_1X8;
	sensor->format.field = V4L2_FIELD_NONE;
	sensor->format.colorspace = V4L2_COLORSPACE_SRGB;

	v4l2_ctrl_handler_init(&sensor->ctrls, 4);

	v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
			  V4L2_CID_GAIN, 0, 127, 1, 64);

	sensor->hflip = v4l2_ctrl_new_std(&sensor->ctrls,
					  &mt9m032_ctrl_ops,
					  V4L2_CID_HFLIP, 0, 1, 1, 0);
	sensor->vflip = v4l2_ctrl_new_std(&sensor->ctrls,
					  &mt9m032_ctrl_ops,
					  V4L2_CID_VFLIP, 0, 1, 1, 0);

	v4l2_ctrl_new_std(&sensor->ctrls, &mt9m032_ctrl_ops,
			  V4L2_CID_EXPOSURE, MT9M032_SHUTTER_WIDTH_MIN,
			  MT9M032_SHUTTER_WIDTH_MAX, 1,
			  MT9M032_SHUTTER_WIDTH_DEF);

	if (sensor->ctrls.error) {
		ret = sensor->ctrls.error;
		dev_err(&client->dev, "control initialization error %d\n", ret);
		goto error_ctrl;
	}

	v4l2_ctrl_cluster(2, &sensor->hflip);

	sensor->subdev.ctrl_handler = &sensor->ctrls;
	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_init(&sensor->subdev.entity, 1, &sensor->pad, 0);
	if (ret < 0)
		goto error_ctrl;

	ret = mt9m032_write(client, MT9M032_RESET, 1);	/* reset on */
	if (ret < 0)
		goto error_entity;
	mt9m032_write(client, MT9M032_RESET, 0);	/* reset off */
	if (ret < 0)
		goto error_entity;

	ret = mt9m032_setup_pll(sensor);
	if (ret < 0)
		goto error_entity;
	usleep_range(10000, 11000);

	ret = v4l2_ctrl_handler_setup(&sensor->ctrls);
	if (ret < 0)
		goto error_entity;

	/* SIZE */
	ret = mt9m032_update_geom_timing(sensor);
	if (ret < 0)
		goto error_entity;

	ret = mt9m032_write(client, 0x41, 0x0000);	/* reserved !!! */
	if (ret < 0)
		goto error_entity;
	ret = mt9m032_write(client, 0x42, 0x0003);	/* reserved !!! */
	if (ret < 0)
		goto error_entity;
	ret = mt9m032_write(client, 0x43, 0x0003);	/* reserved !!! */
	if (ret < 0)
		goto error_entity;
	ret = mt9m032_write(client, 0x7f, 0x0000);	/* reserved !!! */
	if (ret < 0)
		goto error_entity;
	if (sensor->pdata->invert_pixclock) {
		ret = mt9m032_write(client, MT9M032_PIX_CLK_CTRL,
				    MT9M032_PIX_CLK_CTRL_INV_PIXCLK);
		if (ret < 0)
			goto error_entity;
	}

	ret = mt9m032_write(client, MT9M032_RESTART, 1); /* Restart on */
	if (ret < 0)
		goto error_entity;
	msleep(100);
	ret = mt9m032_write(client, MT9M032_RESTART, 0); /* Restart off */
	if (ret < 0)
		goto error_entity;
	msleep(100);
	ret = update_formatter2(sensor, false);
	if (ret < 0)
		goto error_entity;

	return ret;

error_entity:
	media_entity_cleanup(&sensor->subdev.entity);
error_ctrl:
	v4l2_ctrl_handler_free(&sensor->ctrls);
error_sensor:
	mutex_destroy(&sensor->lock);
	kfree(sensor);
	return ret;
}

static int mt9m032_remove(struct i2c_client *client)
{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct mt9m032 *sensor = to_mt9m032(subdev);

	v4l2_device_unregister_subdev(&sensor->subdev);
	v4l2_ctrl_handler_free(&sensor->ctrls);
	media_entity_cleanup(&sensor->subdev.entity);
	mutex_destroy(&sensor->lock);
	kfree(sensor);
	return 0;
}

static const struct i2c_device_id mt9m032_id_table[] = {
	{ MT9M032_NAME, 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, mt9m032_id_table);

static struct i2c_driver mt9m032_i2c_driver = {
	.driver = {
		.name = MT9M032_NAME,
	},
	.probe = mt9m032_probe,
	.remove = mt9m032_remove,
	.id_table = mt9m032_id_table,
};

module_i2c_driver(mt9m032_i2c_driver);

MODULE_AUTHOR("Martin Hostettler <martin@neutronstar.dyndns.org>");
MODULE_DESCRIPTION("MT9M032 camera sensor driver");
MODULE_LICENSE("GPL v2");