summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/gspca/pac7302.c
blob: 608be0d64f94b46339827529679e1a8052c3fe56 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Pixart PAC7302 driver
 *
 * Copyright (C) 2008-2012 Jean-Francois Moine <http://moinejf.free.fr>
 * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
 *
 * Separated from Pixart PAC7311 library by Márton Németh
 * Camera button input handling by Márton Németh <nm127@freemail.hu>
 * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
 */

/*
 * Some documentation about various registers as determined by trial and error.
 *
 * Register page 0:
 *
 * Address	Description
 * 0x01		Red balance control
 * 0x02		Green balance control
 * 0x03		Blue balance control
 *		     The Windows driver uses a quadratic approach to map
 *		     the settable values (0-200) on register values:
 *		     min=0x20, default=0x40, max=0x80
 * 0x0f-0x20	Color and saturation control
 * 0xa2-0xab	Brightness, contrast and gamma control
 * 0xb6		Sharpness control (bits 0-4)
 *
 * Register page 1:
 *
 * Address	Description
 * 0x78		Global control, bit 6 controls the LED (inverted)
 * 0x80		Compression balance, 2 interesting settings:
 *		0x0f Default
 *		0x50 Values >= this switch the camera to a lower compression,
 *		     using the same table for both luminance and chrominance.
 *		     This gives a sharper picture. Only usable when running
 *		     at < 15 fps! Note currently the driver does not use this
 *		     as the quality gain is small and the generated JPG-s are
 *		     only understood by v4l-utils >= 0.8.9
 *
 * Register page 3:
 *
 * Address	Description
 * 0x02		Clock divider 3-63, fps = 90 / val. Must be a multiple of 3 on
 *		the 7302, so one of 3, 6, 9, ..., except when between 6 and 12?
 * 0x03		Variable framerate ctrl reg2==3: 0 -> ~30 fps, 255 -> ~22fps
 * 0x04		Another var framerate ctrl reg2==3, reg3==0: 0 -> ~30 fps,
 *		63 -> ~27 fps, the 2 msb's must always be 1 !!
 * 0x05		Another var framerate ctrl reg2==3, reg3==0, reg4==0xc0:
 *		1 -> ~30 fps, 2 -> ~20 fps
 * 0x0e		Exposure bits 0-7, 0-448, 0 = use full frame time
 * 0x0f		Exposure bit 8, 0-448, 448 = no exposure at all
 * 0x10		Gain 0-31
 * 0x12		Another gain 0-31, unlike 0x10 this one seems to start with an
 *		amplification value of 1 rather then 0 at its lowest setting
 * 0x21		Bitfield: 0-1 unused, 2-3 vflip/hflip, 4-5 unknown, 6-7 unused
 * 0x80		Another framerate control, best left at 1, moving it from 1 to
 *		2 causes the framerate to become 3/4th of what it was, and
 *		also seems to cause pixel averaging, resulting in an effective
 *		resolution of 320x240 and thus a much blockier image
 *
 * The registers are accessed in the following functions:
 *
 * Page | Register   | Function
 * -----+------------+---------------------------------------------------
 *  0   | 0x01       | setredbalance()
 *  0   | 0x03       | setbluebalance()
 *  0   | 0x0f..0x20 | setcolors()
 *  0   | 0xa2..0xab | setbrightcont()
 *  0   | 0xb6       | setsharpness()
 *  0   | 0xc6       | setwhitebalance()
 *  0   | 0xdc       | setbrightcont(), setcolors()
 *  3   | 0x02       | setexposure()
 *  3   | 0x10, 0x12 | setgain()
 *  3   | 0x11       | setcolors(), setgain(), setexposure(), sethvflip()
 *  3   | 0x21       | sethvflip()
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/input.h>
#include "gspca.h"
/* Include pac common sof detection functions */
#include "pac_common.h"

#define PAC7302_RGB_BALANCE_MIN		  0
#define PAC7302_RGB_BALANCE_MAX		200
#define PAC7302_RGB_BALANCE_DEFAULT	100
#define PAC7302_GAIN_DEFAULT		 15
#define PAC7302_GAIN_KNEE		 42
#define PAC7302_EXPOSURE_DEFAULT	 66 /* 33 ms / 30 fps */
#define PAC7302_EXPOSURE_KNEE		133 /* 66 ms / 15 fps */

MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>, Thomas Kaiser thomas@kaiser-linux.li");
MODULE_DESCRIPTION("Pixart PAC7302");
MODULE_LICENSE("GPL");

struct sd {
	struct gspca_dev gspca_dev;		/* !! must be the first item */

	struct { /* brightness / contrast cluster */
		struct v4l2_ctrl *brightness;
		struct v4l2_ctrl *contrast;
	};
	struct v4l2_ctrl *saturation;
	struct v4l2_ctrl *white_balance;
	struct v4l2_ctrl *red_balance;
	struct v4l2_ctrl *blue_balance;
	struct { /* flip cluster */
		struct v4l2_ctrl *hflip;
		struct v4l2_ctrl *vflip;
	};
	struct v4l2_ctrl *sharpness;
	u8 flags;
#define FL_HFLIP 0x01		/* mirrored by default */
#define FL_VFLIP 0x02		/* vertical flipped by default */

	u8 sof_read;
	s8 autogain_ignore_frames;

	atomic_t avg_lum;
};

static const struct v4l2_pix_format vga_mode[] = {
	{640, 480, V4L2_PIX_FMT_PJPG, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480 * 3 / 8 + 590,
		.colorspace = V4L2_COLORSPACE_JPEG,
	},
};

#define LOAD_PAGE3		255
#define END_OF_SEQUENCE		0

static const u8 init_7302[] = {
/*	index,value */
	0xff, 0x01,		/* page 1 */
	0x78, 0x00,		/* deactivate */
	0xff, 0x01,
	0x78, 0x40,		/* led off */
};
static const u8 start_7302[] = {
/*	index, len, [value]* */
	0xff, 1,	0x00,		/* page 0 */
	0x00, 12,	0x01, 0x40, 0x40, 0x40, 0x01, 0xe0, 0x02, 0x80,
			0x00, 0x00, 0x00, 0x00,
	0x0d, 24,	0x03, 0x01, 0x00, 0xb5, 0x07, 0xcb, 0x00, 0x00,
			0x07, 0xc8, 0x00, 0xea, 0x07, 0xcf, 0x07, 0xf7,
			0x07, 0x7e, 0x01, 0x0b, 0x00, 0x00, 0x00, 0x11,
	0x26, 2,	0xaa, 0xaa,
	0x2e, 1,	0x31,
	0x38, 1,	0x01,
	0x3a, 3,	0x14, 0xff, 0x5a,
	0x43, 11,	0x00, 0x0a, 0x18, 0x11, 0x01, 0x2c, 0x88, 0x11,
			0x00, 0x54, 0x11,
	0x55, 1,	0x00,
	0x62, 4,	0x10, 0x1e, 0x1e, 0x18,
	0x6b, 1,	0x00,
	0x6e, 3,	0x08, 0x06, 0x00,
	0x72, 3,	0x00, 0xff, 0x00,
	0x7d, 23,	0x01, 0x01, 0x58, 0x46, 0x50, 0x3c, 0x50, 0x3c,
			0x54, 0x46, 0x54, 0x56, 0x52, 0x50, 0x52, 0x50,
			0x56, 0x64, 0xa4, 0x00, 0xda, 0x00, 0x00,
	0xa2, 10,	0x22, 0x2c, 0x3c, 0x54, 0x69, 0x7c, 0x9c, 0xb9,
			0xd2, 0xeb,
	0xaf, 1,	0x02,
	0xb5, 2,	0x08, 0x08,
	0xb8, 2,	0x08, 0x88,
	0xc4, 4,	0xae, 0x01, 0x04, 0x01,
	0xcc, 1,	0x00,
	0xd1, 11,	0x01, 0x30, 0x49, 0x5e, 0x6f, 0x7f, 0x8e, 0xa9,
			0xc1, 0xd7, 0xec,
	0xdc, 1,	0x01,
	0xff, 1,	0x01,		/* page 1 */
	0x12, 3,	0x02, 0x00, 0x01,
	0x3e, 2,	0x00, 0x00,
	0x76, 5,	0x01, 0x20, 0x40, 0x00, 0xf2,
	0x7c, 1,	0x00,
	0x7f, 10,	0x4b, 0x0f, 0x01, 0x2c, 0x02, 0x58, 0x03, 0x20,
			0x02, 0x00,
	0x96, 5,	0x01, 0x10, 0x04, 0x01, 0x04,
	0xc8, 14,	0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00,
			0x07, 0x00, 0x01, 0x07, 0x04, 0x01,
	0xd8, 1,	0x01,
	0xdb, 2,	0x00, 0x01,
	0xde, 7,	0x00, 0x01, 0x04, 0x04, 0x00, 0x00, 0x00,
	0xe6, 4,	0x00, 0x00, 0x00, 0x01,
	0xeb, 1,	0x00,
	0xff, 1,	0x02,		/* page 2 */
	0x22, 1,	0x00,
	0xff, 1,	0x03,		/* page 3 */
	0, LOAD_PAGE3,			/* load the page 3 */
	0x11, 1,	0x01,
	0xff, 1,	0x02,		/* page 2 */
	0x13, 1,	0x00,
	0x22, 4,	0x1f, 0xa4, 0xf0, 0x96,
	0x27, 2,	0x14, 0x0c,
	0x2a, 5,	0xc8, 0x00, 0x18, 0x12, 0x22,
	0x64, 8,	0x00, 0x00, 0xf0, 0x01, 0x14, 0x44, 0x44, 0x44,
	0x6e, 1,	0x08,
	0xff, 1,	0x01,		/* page 1 */
	0x78, 1,	0x00,
	0, END_OF_SEQUENCE		/* end of sequence */
};

#define SKIP		0xaa
/* page 3 - the value SKIP says skip the index - see reg_w_page() */
static const u8 page3_7302[] = {
	0x90, 0x40, 0x03, 0x00, 0xc0, 0x01, 0x14, 0x16,
	0x14, 0x12, 0x00, 0x00, 0x00, 0x02, 0x33, 0x00,
	0x0f, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x47, 0x01, 0xb3, 0x01, 0x00,
	0x00, 0x08, 0x00, 0x00, 0x0d, 0x00, 0x00, 0x21,
	0x00, 0x00, 0x00, 0x54, 0xf4, 0x02, 0x52, 0x54,
	0xa4, 0xb8, 0xe0, 0x2a, 0xf6, 0x00, 0x00, 0x00,
	0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0xfc, 0x00, 0xf2, 0x1f, 0x04, 0x00, 0x00,
	SKIP, 0x00, 0x00, 0xc0, 0xc0, 0x10, 0x00, 0x00,
	0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x40, 0xff, 0x03, 0x19, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0xc8, 0xc8, 0xc8,
	0xc8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50,
	0x08, 0x10, 0x24, 0x40, 0x00, 0x00, 0x00, 0x00,
	0x01, 0x00, 0x02, 0x47, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x02, 0xfa, 0x00, 0x64, 0x5a, 0x28, 0x00,
	0x00
};

static void reg_w_buf(struct gspca_dev *gspca_dev,
		u8 index,
		  const u8 *buffer, int len)
{
	int ret;

	if (gspca_dev->usb_err < 0)
		return;
	memcpy(gspca_dev->usb_buf, buffer, len);
	ret = usb_control_msg(gspca_dev->dev,
			usb_sndctrlpipe(gspca_dev->dev, 0),
			0,		/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0,		/* value */
			index, gspca_dev->usb_buf, len,
			500);
	if (ret < 0) {
		pr_err("reg_w_buf failed i: %02x error %d\n",
		       index, ret);
		gspca_dev->usb_err = ret;
	}
}


static void reg_w(struct gspca_dev *gspca_dev,
		u8 index,
		u8 value)
{
	int ret;

	if (gspca_dev->usb_err < 0)
		return;
	gspca_dev->usb_buf[0] = value;
	ret = usb_control_msg(gspca_dev->dev,
			usb_sndctrlpipe(gspca_dev->dev, 0),
			0,			/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0, index, gspca_dev->usb_buf, 1,
			500);
	if (ret < 0) {
		pr_err("reg_w() failed i: %02x v: %02x error %d\n",
		       index, value, ret);
		gspca_dev->usb_err = ret;
	}
}

static void reg_w_seq(struct gspca_dev *gspca_dev,
		const u8 *seq, int len)
{
	while (--len >= 0) {
		reg_w(gspca_dev, seq[0], seq[1]);
		seq += 2;
	}
}

/* load the beginning of a page */
static void reg_w_page(struct gspca_dev *gspca_dev,
			const u8 *page, int len)
{
	int index;
	int ret = 0;

	if (gspca_dev->usb_err < 0)
		return;
	for (index = 0; index < len; index++) {
		if (page[index] == SKIP)		/* skip this index */
			continue;
		gspca_dev->usb_buf[0] = page[index];
		ret = usb_control_msg(gspca_dev->dev,
				usb_sndctrlpipe(gspca_dev->dev, 0),
				0,			/* request */
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
				0, index, gspca_dev->usb_buf, 1,
				500);
		if (ret < 0) {
			pr_err("reg_w_page() failed i: %02x v: %02x error %d\n",
			       index, page[index], ret);
			gspca_dev->usb_err = ret;
			break;
		}
	}
}

/* output a variable sequence */
static void reg_w_var(struct gspca_dev *gspca_dev,
			const u8 *seq,
			const u8 *page3, unsigned int page3_len)
{
	int index, len;

	for (;;) {
		index = *seq++;
		len = *seq++;
		switch (len) {
		case END_OF_SEQUENCE:
			return;
		case LOAD_PAGE3:
			reg_w_page(gspca_dev, page3, page3_len);
			break;
		default:
			if (len > USB_BUF_SZ) {
				gspca_err(gspca_dev, "Incorrect variable sequence\n");
				return;
			}
			while (len > 0) {
				if (len < 8) {
					reg_w_buf(gspca_dev,
						index, seq, len);
					seq += len;
					break;
				}
				reg_w_buf(gspca_dev, index, seq, 8);
				seq += 8;
				index += 8;
				len -= 8;
			}
		}
	}
	/* not reached */
}

/* this function is called at probe time for pac7302 */
static int sd_config(struct gspca_dev *gspca_dev,
			const struct usb_device_id *id)
{
	struct sd *sd = (struct sd *) gspca_dev;
	struct cam *cam;

	cam = &gspca_dev->cam;

	cam->cam_mode = vga_mode;	/* only 640x480 */
	cam->nmodes = ARRAY_SIZE(vga_mode);

	sd->flags = id->driver_info;
	return 0;
}

static void setbrightcont(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int i, v;
	static const u8 max[10] =
		{0x29, 0x33, 0x42, 0x5a, 0x6e, 0x80, 0x9f, 0xbb,
		 0xd4, 0xec};
	static const u8 delta[10] =
		{0x35, 0x33, 0x33, 0x2f, 0x2a, 0x25, 0x1e, 0x17,
		 0x11, 0x0b};

	reg_w(gspca_dev, 0xff, 0x00);		/* page 0 */
	for (i = 0; i < 10; i++) {
		v = max[i];
		v += (sd->brightness->val - (s32)sd->brightness->maximum)
			* 150 / (s32)sd->brightness->maximum; /* 200 ? */
		v -= delta[i] * sd->contrast->val / (s32)sd->contrast->maximum;
		if (v < 0)
			v = 0;
		else if (v > 0xff)
			v = 0xff;
		reg_w(gspca_dev, 0xa2 + i, v);
	}
	reg_w(gspca_dev, 0xdc, 0x01);
}

static void setcolors(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int i, v;
	static const int a[9] =
		{217, -212, 0, -101, 170, -67, -38, -315, 355};
	static const int b[9] =
		{19, 106, 0, 19, 106, 1, 19, 106, 1};

	reg_w(gspca_dev, 0xff, 0x03);			/* page 3 */
	reg_w(gspca_dev, 0x11, 0x01);
	reg_w(gspca_dev, 0xff, 0x00);			/* page 0 */
	for (i = 0; i < 9; i++) {
		v = a[i] * sd->saturation->val / (s32)sd->saturation->maximum;
		v += b[i];
		reg_w(gspca_dev, 0x0f + 2 * i, (v >> 8) & 0x07);
		reg_w(gspca_dev, 0x0f + 2 * i + 1, v);
	}
	reg_w(gspca_dev, 0xdc, 0x01);
}

static void setwhitebalance(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	reg_w(gspca_dev, 0xff, 0x00);		/* page 0 */
	reg_w(gspca_dev, 0xc6, sd->white_balance->val);

	reg_w(gspca_dev, 0xdc, 0x01);
}

static u8 rgbbalance_ctrl_to_reg_value(s32 rgb_ctrl_val)
{
	const unsigned int k = 1000;	/* precision factor */
	unsigned int norm;

	/* Normed value [0...k] */
	norm = k * (rgb_ctrl_val - PAC7302_RGB_BALANCE_MIN)
		    / (PAC7302_RGB_BALANCE_MAX - PAC7302_RGB_BALANCE_MIN);
	/* Qudratic apporach improves control at small (register) values: */
	return 64 * norm * norm / (k*k)  +  32 * norm / k  +  32;
	/* Y = 64*X*X + 32*X + 32
	 * => register values 0x20-0x80; Windows driver uses these limits */

	/* NOTE: for full value range (0x00-0xff) use
	 *         Y = 254*X*X + X
	 *         => 254 * norm * norm / (k*k)  +  1 * norm / k	*/
}

static void setredbalance(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	reg_w(gspca_dev, 0xff, 0x00);			/* page 0 */
	reg_w(gspca_dev, 0x01,
	      rgbbalance_ctrl_to_reg_value(sd->red_balance->val));

	reg_w(gspca_dev, 0xdc, 0x01);
}

static void setbluebalance(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	reg_w(gspca_dev, 0xff, 0x00);			/* page 0 */
	reg_w(gspca_dev, 0x03,
	      rgbbalance_ctrl_to_reg_value(sd->blue_balance->val));

	reg_w(gspca_dev, 0xdc, 0x01);
}

static void setgain(struct gspca_dev *gspca_dev)
{
	u8 reg10, reg12;

	if (gspca_dev->gain->val < 32) {
		reg10 = gspca_dev->gain->val;
		reg12 = 0;
	} else {
		reg10 = 31;
		reg12 = gspca_dev->gain->val - 31;
	}

	reg_w(gspca_dev, 0xff, 0x03);			/* page 3 */
	reg_w(gspca_dev, 0x10, reg10);
	reg_w(gspca_dev, 0x12, reg12);

	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
}

static void setexposure(struct gspca_dev *gspca_dev)
{
	u8 clockdiv;
	u16 exposure;

	/*
	 * Register 2 of frame 3 contains the clock divider configuring the
	 * no fps according to the formula: 90 / reg. sd->exposure is the
	 * desired exposure time in 0.5 ms.
	 */
	clockdiv = (90 * gspca_dev->exposure->val + 1999) / 2000;

	/*
	 * Note clockdiv = 3 also works, but when running at 30 fps, depending
	 * on the scene being recorded, the camera switches to another
	 * quantization table for certain JPEG blocks, and we don't know how
	 * to decompress these blocks. So we cap the framerate at 15 fps.
	 */
	if (clockdiv < 6)
		clockdiv = 6;
	else if (clockdiv > 63)
		clockdiv = 63;

	/*
	 * Register 2 MUST be a multiple of 3, except when between 6 and 12?
	 * Always round up, otherwise we cannot get the desired frametime
	 * using the partial frame time exposure control.
	 */
	if (clockdiv < 6 || clockdiv > 12)
		clockdiv = ((clockdiv + 2) / 3) * 3;

	/*
	 * frame exposure time in ms = 1000 * clockdiv / 90    ->
	 * exposure = (sd->exposure / 2) * 448 / (1000 * clockdiv / 90)
	 */
	exposure = (gspca_dev->exposure->val * 45 * 448) / (1000 * clockdiv);
	/* 0 = use full frametime, 448 = no exposure, reverse it */
	exposure = 448 - exposure;

	reg_w(gspca_dev, 0xff, 0x03);			/* page 3 */
	reg_w(gspca_dev, 0x02, clockdiv);
	reg_w(gspca_dev, 0x0e, exposure & 0xff);
	reg_w(gspca_dev, 0x0f, exposure >> 8);

	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
}

static void sethvflip(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 data, hflip, vflip;

	hflip = sd->hflip->val;
	if (sd->flags & FL_HFLIP)
		hflip = !hflip;
	vflip = sd->vflip->val;
	if (sd->flags & FL_VFLIP)
		vflip = !vflip;

	reg_w(gspca_dev, 0xff, 0x03);			/* page 3 */
	data = (hflip ? 0x08 : 0x00) | (vflip ? 0x04 : 0x00);
	reg_w(gspca_dev, 0x21, data);

	/* load registers to sensor (Bit 0, auto clear) */
	reg_w(gspca_dev, 0x11, 0x01);
}

static void setsharpness(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	reg_w(gspca_dev, 0xff, 0x00);		/* page 0 */
	reg_w(gspca_dev, 0xb6, sd->sharpness->val);

	reg_w(gspca_dev, 0xdc, 0x01);
}

/* this function is called at probe and resume time for pac7302 */
static int sd_init(struct gspca_dev *gspca_dev)
{
	reg_w_seq(gspca_dev, init_7302, sizeof(init_7302)/2);
	return gspca_dev->usb_err;
}

static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct gspca_dev *gspca_dev =
		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
	struct sd *sd = (struct sd *)gspca_dev;

	gspca_dev->usb_err = 0;

	if (ctrl->id == V4L2_CID_AUTOGAIN && ctrl->is_new && ctrl->val) {
		/* when switching to autogain set defaults to make sure
		   we are on a valid point of the autogain gain /
		   exposure knee graph, and give this change time to
		   take effect before doing autogain. */
		gspca_dev->exposure->val    = PAC7302_EXPOSURE_DEFAULT;
		gspca_dev->gain->val        = PAC7302_GAIN_DEFAULT;
		sd->autogain_ignore_frames  = PAC_AUTOGAIN_IGNORE_FRAMES;
	}

	if (!gspca_dev->streaming)
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_BRIGHTNESS:
		setbrightcont(gspca_dev);
		break;
	case V4L2_CID_SATURATION:
		setcolors(gspca_dev);
		break;
	case V4L2_CID_WHITE_BALANCE_TEMPERATURE:
		setwhitebalance(gspca_dev);
		break;
	case V4L2_CID_RED_BALANCE:
		setredbalance(gspca_dev);
		break;
	case V4L2_CID_BLUE_BALANCE:
		setbluebalance(gspca_dev);
		break;
	case V4L2_CID_AUTOGAIN:
		if (gspca_dev->exposure->is_new || (ctrl->is_new && ctrl->val))
			setexposure(gspca_dev);
		if (gspca_dev->gain->is_new || (ctrl->is_new && ctrl->val))
			setgain(gspca_dev);
		break;
	case V4L2_CID_HFLIP:
		sethvflip(gspca_dev);
		break;
	case V4L2_CID_SHARPNESS:
		setsharpness(gspca_dev);
		break;
	default:
		return -EINVAL;
	}
	return gspca_dev->usb_err;
}

static const struct v4l2_ctrl_ops sd_ctrl_ops = {
	.s_ctrl = sd_s_ctrl,
};

/* this function is called at probe time */
static int sd_init_controls(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

	gspca_dev->vdev.ctrl_handler = hdl;
	v4l2_ctrl_handler_init(hdl, 12);

	sd->brightness = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_BRIGHTNESS, 0, 32, 1, 16);
	sd->contrast = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_CONTRAST, 0, 255, 1, 127);

	sd->saturation = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_SATURATION, 0, 255, 1, 127);
	sd->white_balance = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_WHITE_BALANCE_TEMPERATURE,
					0, 255, 1, 55);
	sd->red_balance = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_RED_BALANCE,
					PAC7302_RGB_BALANCE_MIN,
					PAC7302_RGB_BALANCE_MAX,
					1, PAC7302_RGB_BALANCE_DEFAULT);
	sd->blue_balance = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_BLUE_BALANCE,
					PAC7302_RGB_BALANCE_MIN,
					PAC7302_RGB_BALANCE_MAX,
					1, PAC7302_RGB_BALANCE_DEFAULT);

	gspca_dev->autogain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
	gspca_dev->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_EXPOSURE, 0, 1023, 1,
					PAC7302_EXPOSURE_DEFAULT);
	gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_GAIN, 0, 62, 1,
					PAC7302_GAIN_DEFAULT);

	sd->hflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
		V4L2_CID_HFLIP, 0, 1, 1, 0);
	sd->vflip = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
		V4L2_CID_VFLIP, 0, 1, 1, 0);

	sd->sharpness = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
					V4L2_CID_SHARPNESS, 0, 15, 1, 8);

	if (hdl->error) {
		pr_err("Could not initialize controls\n");
		return hdl->error;
	}

	v4l2_ctrl_cluster(2, &sd->brightness);
	v4l2_ctrl_auto_cluster(3, &gspca_dev->autogain, 0, false);
	v4l2_ctrl_cluster(2, &sd->hflip);
	return 0;
}

/* -- start the camera -- */
static int sd_start(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;

	reg_w_var(gspca_dev, start_7302,
		page3_7302, sizeof(page3_7302));

	sd->sof_read = 0;
	sd->autogain_ignore_frames = 0;
	atomic_set(&sd->avg_lum, 270 + sd->brightness->val);

	/* start stream */
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x78, 0x01);

	return gspca_dev->usb_err;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{

	/* stop stream */
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x78, 0x00);
}

/* called on streamoff with alt 0 and on disconnect for pac7302 */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
	if (!gspca_dev->present)
		return;
	reg_w(gspca_dev, 0xff, 0x01);
	reg_w(gspca_dev, 0x78, 0x40);
}

static void do_autogain(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int avg_lum = atomic_read(&sd->avg_lum);
	int desired_lum;
	const int deadzone = 30;

	if (sd->autogain_ignore_frames < 0)
		return;

	if (sd->autogain_ignore_frames > 0) {
		sd->autogain_ignore_frames--;
	} else {
		desired_lum = 270 + sd->brightness->val;

		if (gspca_expo_autogain(gspca_dev, avg_lum, desired_lum,
					deadzone, PAC7302_GAIN_KNEE,
					PAC7302_EXPOSURE_KNEE))
			sd->autogain_ignore_frames =
						PAC_AUTOGAIN_IGNORE_FRAMES;
	}
}

/* JPEG header */
static const u8 jpeg_header[] = {
	0xff, 0xd8,	/* SOI: Start of Image */

	0xff, 0xc0,	/* SOF0: Start of Frame (Baseline DCT) */
	0x00, 0x11,	/* length = 17 bytes (including this length field) */
	0x08,		/* Precision: 8 */
	0x02, 0x80,	/* height = 640 (image rotated) */
	0x01, 0xe0,	/* width = 480 */
	0x03,		/* Number of image components: 3 */
	0x01, 0x21, 0x00, /* ID=1, Subsampling 1x1, Quantization table: 0 */
	0x02, 0x11, 0x01, /* ID=2, Subsampling 2x1, Quantization table: 1 */
	0x03, 0x11, 0x01, /* ID=3, Subsampling 2x1, Quantization table: 1 */

	0xff, 0xda,	/* SOS: Start Of Scan */
	0x00, 0x0c,	/* length = 12 bytes (including this length field) */
	0x03,		/* number of components: 3 */
	0x01, 0x00,	/* selector 1, table 0x00 */
	0x02, 0x11,	/* selector 2, table 0x11 */
	0x03, 0x11,	/* selector 3, table 0x11 */
	0x00, 0x3f,	/* Spectral selection: 0 .. 63 */
	0x00		/* Successive approximation: 0 */
};

/* this function is run at interrupt level */
static void sd_pkt_scan(struct gspca_dev *gspca_dev,
			u8 *data,			/* isoc packet */
			int len)			/* iso packet length */
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 *image;
	u8 *sof;

	sof = pac_find_sof(gspca_dev, &sd->sof_read, data, len);
	if (sof) {
		int n, lum_offset, footer_length;

		/*
		 * 6 bytes after the FF D9 EOF marker a number of lumination
		 * bytes are send corresponding to different parts of the
		 * image, the 14th and 15th byte after the EOF seem to
		 * correspond to the center of the image.
		 */
		lum_offset = 61 + sizeof pac_sof_marker;
		footer_length = 74;

		/* Finish decoding current frame */
		n = (sof - data) - (footer_length + sizeof pac_sof_marker);
		if (n < 0) {
			gspca_dev->image_len += n;
		} else {
			gspca_frame_add(gspca_dev, INTER_PACKET, data, n);
		}

		image = gspca_dev->image;
		if (image != NULL
		 && image[gspca_dev->image_len - 2] == 0xff
		 && image[gspca_dev->image_len - 1] == 0xd9)
			gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);

		n = sof - data;
		len -= n;
		data = sof;

		/* Get average lumination */
		if (gspca_dev->last_packet_type == LAST_PACKET &&
				n >= lum_offset)
			atomic_set(&sd->avg_lum, data[-lum_offset] +
						data[-lum_offset + 1]);

		/* Start the new frame with the jpeg header */
		/* The PAC7302 has the image rotated 90 degrees */
		gspca_frame_add(gspca_dev, FIRST_PACKET,
				jpeg_header, sizeof jpeg_header);
	}
	gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int sd_dbg_s_register(struct gspca_dev *gspca_dev,
			const struct v4l2_dbg_register *reg)
{
	u8 index;
	u8 value;

	/*
	 * reg->reg: bit0..15: reserved for register index (wIndex is 16bit
	 *		       long on the USB bus)
	 */
	if (reg->match.addr == 0 &&
	    (reg->reg < 0x000000ff) &&
	    (reg->val <= 0x000000ff)
	) {
		/* Currently writing to page 0 is only supported. */
		/* reg_w() only supports 8bit index */
		index = reg->reg;
		value = reg->val;

		/*
		 * Note that there shall be no access to other page
		 * by any other function between the page switch and
		 * the actual register write.
		 */
		reg_w(gspca_dev, 0xff, 0x00);		/* page 0 */
		reg_w(gspca_dev, index, value);

		reg_w(gspca_dev, 0xdc, 0x01);
	}
	return gspca_dev->usb_err;
}
#endif

#if IS_ENABLED(CONFIG_INPUT)
static int sd_int_pkt_scan(struct gspca_dev *gspca_dev,
			u8 *data,		/* interrupt packet data */
			int len)		/* interrupt packet length */
{
	int ret = -EINVAL;
	u8 data0, data1;

	if (len == 2) {
		data0 = data[0];
		data1 = data[1];
		if ((data0 == 0x00 && data1 == 0x11) ||
		    (data0 == 0x22 && data1 == 0x33) ||
		    (data0 == 0x44 && data1 == 0x55) ||
		    (data0 == 0x66 && data1 == 0x77) ||
		    (data0 == 0x88 && data1 == 0x99) ||
		    (data0 == 0xaa && data1 == 0xbb) ||
		    (data0 == 0xcc && data1 == 0xdd) ||
		    (data0 == 0xee && data1 == 0xff)) {
			input_report_key(gspca_dev->input_dev, KEY_CAMERA, 1);
			input_sync(gspca_dev->input_dev);
			input_report_key(gspca_dev->input_dev, KEY_CAMERA, 0);
			input_sync(gspca_dev->input_dev);
			ret = 0;
		}
	}

	return ret;
}
#endif

/* sub-driver description for pac7302 */
static const struct sd_desc sd_desc = {
	.name = KBUILD_MODNAME,
	.config = sd_config,
	.init = sd_init,
	.init_controls = sd_init_controls,
	.start = sd_start,
	.stopN = sd_stopN,
	.stop0 = sd_stop0,
	.pkt_scan = sd_pkt_scan,
	.dq_callback = do_autogain,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.set_register = sd_dbg_s_register,
#endif
#if IS_ENABLED(CONFIG_INPUT)
	.int_pkt_scan = sd_int_pkt_scan,
#endif
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
	{USB_DEVICE(0x06f8, 0x3009)},
	{USB_DEVICE(0x06f8, 0x301b)},
	{USB_DEVICE(0x093a, 0x2620)},
	{USB_DEVICE(0x093a, 0x2621)},
	{USB_DEVICE(0x093a, 0x2622), .driver_info = FL_VFLIP},
	{USB_DEVICE(0x093a, 0x2623), .driver_info = FL_VFLIP},
	{USB_DEVICE(0x093a, 0x2624), .driver_info = FL_VFLIP},
	{USB_DEVICE(0x093a, 0x2625)},
	{USB_DEVICE(0x093a, 0x2626)},
	{USB_DEVICE(0x093a, 0x2627), .driver_info = FL_VFLIP},
	{USB_DEVICE(0x093a, 0x2628)},
	{USB_DEVICE(0x093a, 0x2629), .driver_info = FL_VFLIP},
	{USB_DEVICE(0x093a, 0x262a)},
	{USB_DEVICE(0x093a, 0x262c)},
	{USB_DEVICE(0x145f, 0x013c)},
	{USB_DEVICE(0x1ae7, 0x2001)}, /* SpeedLink Snappy Mic SL-6825-SBK */
	{}
};
MODULE_DEVICE_TABLE(usb, device_table);

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
			const struct usb_device_id *id)
{
	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
				THIS_MODULE);
}

static struct usb_driver sd_driver = {
	.name = KBUILD_MODNAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
	.reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);