aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/gspca/mr97310a.c
blob: 140c8f320e4782b83b39342b064c877d26eb85d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
/*
 * Mars MR97310A library
 *
 * Copyright (C) 2009 Kyle Guinn <elyk03@gmail.com>
 *
 * Support for the MR97310A cameras in addition to the Aiptek Pencam VGA+
 * and for the routines for detecting and classifying these various cameras,
 *
 * Copyright (C) 2009 Theodore Kilgore <kilgota@auburn.edu>
 *
 * Acknowledgements:
 *
 * The MR97311A support in gspca/mars.c has been helpful in understanding some
 * of the registers in these cameras.
 *
 * Hans de Goede <hdgoede@redhat.com> and
 * Thomas Kaiser <thomas@kaiser-linux.li>
 * have assisted with their experience. Each of them has also helped by
 * testing a previously unsupported camera.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define MODULE_NAME "mr97310a"

#include "gspca.h"

#define CAM_TYPE_CIF			0
#define CAM_TYPE_VGA			1

#define MR97310A_BRIGHTNESS_MIN		-254
#define MR97310A_BRIGHTNESS_MAX		255
#define MR97310A_BRIGHTNESS_DEFAULT	0

#define MR97310A_EXPOSURE_MIN		300
#define MR97310A_EXPOSURE_MAX		4095
#define MR97310A_EXPOSURE_DEFAULT	1000

#define MR97310A_GAIN_MIN		0
#define MR97310A_GAIN_MAX		31
#define MR97310A_GAIN_DEFAULT		25

MODULE_AUTHOR("Kyle Guinn <elyk03@gmail.com>,"
	      "Theodore Kilgore <kilgota@auburn.edu>");
MODULE_DESCRIPTION("GSPCA/Mars-Semi MR97310A USB Camera Driver");
MODULE_LICENSE("GPL");

/* global parameters */
int force_sensor_type = -1;
module_param(force_sensor_type, int, 0644);
MODULE_PARM_DESC(force_sensor_type, "Force sensor type (-1 (auto), 0 or 1)");

/* specific webcam descriptor */
struct sd {
	struct gspca_dev gspca_dev;  /* !! must be the first item */
	u8 sof_read;
	u8 cam_type;	/* 0 is CIF and 1 is VGA */
	u8 sensor_type;	/* We use 0 and 1 here, too. */
	u8 do_lcd_stop;

	int brightness;
	u16 exposure;
	u8 gain;
};

struct sensor_w_data {
	u8 reg;
	u8 flags;
	u8 data[16];
	int len;
};

static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val);
static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val);
static void setbrightness(struct gspca_dev *gspca_dev);
static void setexposure(struct gspca_dev *gspca_dev);
static void setgain(struct gspca_dev *gspca_dev);

/* V4L2 controls supported by the driver */
static struct ctrl sd_ctrls[] = {
	{
#define BRIGHTNESS_IDX 0
		{
			.id = V4L2_CID_BRIGHTNESS,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Brightness",
			.minimum = MR97310A_BRIGHTNESS_MIN,
			.maximum = MR97310A_BRIGHTNESS_MAX,
			.step = 1,
			.default_value = MR97310A_BRIGHTNESS_DEFAULT,
			.flags = 0,
		},
		.set = sd_setbrightness,
		.get = sd_getbrightness,
	},
	{
#define EXPOSURE_IDX 1
		{
			.id = V4L2_CID_EXPOSURE,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Exposure",
			.minimum = MR97310A_EXPOSURE_MIN,
			.maximum = MR97310A_EXPOSURE_MAX,
			.step = 1,
			.default_value = MR97310A_EXPOSURE_DEFAULT,
			.flags = 0,
		},
		.set = sd_setexposure,
		.get = sd_getexposure,
	},
	{
#define GAIN_IDX 2
		{
			.id = V4L2_CID_GAIN,
			.type = V4L2_CTRL_TYPE_INTEGER,
			.name = "Gain",
			.minimum = MR97310A_GAIN_MIN,
			.maximum = MR97310A_GAIN_MAX,
			.step = 1,
			.default_value = MR97310A_GAIN_DEFAULT,
			.flags = 0,
		},
		.set = sd_setgain,
		.get = sd_getgain,
	},
};

static const struct v4l2_pix_format vga_mode[] = {
	{160, 120, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 160,
		.sizeimage = 160 * 120,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 4},
	{176, 144, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 176,
		.sizeimage = 176 * 144,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 3},
	{320, 240, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 320,
		.sizeimage = 320 * 240,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 2},
	{352, 288, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 352,
		.sizeimage = 352 * 288,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 1},
	{640, 480, V4L2_PIX_FMT_MR97310A, V4L2_FIELD_NONE,
		.bytesperline = 640,
		.sizeimage = 640 * 480,
		.colorspace = V4L2_COLORSPACE_SRGB,
		.priv = 0},
};

/* the bytes to write are in gspca_dev->usb_buf */
static int mr_write(struct gspca_dev *gspca_dev, int len)
{
	int rc;

	rc = usb_bulk_msg(gspca_dev->dev,
			  usb_sndbulkpipe(gspca_dev->dev, 4),
			  gspca_dev->usb_buf, len, NULL, 500);
	if (rc < 0)
		PDEBUG(D_ERR, "reg write [%02x] error %d",
		       gspca_dev->usb_buf[0], rc);
	return rc;
}

/* the bytes are read into gspca_dev->usb_buf */
static int mr_read(struct gspca_dev *gspca_dev, int len)
{
	int rc;

	rc = usb_bulk_msg(gspca_dev->dev,
			  usb_rcvbulkpipe(gspca_dev->dev, 3),
			  gspca_dev->usb_buf, len, NULL, 500);
	if (rc < 0)
		PDEBUG(D_ERR, "reg read [%02x] error %d",
		       gspca_dev->usb_buf[0], rc);
	return rc;
}

static int sensor_write_reg(struct gspca_dev *gspca_dev, u8 reg, u8 flags,
	const u8 *data, int len)
{
	gspca_dev->usb_buf[0] = 0x1f;
	gspca_dev->usb_buf[1] = flags;
	gspca_dev->usb_buf[2] = reg;
	memcpy(gspca_dev->usb_buf + 3, data, len);

	return mr_write(gspca_dev, len + 3);
}

static int sensor_write_regs(struct gspca_dev *gspca_dev,
	const struct sensor_w_data *data, int len)
{
	int i, rc;

	for (i = 0; i < len; i++) {
		rc = sensor_write_reg(gspca_dev, data[i].reg, data[i].flags,
					  data[i].data, data[i].len);
		if (rc < 0)
			return rc;
	}

	return 0;
}

static int sensor_write1(struct gspca_dev *gspca_dev, u8 reg, u8 data)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 buf, confirm_reg;
	int rc;

	buf = data;
	rc = sensor_write_reg(gspca_dev, reg, 0x01, &buf, 1);
	if (rc < 0)
		return rc;

	buf = 0x01;
	confirm_reg = sd->sensor_type ? 0x13 : 0x11;
	rc = sensor_write_reg(gspca_dev, confirm_reg, 0x00, &buf, 1);
	if (rc < 0)
		return rc;

	return 0;
}

static int cam_get_response16(struct gspca_dev *gspca_dev)
{
	__u8 *data = gspca_dev->usb_buf;
	int err_code;

	data[0] = 0x21;
	err_code = mr_write(gspca_dev, 1);
	if (err_code < 0)
		return err_code;

	err_code = mr_read(gspca_dev, 16);
	return err_code;
}

static int zero_the_pointer(struct gspca_dev *gspca_dev)
{
	__u8 *data = gspca_dev->usb_buf;
	int err_code;
	u8 status = 0;
	int tries = 0;

	err_code = cam_get_response16(gspca_dev);
	if (err_code < 0)
		return err_code;

	err_code = mr_write(gspca_dev, 1);
	data[0] = 0x19;
	data[1] = 0x51;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	err_code = cam_get_response16(gspca_dev);
	if (err_code < 0)
		return err_code;

	data[0] = 0x19;
	data[1] = 0xba;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	err_code = cam_get_response16(gspca_dev);
	if (err_code < 0)
		return err_code;

	data[0] = 0x19;
	data[1] = 0x00;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	err_code = cam_get_response16(gspca_dev);
	if (err_code < 0)
		return err_code;

	data[0] = 0x19;
	data[1] = 0x00;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	while (status != 0x0a && tries < 256) {
		err_code = cam_get_response16(gspca_dev);
		status = data[0];
		tries++;
		if (err_code < 0)
			return err_code;
	}
	if (status != 0x0a)
		PDEBUG(D_ERR, "status is %02x", status);

	tries = 0;
	while (tries < 4) {
		data[0] = 0x19;
		data[1] = 0x00;
		err_code = mr_write(gspca_dev, 2);
		if (err_code < 0)
			return err_code;

		err_code = cam_get_response16(gspca_dev);
		status = data[0];
		tries++;
		if (err_code < 0)
			return err_code;
	}

	data[0] = 0x19;
	err_code = mr_write(gspca_dev, 1);
	if (err_code < 0)
		return err_code;

	err_code = mr_read(gspca_dev, 16);
	if (err_code < 0)
		return err_code;

	return 0;
}

static u8 get_sensor_id(struct gspca_dev *gspca_dev)
{
	int err_code;

	gspca_dev->usb_buf[0] = 0x1e;
	err_code = mr_write(gspca_dev, 1);
	if (err_code < 0)
		return err_code;

	err_code = mr_read(gspca_dev, 16);
	if (err_code < 0)
		return err_code;

	PDEBUG(D_PROBE, "Byte zero reported is %01x", gspca_dev->usb_buf[0]);

	return gspca_dev->usb_buf[0];
}

/* this function is called at probe time */
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;
	__u8 *data = gspca_dev->usb_buf;
	int err_code;

	cam = &gspca_dev->cam;
	cam->cam_mode = vga_mode;
	cam->nmodes = ARRAY_SIZE(vga_mode);

	if (id->idProduct == 0x010e) {
		sd->cam_type = CAM_TYPE_CIF;
		cam->nmodes--;

		data[0] = 0x01;
		data[1] = 0x01;
		err_code = mr_write(gspca_dev, 2);
		if (err_code < 0)
			return err_code;

		msleep(200);
		data[0] = get_sensor_id(gspca_dev);
		/*
		 * Known CIF cameras. If you have another to report, please do
		 *
		 * Name			byte just read		sd->sensor_type
		 *					reported by
		 * Sakar Spy-shot	0x28		T. Kilgore	0
		 * Innovage		0xf5 (unstable)	T. Kilgore	0
		 * Vivitar Mini		0x53		H. De Goede	0
		 * Vivitar Mini		0x04 / 0x24	E. Rodriguez	0
		 * Vivitar Mini		0x08		T. Kilgore	1
		 * Elta-Media 8212dc	0x23		T. Kaiser	1
		 * Philips dig. keych.	0x37		T. Kilgore	1
		 */
		if ((data[0] & 0x78) == 8 ||
		    ((data[0] & 0x2) == 0x2 && data[0] != 0x53))
			sd->sensor_type = 1;
		else
			sd->sensor_type = 0;

		PDEBUG(D_PROBE, "MR97310A CIF camera detected, sensor: %d",
		       sd->sensor_type);

		if (force_sensor_type != -1) {
			sd->sensor_type = !! force_sensor_type;
			PDEBUG(D_PROBE, "Forcing sensor type to: %d",
			       sd->sensor_type);
		}

		if (sd->sensor_type == 0)
			gspca_dev->ctrl_dis = (1 << BRIGHTNESS_IDX);
	} else {
		sd->cam_type = CAM_TYPE_VGA;
		PDEBUG(D_PROBE, "MR97310A VGA camera detected");
		gspca_dev->ctrl_dis = (1 << BRIGHTNESS_IDX) |
				      (1 << EXPOSURE_IDX) | (1 << GAIN_IDX);
	}

	sd->brightness = MR97310A_BRIGHTNESS_DEFAULT;
	sd->exposure = MR97310A_EXPOSURE_DEFAULT;
	sd->gain = MR97310A_GAIN_DEFAULT;

	return 0;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
	return 0;
}

static int start_cif_cam(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	__u8 *data = gspca_dev->usb_buf;
	int err_code;
	const __u8 startup_string[] = {
		0x00,
		0x0d,
		0x01,
		0x00, /* Hsize/8 for 352 or 320 */
		0x00, /* Vsize/4 for 288 or 240 */
		0x13, /* or 0xbb, depends on sensor */
		0x00, /* Hstart, depends on res. */
		0x00, /* reserved ? */
		0x00, /* Vstart, depends on res. and sensor */
		0x50, /* 0x54 to get 176 or 160 */
		0xc0
	};

	/* Note: Some of the above descriptions guessed from MR97113A driver */
	data[0] = 0x01;
	data[1] = 0x01;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	memcpy(data, startup_string, 11);
	if (sd->sensor_type)
		data[5] = 0xbb;

	switch (gspca_dev->width) {
	case 160:
		data[9] |= 0x04;  /* reg 8, 2:1 scale down from 320 */
		/* fall thru */
	case 320:
	default:
		data[3] = 0x28;			   /* reg 2, H size/8 */
		data[4] = 0x3c;			   /* reg 3, V size/4 */
		data[6] = 0x14;			   /* reg 5, H start  */
		data[8] = 0x1a + sd->sensor_type;  /* reg 7, V start  */
		break;
	case 176:
		data[9] |= 0x04;  /* reg 8, 2:1 scale down from 352 */
		/* fall thru */
	case 352:
		data[3] = 0x2c;			   /* reg 2, H size/8 */
		data[4] = 0x48;			   /* reg 3, V size/4 */
		data[6] = 0x06;			   /* reg 5, H start  */
		data[8] = 0x06 + sd->sensor_type;  /* reg 7, V start  */
		break;
	}
	err_code = mr_write(gspca_dev, 11);
	if (err_code < 0)
		return err_code;

	if (!sd->sensor_type) {
		const struct sensor_w_data cif_sensor0_init_data[] = {
			{0x02, 0x00, {0x03, 0x5a, 0xb5, 0x01,
				      0x0f, 0x14, 0x0f, 0x10}, 8},
			{0x0c, 0x00, {0x04, 0x01, 0x01, 0x00, 0x1f}, 5},
			{0x12, 0x00, {0x07}, 1},
			{0x1f, 0x00, {0x06}, 1},
			{0x27, 0x00, {0x04}, 1},
			{0x29, 0x00, {0x0c}, 1},
			{0x40, 0x00, {0x40, 0x00, 0x04}, 3},
			{0x50, 0x00, {0x60}, 1},
			{0x60, 0x00, {0x06}, 1},
			{0x6b, 0x00, {0x85, 0x85, 0xc8, 0xc8, 0xc8, 0xc8}, 6},
			{0x72, 0x00, {0x1e, 0x56}, 2},
			{0x75, 0x00, {0x58, 0x40, 0xa2, 0x02, 0x31, 0x02,
				      0x31, 0x80, 0x00}, 9},
			{0x11, 0x00, {0x01}, 1},
			{0, 0, {0}, 0}
		};
		err_code = sensor_write_regs(gspca_dev, cif_sensor0_init_data,
					 ARRAY_SIZE(cif_sensor0_init_data));
	} else {	/* sd->sensor_type = 1 */
		const struct sensor_w_data cif_sensor1_init_data[] = {
			/* Reg 3,4, 7,8 get set by the controls */
			{0x02, 0x00, {0x10}, 1},
			{0x05, 0x01, {0x22}, 1}, /* 5/6 also seen as 65h/32h */
			{0x06, 0x01, {0x00}, 1},
			{0x09, 0x02, {0x0e}, 1},
			{0x0a, 0x02, {0x05}, 1},
			{0x0b, 0x02, {0x05}, 1},
			{0x0c, 0x02, {0x0f}, 1},
			{0x0d, 0x02, {0x07}, 1},
			{0x0e, 0x02, {0x0c}, 1},
			{0x0f, 0x00, {0x00}, 1},
			{0x10, 0x00, {0x06}, 1},
			{0x11, 0x00, {0x07}, 1},
			{0x12, 0x00, {0x00}, 1},
			{0x13, 0x00, {0x01}, 1},
			{0, 0, {0}, 0}
		};
		err_code = sensor_write_regs(gspca_dev, cif_sensor1_init_data,
					 ARRAY_SIZE(cif_sensor1_init_data));
	}
	if (err_code < 0)
		return err_code;

	setbrightness(gspca_dev);
	setexposure(gspca_dev);
	setgain(gspca_dev);

	msleep(200);

	data[0] = 0x00;
	data[1] = 0x4d;  /* ISOC transfering enable... */
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	return 0;
}

static int start_vga_cam(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	__u8 *data = gspca_dev->usb_buf;
	int err_code;
	const __u8 startup_string[] = {0x00, 0x0d, 0x01, 0x00, 0x00, 0x2b,
				       0x00, 0x00, 0x00, 0x50, 0xc0};

	/* What some of these mean is explained in start_cif_cam(), above */
	sd->sof_read = 0;

	/*
	 * We have to know which camera we have, because the register writes
	 * depend upon the camera. This test, run before we actually enter
	 * the initialization routine, distinguishes most of the cameras, If
	 * needed, another routine is done later, too.
	 */
	memset(data, 0, 16);
	data[0] = 0x20;
	err_code = mr_write(gspca_dev, 1);
	if (err_code < 0)
		return err_code;

	err_code = mr_read(gspca_dev, 16);
	if (err_code < 0)
		return err_code;

	PDEBUG(D_PROBE, "Byte reported is %02x", data[0]);

	msleep(200);
	/*
	 * Known VGA cameras. If you have another to report, please do
	 *
	 * Name			byte just read		sd->sensor_type
	 *				sd->do_lcd_stop
	 * Aiptek Pencam VGA+	0x31		0	1
	 * ION digital		0x31		0	1
	 * Argus DC-1620	0x30		1	0
	 * Argus QuickClix	0x30		1	1 (not caught here)
	 */
	sd->sensor_type = data[0] & 1;
	sd->do_lcd_stop = (~data[0]) & 1;



	/* Streaming setup begins here. */


	data[0] = 0x01;
	data[1] = 0x01;
	err_code = mr_write(gspca_dev, 2);
	if (err_code < 0)
		return err_code;

	/*
	 * A second test can now resolve any remaining ambiguity in the
	 * identification of the camera type,
	 */
	if (!sd->sensor_type) {
		data[0] = get_sensor_id(gspca_dev);
		if (data[0] == 0x7f) {
			sd->sensor_type = 1;
			PDEBUG(D_PROBE, "sensor_type corrected to 1");
		}
		msleep(200);
	}

	if (force_sensor_type != -1) {
		sd->sensor_type = !! force_sensor_type;
		PDEBUG(D_PROBE, "Forcing sensor type to: %d",
		       sd->sensor_type);
	}

	/*
	 * Known VGA cameras.
	 * This test is only run if the previous test returned 0x30, but
	 * here is the information for all others, too, just for reference.
	 *
	 * Name			byte just read		sd->sensor_type
	 *
	 * Aiptek Pencam VGA+	0xfb	(this test not run)	1
	 * ION digital		0xbd	(this test not run)	1
	 * Argus DC-1620	0xe5	(no change)		0
	 * Argus QuickClix	0x7f	(reclassified)		1
	 */
	memcpy(data, startup_string, 11);
	if (!sd->sensor_type) {
		data[5]  = 0x00;
		data[10] = 0x91;
	}

	switch (gspca_dev->width) {
	case 160:
		data[9] |= 0x0c;  /* reg 8, 4:1 scale down */
		/* fall thru */
	case 320:
		data[9] |= 0x04;  /* reg 8, 2:1 scale down */
		/* fall thru */
	case 640:
	default:
		data[3] = 0x50;  /* reg 2, H size/8 */
		data[4] = 0x78;  /* reg 3, V size/4 */
		data[6] = 0x04;  /* reg 5, H start */
		data[8] = 0x03;  /* reg 7, V start */
		if (sd->do_lcd_stop)
			data[8] = 0x04;  /* Bayer tile shifted */
		break;

	case 176:
		data[9] |= 0x04;  /* reg 8, 2:1 scale down */
		/* fall thru */
	case 352:
		data[3] = 0x2c;  /* reg 2, H size */
		data[4] = 0x48;  /* reg 3, V size */
		data[6] = 0x94;  /* reg 5, H start */
		data[8] = 0x63;  /* reg 7, V start */
		if (sd->do_lcd_stop)
			data[8] = 0x64;  /* Bayer tile shifted */
		break;
	}

	err_code = mr_write(gspca_dev, 11);
	if (err_code < 0)
		return err_code;

	if (!sd->sensor_type) {
		/* The only known sensor_type 0 cam is the Argus DC-1620 */
		const struct sensor_w_data vga_sensor0_init_data[] = {
			{0x01, 0x00, {0x0c, 0x00, 0x04}, 3},
			{0x14, 0x00, {0x01, 0xe4, 0x02, 0x84}, 4},
			{0x20, 0x00, {0x00, 0x80, 0x00, 0x08}, 4},
			{0x25, 0x00, {0x03, 0xa9, 0x80}, 3},
			{0x30, 0x00, {0x30, 0x18, 0x10, 0x18}, 4},
			{0, 0, {0}, 0}
		};
		err_code = sensor_write_regs(gspca_dev, vga_sensor0_init_data,
					 ARRAY_SIZE(vga_sensor0_init_data));
	} else {	/* sd->sensor_type = 1 */
		const struct sensor_w_data vga_sensor1_init_data[] = {
			{0x02, 0x00, {0x06, 0x59, 0x0c, 0x16, 0x00,
				0x07, 0x00, 0x01}, 8},
			{0x11, 0x04, {0x01}, 1},
			/*{0x0a, 0x00, {0x00, 0x01, 0x00, 0x00, 0x01, */
			{0x0a, 0x00, {0x01, 0x06, 0x00, 0x00, 0x01,
				0x00, 0x0a}, 7},
			{0x11, 0x04, {0x01}, 1},
			{0x12, 0x00, {0x00, 0x63, 0x00, 0x70, 0x00, 0x00}, 6},
			{0x11, 0x04, {0x01}, 1},
			{0, 0, {0}, 0}
		};
		err_code = sensor_write_regs(gspca_dev, vga_sensor1_init_data,
					 ARRAY_SIZE(vga_sensor1_init_data));
	}
	if (err_code < 0)
		return err_code;

	msleep(200);
	data[0] = 0x00;
	data[1] = 0x4d;  /* ISOC transfering enable... */
	err_code = mr_write(gspca_dev, 2);

	return err_code;
}

static int sd_start(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int err_code;
	struct cam *cam;

	cam = &gspca_dev->cam;
	sd->sof_read = 0;
	/*
	 * Some of the supported cameras require the memory pointer to be
	 * set to 0, or else they will not stream.
	 */
	zero_the_pointer(gspca_dev);
	msleep(200);
	if (sd->cam_type == CAM_TYPE_CIF) {
		err_code = start_cif_cam(gspca_dev);
	} else {
		err_code = start_vga_cam(gspca_dev);
	}
	return err_code;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	int result;

	gspca_dev->usb_buf[0] = 1;
	gspca_dev->usb_buf[1] = 0;
	result = mr_write(gspca_dev, 2);
	if (result < 0)
		PDEBUG(D_ERR, "Camera Stop failed");

	/* Not all the cams need this, but even if not, probably a good idea */
	zero_the_pointer(gspca_dev);
	if (sd->do_lcd_stop) {
		gspca_dev->usb_buf[0] = 0x19;
		gspca_dev->usb_buf[1] = 0x54;
		result = mr_write(gspca_dev, 2);
		if (result < 0)
			PDEBUG(D_ERR, "Camera Stop failed");
	}
}

static void setbrightness(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 val;

	if (gspca_dev->ctrl_dis & (1 << BRIGHTNESS_IDX))
		return;

	/* Note register 7 is also seen as 0x8x or 0xCx in dumps */
	if (sd->brightness > 0) {
		sensor_write1(gspca_dev, 7, 0x00);
		val = sd->brightness;
	} else {
		sensor_write1(gspca_dev, 7, 0x01);
		val = 257 - sd->brightness;
	}
	sensor_write1(gspca_dev, 8, val);
}

static void setexposure(struct gspca_dev *gspca_dev)
{
	struct sd *sd = (struct sd *) gspca_dev;
	u8 val;

	if (gspca_dev->ctrl_dis & (1 << EXPOSURE_IDX))
		return;

	if (sd->sensor_type) {
		val = sd->exposure >> 4;
		sensor_write1(gspca_dev, 3, val);
		val = sd->exposure & 0xf;
		sensor_write1(gspca_dev, 4, val);
	} else {
		u8 clockdiv;
		int exposure;

		/* We have both a clock divider and an exposure register.
		   We first calculate the clock divider, as that determines
		   the maximum exposure and then we calculayte the exposure
		   register setting (which goes from 0 - 511).

		   Note our 0 - 4095 exposure is mapped to 0 - 511
		   milliseconds exposure time */
		clockdiv = (60 * sd->exposure + 7999) / 8000;

		/* Limit framerate to not exceed usb bandwidth */
		if (clockdiv < 3 && gspca_dev->width >= 320)
			clockdiv = 3;
		else if (clockdiv < 2)
			clockdiv = 2;

		/* Frame exposure time in ms = 1000 * clockdiv / 60 ->
		exposure = (sd->exposure / 8) * 511 / (1000 * clockdiv / 60) */
		exposure = (60 * 511 * sd->exposure) / (8000 * clockdiv);
		if (exposure > 511)
			exposure = 511;

		/* exposure register value is reversed! */
		exposure = 511 - exposure;

		sensor_write1(gspca_dev, 0x02, clockdiv);
		sensor_write1(gspca_dev, 0x0e, exposure & 0xff);
		sensor_write1(gspca_dev, 0x0f, exposure >> 8);
	}
}

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

	if (gspca_dev->ctrl_dis & (1 << GAIN_IDX))
		return;

	if (sd->sensor_type) {
		sensor_write1(gspca_dev, 0x0e, sd->gain);
	} else {
		sensor_write1(gspca_dev, 0x10, sd->gain);
	}
}

static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->brightness = val;
	if (gspca_dev->streaming)
		setbrightness(gspca_dev);
	return 0;
}

static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->brightness;
	return 0;
}

static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->exposure = val;
	if (gspca_dev->streaming)
		setexposure(gspca_dev);
	return 0;
}

static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->exposure;
	return 0;
}

static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	sd->gain = val;
	if (gspca_dev->streaming)
		setgain(gspca_dev);
	return 0;
}

static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val)
{
	struct sd *sd = (struct sd *) gspca_dev;

	*val = sd->gain;
	return 0;
}

/* Include pac common sof detection functions */
#include "pac_common.h"

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
			struct gspca_frame *frame,    /* target */
			__u8 *data,                   /* isoc packet */
			int len)                      /* iso packet length */
{
	unsigned char *sof;

	sof = pac_find_sof(gspca_dev, data, len);
	if (sof) {
		int n;

		/* finish decoding current frame */
		n = sof - data;
		if (n > sizeof pac_sof_marker)
			n -= sizeof pac_sof_marker;
		else
			n = 0;
		frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame,
					data, n);
		/* Start next frame. */
		gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
			pac_sof_marker, sizeof pac_sof_marker);
		len -= sof - data;
		data = sof;
	}
	gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
}

/* sub-driver description */
static const struct sd_desc sd_desc = {
	.name = MODULE_NAME,
	.ctrls = sd_ctrls,
	.nctrls = ARRAY_SIZE(sd_ctrls),
	.config = sd_config,
	.init = sd_init,
	.start = sd_start,
	.stopN = sd_stopN,
	.pkt_scan = sd_pkt_scan,
};

/* -- module initialisation -- */
static const __devinitdata struct usb_device_id device_table[] = {
	{USB_DEVICE(0x08ca, 0x0111)},	/* Aiptek Pencam VGA+ */
	{USB_DEVICE(0x093a, 0x010f)},	/* All other known MR97310A VGA cams */
	{USB_DEVICE(0x093a, 0x010e)},	/* All known MR97310A CIF cams */
	{}
};
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 = MODULE_NAME,
	.id_table = device_table,
	.probe = sd_probe,
	.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
	.suspend = gspca_suspend,
	.resume = gspca_resume,
#endif
};

/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
	int ret;

	ret = usb_register(&sd_driver);
	if (ret < 0)
		return ret;
	PDEBUG(D_PROBE, "registered");
	return 0;
}
static void __exit sd_mod_exit(void)
{
	usb_deregister(&sd_driver);
	PDEBUG(D_PROBE, "deregistered");
}

module_init(sd_mod_init);
module_exit(sd_mod_exit);