aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/tcm825x.c
blob: e57a646057785eb51dd331febc4db1772284204c (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
/*
 * drivers/media/video/tcm825x.c
 *
 * TCM825X camera sensor driver.
 *
 * Copyright (C) 2007 Nokia Corporation.
 *
 * Contact: Sakari Ailus <sakari.ailus@nokia.com>
 *
 * Based on code from David Cohen <david.cohen@indt.org.br>
 *
 * This driver was based on ov9640 sensor driver from MontaVista
 *
 * 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/i2c.h>
#include <media/v4l2-int-device.h>

#include "tcm825x.h"

/*
 * The sensor has two fps modes: the lower one just gives half the fps
 * at the same xclk than the high one.
 */
#define MAX_FPS 30
#define MIN_FPS 8
#define MAX_HALF_FPS (MAX_FPS / 2)
#define HIGH_FPS_MODE_LOWER_LIMIT 14
#define DEFAULT_FPS MAX_HALF_FPS

struct tcm825x_sensor {
	const struct tcm825x_platform_data *platform_data;
	struct v4l2_int_device *v4l2_int_device;
	struct i2c_client *i2c_client;
	struct v4l2_pix_format pix;
	struct v4l2_fract timeperframe;
};

/* list of image formats supported by TCM825X sensor */
const static struct v4l2_fmtdesc tcm825x_formats[] = {
	{
		.description = "YUYV (YUV 4:2:2), packed",
		.pixelformat = V4L2_PIX_FMT_UYVY,
	}, {
		/* Note:  V4L2 defines RGB565 as:
		 *
		 *      Byte 0                    Byte 1
		 *      g2 g1 g0 r4 r3 r2 r1 r0   b4 b3 b2 b1 b0 g5 g4 g3
		 *
		 * We interpret RGB565 as:
		 *
		 *      Byte 0                    Byte 1
		 *      g2 g1 g0 b4 b3 b2 b1 b0   r4 r3 r2 r1 r0 g5 g4 g3
		 */
		.description = "RGB565, le",
		.pixelformat = V4L2_PIX_FMT_RGB565,
	},
};

#define TCM825X_NUM_CAPTURE_FORMATS	ARRAY_SIZE(tcm825x_formats)

/*
 * TCM825X register configuration for all combinations of pixel format and
 * image size
 */
const static struct tcm825x_reg subqcif	=	{ 0x20, TCM825X_PICSIZ };
const static struct tcm825x_reg qcif	=	{ 0x18, TCM825X_PICSIZ };
const static struct tcm825x_reg cif	=	{ 0x14, TCM825X_PICSIZ };
const static struct tcm825x_reg qqvga	=	{ 0x0c, TCM825X_PICSIZ };
const static struct tcm825x_reg qvga	=	{ 0x04, TCM825X_PICSIZ };
const static struct tcm825x_reg vga	=	{ 0x00, TCM825X_PICSIZ };

const static struct tcm825x_reg yuv422	=	{ 0x00, TCM825X_PICFMT };
const static struct tcm825x_reg rgb565	=	{ 0x02, TCM825X_PICFMT };

/* Our own specific controls */
#define V4L2_CID_ALC				V4L2_CID_PRIVATE_BASE
#define V4L2_CID_H_EDGE_EN			V4L2_CID_PRIVATE_BASE + 1
#define V4L2_CID_V_EDGE_EN			V4L2_CID_PRIVATE_BASE + 2
#define V4L2_CID_LENS				V4L2_CID_PRIVATE_BASE + 3
#define V4L2_CID_MAX_EXPOSURE_TIME		V4L2_CID_PRIVATE_BASE + 4
#define V4L2_CID_LAST_PRIV			V4L2_CID_MAX_EXPOSURE_TIME

/*  Video controls  */
static struct vcontrol {
	struct v4l2_queryctrl qc;
	u16 reg;
	u16 start_bit;
} video_control[] = {
	{
		{
			.id = V4L2_CID_GAIN,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Gain",
			.minimum = 0,
			.maximum = 63,
			.step = 1,
		},
		.reg = TCM825X_AG,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_RED_BALANCE,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Red Balance",
			.minimum = 0,
			.maximum = 255,
			.step = 1,
		},
		.reg = TCM825X_MRG,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_BLUE_BALANCE,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Blue Balance",
			.minimum = 0,
			.maximum = 255,
			.step = 1,
		},
		.reg = TCM825X_MBG,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_AUTO_WHITE_BALANCE,
			.type = V4L2_CTRL_TYPE_BOOLEAN,
			.name = "Auto White Balance",
			.minimum = 0,
			.maximum = 1,
			.step = 0,
		},
		.reg = TCM825X_AWBSW,
		.start_bit = 7,
	},
	{
		{
			.id = V4L2_CID_EXPOSURE,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Exposure Time",
			.minimum = 0,
			.maximum = 0x1fff,
			.step = 1,
		},
		.reg = TCM825X_ESRSPD_U,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_HFLIP,
			.type = V4L2_CTRL_TYPE_BOOLEAN,
			.name = "Mirror Image",
			.minimum = 0,
			.maximum = 1,
			.step = 0,
		},
		.reg = TCM825X_H_INV,
		.start_bit = 6,
	},
	{
		{
			.id = V4L2_CID_VFLIP,
			.type = V4L2_CTRL_TYPE_BOOLEAN,
			.name = "Vertical Flip",
			.minimum = 0,
			.maximum = 1,
			.step = 0,
		},
		.reg = TCM825X_V_INV,
		.start_bit = 7,
	},
	/* Private controls */
	{
		{
			.id = V4L2_CID_ALC,
			.type = V4L2_CTRL_TYPE_BOOLEAN,
			.name = "Auto Luminance Control",
			.minimum = 0,
			.maximum = 1,
			.step = 0,
		},
		.reg = TCM825X_ALCSW,
		.start_bit = 7,
	},
	{
		{
			.id = V4L2_CID_H_EDGE_EN,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Horizontal Edge Enhancement",
			.minimum = 0,
			.maximum = 0xff,
			.step = 1,
		},
		.reg = TCM825X_HDTG,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_V_EDGE_EN,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Vertical Edge Enhancement",
			.minimum = 0,
			.maximum = 0xff,
			.step = 1,
		},
		.reg = TCM825X_VDTG,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_LENS,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Lens Shading Compensation",
			.minimum = 0,
			.maximum = 0x3f,
			.step = 1,
		},
		.reg = TCM825X_LENS,
		.start_bit = 0,
	},
	{
		{
			.id = V4L2_CID_MAX_EXPOSURE_TIME,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Maximum Exposure Time",
			.minimum = 0,
			.maximum = 0x3,
			.step = 1,
		},
		.reg = TCM825X_ESRLIM,
		.start_bit = 5,
	},
};


const static struct tcm825x_reg *tcm825x_siz_reg[NUM_IMAGE_SIZES] =
{ &subqcif, &qqvga, &qcif, &qvga, &cif, &vga };

const static struct tcm825x_reg *tcm825x_fmt_reg[NUM_PIXEL_FORMATS] =
{ &yuv422, &rgb565 };

/*
 * Read a value from a register in an TCM825X sensor device.  The value is
 * returned in 'val'.
 * Returns zero if successful, or non-zero otherwise.
 */
static int tcm825x_read_reg(struct i2c_client *client, int reg)
{
	int err;
	struct i2c_msg msg[2];
	u8 reg_buf, data_buf = 0;

	if (!client->adapter)
		return -ENODEV;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].len = 1;
	msg[0].buf = &reg_buf;
	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].len = 1;
	msg[1].buf = &data_buf;

	reg_buf = reg;

	err = i2c_transfer(client->adapter, msg, 2);
	if (err < 0)
		return err;
	return data_buf;
}

/*
 * Write a value to a register in an TCM825X sensor device.
 * Returns zero if successful, or non-zero otherwise.
 */
static int tcm825x_write_reg(struct i2c_client *client, u8 reg, u8 val)
{
	int err;
	struct i2c_msg msg[1];
	unsigned char data[2];

	if (!client->adapter)
		return -ENODEV;

	msg->addr = client->addr;
	msg->flags = 0;
	msg->len = 2;
	msg->buf = data;
	data[0] = reg;
	data[1] = val;
	err = i2c_transfer(client->adapter, msg, 1);
	if (err >= 0)
		return 0;
	return err;
}

static int __tcm825x_write_reg_mask(struct i2c_client *client,
				    u8 reg, u8 val, u8 mask)
{
	int rc;

	/* need to do read - modify - write */
	rc = tcm825x_read_reg(client, reg);
	if (rc < 0)
		return rc;

	rc &= (~mask);	/* Clear the masked bits */
	val &= mask;	/* Enforce mask on value */
	val |= rc;

	/* write the new value to the register */
	rc = tcm825x_write_reg(client, reg, val);
	if (rc)
		return rc;

	return 0;
}

#define tcm825x_write_reg_mask(client, regmask, val)			\
	__tcm825x_write_reg_mask(client, TCM825X_ADDR((regmask)), val,	\
				 TCM825X_MASK((regmask)))


/*
 * Initialize a list of TCM825X registers.
 * The list of registers is terminated by the pair of values
 * { TCM825X_REG_TERM, TCM825X_VAL_TERM }.
 * Returns zero if successful, or non-zero otherwise.
 */
static int tcm825x_write_default_regs(struct i2c_client *client,
				      const struct tcm825x_reg *reglist)
{
	int err;
	const struct tcm825x_reg *next = reglist;

	while (!((next->reg == TCM825X_REG_TERM)
		 && (next->val == TCM825X_VAL_TERM))) {
		err = tcm825x_write_reg(client, next->reg, next->val);
		if (err) {
			dev_err(&client->dev, "register writing failed\n");
			return err;
		}
		next++;
	}

	return 0;
}

static struct vcontrol *find_vctrl(int id)
{
	int i;

	if (id < V4L2_CID_BASE)
		return NULL;

	for (i = 0; i < ARRAY_SIZE(video_control); i++)
		if (video_control[i].qc.id == id)
			return &video_control[i];

	return NULL;
}

/*
 * Find the best match for a requested image capture size.  The best match
 * is chosen as the nearest match that has the same number or fewer pixels
 * as the requested size, or the smallest image size if the requested size
 * has fewer pixels than the smallest image.
 */
static enum image_size tcm825x_find_size(struct v4l2_int_device *s,
					 unsigned int width,
					 unsigned int height)
{
	enum image_size isize;
	unsigned long pixels = width * height;
	struct tcm825x_sensor *sensor = s->priv;

	for (isize = subQCIF; isize < VGA; isize++) {
		if (tcm825x_sizes[isize + 1].height
		    * tcm825x_sizes[isize + 1].width > pixels) {
			dev_dbg(&sensor->i2c_client->dev, "size %d\n", isize);

			return isize;
		}
	}

	dev_dbg(&sensor->i2c_client->dev, "format default VGA\n");

	return VGA;
}

/*
 * Configure the TCM825X for current image size, pixel format, and
 * frame period. fper is the frame period (in seconds) expressed as a
 * fraction. Returns zero if successful, or non-zero otherwise. The
 * actual frame period is returned in fper.
 */
static int tcm825x_configure(struct v4l2_int_device *s)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_pix_format *pix = &sensor->pix;
	enum image_size isize = tcm825x_find_size(s, pix->width, pix->height);
	struct v4l2_fract *fper = &sensor->timeperframe;
	enum pixel_format pfmt;
	int err;
	u32 tgt_fps;
	u8 val;

	/* common register initialization */
	err = tcm825x_write_default_regs(
		sensor->i2c_client, sensor->platform_data->default_regs());
	if (err)
		return err;

	/* configure image size */
	val = tcm825x_siz_reg[isize]->val;
	dev_dbg(&sensor->i2c_client->dev,
		"configuring image size %d\n", isize);
	err = tcm825x_write_reg_mask(sensor->i2c_client,
				     tcm825x_siz_reg[isize]->reg, val);
	if (err)
		return err;

	/* configure pixel format */
	switch (pix->pixelformat) {
	default:
	case V4L2_PIX_FMT_RGB565:
		pfmt = RGB565;
		break;
	case V4L2_PIX_FMT_UYVY:
		pfmt = YUV422;
		break;
	}

	dev_dbg(&sensor->i2c_client->dev,
		"configuring pixel format %d\n", pfmt);
	val = tcm825x_fmt_reg[pfmt]->val;

	err = tcm825x_write_reg_mask(sensor->i2c_client,
				     tcm825x_fmt_reg[pfmt]->reg, val);
	if (err)
		return err;

	/*
	 * For frame rate < 15, the FPS reg (addr 0x02, bit 7) must be
	 * set. Frame rate will be halved from the normal.
	 */
	tgt_fps = fper->denominator / fper->numerator;
	if (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) {
		val = tcm825x_read_reg(sensor->i2c_client, 0x02);
		val |= 0x80;
		tcm825x_write_reg(sensor->i2c_client, 0x02, val);
	}

	return 0;
}

static int ioctl_queryctrl(struct v4l2_int_device *s,
				struct v4l2_queryctrl *qc)
{
	struct vcontrol *control;

	control = find_vctrl(qc->id);

	if (control == NULL)
		return -EINVAL;

	*qc = control->qc;

	return 0;
}

static int ioctl_g_ctrl(struct v4l2_int_device *s,
			     struct v4l2_control *vc)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct i2c_client *client = sensor->i2c_client;
	int val, r;
	struct vcontrol *lvc;

	/* exposure time is special, spread accross 2 registers */
	if (vc->id == V4L2_CID_EXPOSURE) {
		int val_lower, val_upper;

		val_upper = tcm825x_read_reg(client,
					     TCM825X_ADDR(TCM825X_ESRSPD_U));
		if (val_upper < 0)
			return val_upper;
		val_lower = tcm825x_read_reg(client,
					     TCM825X_ADDR(TCM825X_ESRSPD_L));
		if (val_lower < 0)
			return val_lower;

		vc->value = ((val_upper & 0x1f) << 8) | (val_lower);
		return 0;
	}

	lvc = find_vctrl(vc->id);
	if (lvc == NULL)
		return -EINVAL;

	r = tcm825x_read_reg(client, TCM825X_ADDR(lvc->reg));
	if (r < 0)
		return r;
	val = r & TCM825X_MASK(lvc->reg);
	val >>= lvc->start_bit;

	if (val < 0)
		return val;

	vc->value = val;
	return 0;
}

static int ioctl_s_ctrl(struct v4l2_int_device *s,
			     struct v4l2_control *vc)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct i2c_client *client = sensor->i2c_client;
	struct vcontrol *lvc;
	int val = vc->value;

	/* exposure time is special, spread accross 2 registers */
	if (vc->id == V4L2_CID_EXPOSURE) {
		int val_lower, val_upper;
		val_lower = val & TCM825X_MASK(TCM825X_ESRSPD_L);
		val_upper = (val >> 8) & TCM825X_MASK(TCM825X_ESRSPD_U);

		if (tcm825x_write_reg_mask(client,
					   TCM825X_ESRSPD_U, val_upper))
			return -EIO;

		if (tcm825x_write_reg_mask(client,
					   TCM825X_ESRSPD_L, val_lower))
			return -EIO;

		return 0;
	}

	lvc = find_vctrl(vc->id);
	if (lvc == NULL)
		return -EINVAL;

	val = val << lvc->start_bit;
	if (tcm825x_write_reg_mask(client, lvc->reg, val))
		return -EIO;

	return 0;
}

static int ioctl_enum_fmt_cap(struct v4l2_int_device *s,
				   struct v4l2_fmtdesc *fmt)
{
	int index = fmt->index;

	switch (fmt->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		if (index >= TCM825X_NUM_CAPTURE_FORMATS)
			return -EINVAL;
		break;

	default:
		return -EINVAL;
	}

	fmt->flags = tcm825x_formats[index].flags;
	strlcpy(fmt->description, tcm825x_formats[index].description,
		sizeof(fmt->description));
	fmt->pixelformat = tcm825x_formats[index].pixelformat;

	return 0;
}

static int ioctl_try_fmt_cap(struct v4l2_int_device *s,
			     struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;
	enum image_size isize;
	int ifmt;
	struct v4l2_pix_format *pix = &f->fmt.pix;

	isize = tcm825x_find_size(s, pix->width, pix->height);
	dev_dbg(&sensor->i2c_client->dev, "isize = %d num_capture = %lu\n",
		isize, (unsigned long)TCM825X_NUM_CAPTURE_FORMATS);

	pix->width = tcm825x_sizes[isize].width;
	pix->height = tcm825x_sizes[isize].height;

	for (ifmt = 0; ifmt < TCM825X_NUM_CAPTURE_FORMATS; ifmt++)
		if (pix->pixelformat == tcm825x_formats[ifmt].pixelformat)
			break;

	if (ifmt == TCM825X_NUM_CAPTURE_FORMATS)
		ifmt = 0;	/* Default = YUV 4:2:2 */

	pix->pixelformat = tcm825x_formats[ifmt].pixelformat;
	pix->field = V4L2_FIELD_NONE;
	pix->bytesperline = pix->width * TCM825X_BYTES_PER_PIXEL;
	pix->sizeimage = pix->bytesperline * pix->height;
	pix->priv = 0;
	dev_dbg(&sensor->i2c_client->dev, "format = 0x%08x\n",
		pix->pixelformat);

	switch (pix->pixelformat) {
	case V4L2_PIX_FMT_UYVY:
	default:
		pix->colorspace = V4L2_COLORSPACE_JPEG;
		break;
	case V4L2_PIX_FMT_RGB565:
		pix->colorspace = V4L2_COLORSPACE_SRGB;
		break;
	}

	return 0;
}

static int ioctl_s_fmt_cap(struct v4l2_int_device *s,
				struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_pix_format *pix = &f->fmt.pix;
	int rval;

	rval = ioctl_try_fmt_cap(s, f);
	if (rval)
		return rval;

	rval = tcm825x_configure(s);

	sensor->pix = *pix;

	return rval;
}

static int ioctl_g_fmt_cap(struct v4l2_int_device *s,
				struct v4l2_format *f)
{
	struct tcm825x_sensor *sensor = s->priv;

	f->fmt.pix = sensor->pix;

	return 0;
}

static int ioctl_g_parm(struct v4l2_int_device *s,
			     struct v4l2_streamparm *a)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_captureparm *cparm = &a->parm.capture;

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

	memset(a, 0, sizeof(*a));
	a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	cparm->capability = V4L2_CAP_TIMEPERFRAME;
	cparm->timeperframe = sensor->timeperframe;

	return 0;
}

static int ioctl_s_parm(struct v4l2_int_device *s,
			     struct v4l2_streamparm *a)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_fract *timeperframe = &a->parm.capture.timeperframe;
	u32 tgt_fps;	/* target frames per secound */
	int rval;

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

	if ((timeperframe->numerator == 0)
	    || (timeperframe->denominator == 0)) {
		timeperframe->denominator = DEFAULT_FPS;
		timeperframe->numerator = 1;
	}

	tgt_fps = timeperframe->denominator / timeperframe->numerator;

	if (tgt_fps > MAX_FPS) {
		timeperframe->denominator = MAX_FPS;
		timeperframe->numerator = 1;
	} else if (tgt_fps < MIN_FPS) {
		timeperframe->denominator = MIN_FPS;
		timeperframe->numerator = 1;
	}

	sensor->timeperframe = *timeperframe;

	rval = tcm825x_configure(s);

	return rval;
}

static int ioctl_s_power(struct v4l2_int_device *s, int on)
{
	struct tcm825x_sensor *sensor = s->priv;

	return sensor->platform_data->power_set(on);
}

/*
 * Given the image capture format in pix, the nominal frame period in
 * timeperframe, calculate the required xclk frequency.
 *
 * TCM825X input frequency characteristics are:
 *     Minimum 11.9 MHz, Typical 24.57 MHz and maximum 25/27 MHz
 */

static int ioctl_g_ifparm(struct v4l2_int_device *s, struct v4l2_ifparm *p)
{
	struct tcm825x_sensor *sensor = s->priv;
	struct v4l2_fract *timeperframe = &sensor->timeperframe;
	u32 tgt_xclk;	/* target xclk */
	u32 tgt_fps;	/* target frames per secound */
	int rval;

	rval = sensor->platform_data->ifparm(p);
	if (rval)
		return rval;

	tgt_fps = timeperframe->denominator / timeperframe->numerator;

	tgt_xclk = (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) ?
		(2457 * tgt_fps) / MAX_HALF_FPS :
		(2457 * tgt_fps) / MAX_FPS;
	tgt_xclk *= 10000;

	tgt_xclk = min(tgt_xclk, (u32)TCM825X_XCLK_MAX);
	tgt_xclk = max(tgt_xclk, (u32)TCM825X_XCLK_MIN);

	p->u.bt656.clock_curr = tgt_xclk;

	return 0;
}

static int ioctl_g_needs_reset(struct v4l2_int_device *s, void *buf)
{
	struct tcm825x_sensor *sensor = s->priv;

	return sensor->platform_data->needs_reset(s, buf, &sensor->pix);
}

static int ioctl_reset(struct v4l2_int_device *s)
{
	return -EBUSY;
}

static int ioctl_init(struct v4l2_int_device *s)
{
	return tcm825x_configure(s);
}

static int ioctl_dev_exit(struct v4l2_int_device *s)
{
	return 0;
}

static int ioctl_dev_init(struct v4l2_int_device *s)
{
	struct tcm825x_sensor *sensor = s->priv;
	int r;

	r = tcm825x_read_reg(sensor->i2c_client, 0x01);
	if (r < 0)
		return r;
	if (r == 0) {
		dev_err(&sensor->i2c_client->dev, "device not detected\n");
		return -EIO;
	}
	return 0;
}

static struct v4l2_int_ioctl_desc tcm825x_ioctl_desc[] = {
	{ vidioc_int_dev_init_num,
	  (v4l2_int_ioctl_func *)ioctl_dev_init },
	{ vidioc_int_dev_exit_num,
	  (v4l2_int_ioctl_func *)ioctl_dev_exit },
	{ vidioc_int_s_power_num,
	  (v4l2_int_ioctl_func *)ioctl_s_power },
	{ vidioc_int_g_ifparm_num,
	  (v4l2_int_ioctl_func *)ioctl_g_ifparm },
	{ vidioc_int_g_needs_reset_num,
	  (v4l2_int_ioctl_func *)ioctl_g_needs_reset },
	{ vidioc_int_reset_num,
	  (v4l2_int_ioctl_func *)ioctl_reset },
	{ vidioc_int_init_num,
	  (v4l2_int_ioctl_func *)ioctl_init },
	{ vidioc_int_enum_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_enum_fmt_cap },
	{ vidioc_int_try_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_try_fmt_cap },
	{ vidioc_int_g_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_g_fmt_cap },
	{ vidioc_int_s_fmt_cap_num,
	  (v4l2_int_ioctl_func *)ioctl_s_fmt_cap },
	{ vidioc_int_g_parm_num,
	  (v4l2_int_ioctl_func *)ioctl_g_parm },
	{ vidioc_int_s_parm_num,
	  (v4l2_int_ioctl_func *)ioctl_s_parm },
	{ vidioc_int_queryctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_queryctrl },
	{ vidioc_int_g_ctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_g_ctrl },
	{ vidioc_int_s_ctrl_num,
	  (v4l2_int_ioctl_func *)ioctl_s_ctrl },
};

static struct v4l2_int_slave tcm825x_slave = {
	.ioctls = tcm825x_ioctl_desc,
	.num_ioctls = ARRAY_SIZE(tcm825x_ioctl_desc),
};

static struct tcm825x_sensor tcm825x;

static struct v4l2_int_device tcm825x_int_device = {
	.module = THIS_MODULE,
	.name = TCM825X_NAME,
	.priv = &tcm825x,
	.type = v4l2_int_type_slave,
	.u = {
		.slave = &tcm825x_slave,
	},
};

static int tcm825x_probe(struct i2c_client *client,
			 const struct i2c_device_id *did)
{
	struct tcm825x_sensor *sensor = &tcm825x;
	int rval;

	if (i2c_get_clientdata(client))
		return -EBUSY;

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

	if (sensor->platform_data == NULL
	    || !sensor->platform_data->is_okay())
		return -ENODEV;

	sensor->v4l2_int_device = &tcm825x_int_device;

	sensor->i2c_client = client;
	i2c_set_clientdata(client, sensor);

	/* Make the default capture format QVGA RGB565 */
	sensor->pix.width = tcm825x_sizes[QVGA].width;
	sensor->pix.height = tcm825x_sizes[QVGA].height;
	sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565;

	rval = v4l2_int_device_register(sensor->v4l2_int_device);
	if (rval)
		i2c_set_clientdata(client, NULL);

	return rval;
}

static int __exit tcm825x_remove(struct i2c_client *client)
{
	struct tcm825x_sensor *sensor = i2c_get_clientdata(client);

	if (!client->adapter)
		return -ENODEV;	/* our client isn't attached */

	v4l2_int_device_unregister(sensor->v4l2_int_device);
	i2c_set_clientdata(client, NULL);

	return 0;
}

static struct i2c_driver tcm825x_i2c_driver = {
	.driver	= {
		.name = TCM825X_NAME,
	},
	.probe	= tcm825x_probe,
	.remove	= __exit_p(tcm825x_remove),
};

static struct tcm825x_sensor tcm825x = {
	.timeperframe = {
		.numerator   = 1,
		.denominator = DEFAULT_FPS,
	},
};

static int __init tcm825x_init(void)
{
	int rval;

	rval = i2c_add_driver(&tcm825x_i2c_driver);
	if (rval)
		printk(KERN_INFO "%s: failed registering " TCM825X_NAME "\n",
		       __func__);

	return rval;
}

static void __exit tcm825x_exit(void)
{
	i2c_del_driver(&tcm825x_i2c_driver);
}

/*
 * FIXME: Menelaus isn't ready (?) at module_init stage, so use
 * late_initcall for now.
 */
late_initcall(tcm825x_init);
module_exit(tcm825x_exit);

MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
MODULE_DESCRIPTION("TCM825x camera sensor driver");
MODULE_LICENSE("GPL");