aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/usbvideo/quickcam_messenger.c
blob: a2acba0bcc47586163bd4d82dffa91340354251b (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
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
/*
 * Driver for Logitech Quickcam Messenger usb video camera
 * Copyright (C) Jaya Kumar
 *
 * This work was sponsored by CIS(M) Sdn Bhd.
 * History:
 * 05/08/2006 - Jaya Kumar
 * I wrote this based on the konicawc by Simon Evans.
 * -
 * Full credit for reverse engineering and creating an initial
 * working linux driver for the VV6422 goes to the qce-ga project by
 * Tuukka Toivonen, Jochen Hoenicke, Peter McConnell,
 * Cristiano De Michele, Georg Acher, Jean-Frederic Clere as well as
 * others.
 * ---
 * 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
 * (at your option) 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
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/usb/input.h>

#include "usbvideo.h"
#include "quickcam_messenger.h"

/*
 * Version Information
 */

#ifdef CONFIG_USB_DEBUG
static int debug;
#define DEBUG(n, format, arg...) \
	if (n <= debug) {	 \
		printk(KERN_DEBUG __FILE__ ":%s(): " format "\n", __FUNCTION__ , ## arg); \
	}
#else
#define DEBUG(n, arg...)
static const int debug = 0;
#endif

#define DRIVER_VERSION "v0.01"
#define DRIVER_DESC "Logitech Quickcam Messenger USB"

#define USB_LOGITECH_VENDOR_ID	0x046D
#define USB_QCM_PRODUCT_ID	0x08F0

#define MAX_CAMERAS	1

#define MAX_COLOUR	32768
#define MAX_HUE		32768
#define MAX_BRIGHTNESS	32768
#define MAX_CONTRAST	32768
#define MAX_WHITENESS	32768

static int size = SIZE_320X240;
static int colour = MAX_COLOUR;
static int hue = MAX_HUE;
static int brightness =	MAX_BRIGHTNESS;
static int contrast =	MAX_CONTRAST;
static int whiteness =	MAX_WHITENESS;

static struct usbvideo *cams;

static struct usb_device_id qcm_table [] = {
	{ USB_DEVICE(USB_LOGITECH_VENDOR_ID, USB_QCM_PRODUCT_ID) },
	{ }
};
MODULE_DEVICE_TABLE(usb, qcm_table);

#ifdef CONFIG_INPUT
static void qcm_register_input(struct qcm *cam, struct usb_device *dev)
{
	struct input_dev *input_dev;
	int error;

	usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));
	strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));

	cam->input = input_dev = input_allocate_device();
	if (!input_dev) {
		warn("insufficient mem for cam input device");
		return;
	}

	input_dev->name = "QCM button";
	input_dev->phys = cam->input_physname;
	usb_to_input_id(dev, &input_dev->id);
	input_dev->dev.parent = &dev->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	input_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);

	error = input_register_device(cam->input);
	if (error) {
		warn("Failed to register camera's input device, err: %d\n",
		     error);
		input_free_device(cam->input);
		cam->input = NULL;
	}
}

static void qcm_unregister_input(struct qcm *cam)
{
	if (cam->input) {
		input_unregister_device(cam->input);
		cam->input = NULL;
	}
}

static void qcm_report_buttonstat(struct qcm *cam)
{
	if (cam->input) {
		input_report_key(cam->input, BTN_0, cam->button_sts);
		input_sync(cam->input);
	}
}

static void qcm_int_irq(struct urb *urb)
{
	int ret;
	struct uvd *uvd = urb->context;
	struct qcm *cam;

	if (!CAMERA_IS_OPERATIONAL(uvd))
		return;

	if (!uvd->streaming)
		return;

	uvd->stats.urb_count++;

	if (urb->status < 0)
		uvd->stats.iso_err_count++;
	else {
		if (urb->actual_length > 0 ) {
			cam = (struct qcm *) uvd->user_data;
			if (cam->button_sts_buf == 0x88)
				cam->button_sts = 0x0;
			else if (cam->button_sts_buf == 0x80)
				cam->button_sts = 0x1;
			qcm_report_buttonstat(cam);
		}
	}

	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret < 0)
		err("usb_submit_urb error (%d)", ret);
}

static int qcm_setup_input_int(struct qcm *cam, struct uvd *uvd)
{
	int errflag;
	usb_fill_int_urb(cam->button_urb, uvd->dev,
			usb_rcvintpipe(uvd->dev, uvd->video_endp + 1),
			&cam->button_sts_buf,
			1,
			qcm_int_irq,
			uvd, 16);

	errflag = usb_submit_urb(cam->button_urb, GFP_KERNEL);
	if (errflag)
		err ("usb_submit_int ret %d", errflag);
	return errflag;
}

static void qcm_stop_int_data(struct qcm *cam)
{
	usb_kill_urb(cam->button_urb);
}

static int qcm_alloc_int_urb(struct qcm *cam)
{
	cam->button_urb = usb_alloc_urb(0, GFP_KERNEL);

	if (!cam->button_urb)
		return -ENOMEM;

	return 0;
}

static void qcm_free_int(struct qcm *cam)
{
	usb_free_urb(cam->button_urb);
}
#endif /* CONFIG_INPUT */

static int qcm_stv_setb(struct usb_device *dev, u16 reg, u8 val)
{
	int ret;

	/* we'll wait up to 3 slices but no more */
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
		reg, 0, &val, 1, 3*HZ);
	return ret;
}

static int qcm_stv_setw(struct usb_device *dev, u16 reg, u16 val)
{
	int ret;

	/* we'll wait up to 3 slices but no more */
	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
		reg, 0, &val, 2, 3*HZ);
	return ret;
}

static int qcm_stv_getw(struct usb_device *dev, unsigned short reg,
							__le16 *val)
{
	int ret;

	/* we'll wait up to 3 slices but no more */
	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		0x04, USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
		reg, 0, val, 2, 3*HZ);
	return ret;
}

static int qcm_camera_on(struct uvd *uvd)
{
	int ret;
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x01));
	return 0;
}

static int qcm_camera_off(struct uvd *uvd)
{
	int ret;
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));
	return 0;
}

static void qcm_hsv2rgb(u16 hue, u16 sat, u16 val, u16 *r, u16 *g, u16 *b)
{
	unsigned int segment, valsat;
	signed int   h = (signed int) hue;
	unsigned int s = (sat - 32768) * 2;	/* rescale */
	unsigned int v = val;
	unsigned int p;

	/*
	the registers controlling gain are 8 bit of which
	we affect only the last 4 bits with our gain.
	we know that if saturation is 0, (unsaturated) then
	we're grayscale (center axis of the colour cone) so
	we set rgb=value. we use a formula obtained from
	wikipedia to map the cone to the RGB plane. it's
	as follows for the human value case of h=0..360,
	s=0..1, v=0..1
	h_i = h/60 % 6 , f = h/60 - h_i , p = v(1-s)
	q = v(1 - f*s) , t = v(1 - (1-f)s)
	h_i==0 => r=v , g=t, b=p
	h_i==1 => r=q , g=v, b=p
	h_i==2 => r=p , g=v, b=t
	h_i==3 => r=p , g=q, b=v
	h_i==4 => r=t , g=p, b=v
	h_i==5 => r=v , g=p, b=q
	the bottom side (the point) and the stuff just up
	of that is black so we simplify those two cases.
	*/
	if (sat < 32768) {
		/* anything less than this is unsaturated */
		*r = val;
		*g = val;
		*b = val;
		return;
	}
	if (val <= (0xFFFF/8)) {
		/* anything less than this is black */
		*r = 0;
		*g = 0;
		*b = 0;
		return;
	}

	/* the rest of this code is copying tukkat's
	implementation of the hsv2rgb conversion as taken
	from qc-usb-messenger code. the 10923 is 0xFFFF/6
	to divide the cone into 6 sectors.  */

	segment = (h + 10923) & 0xFFFF;
	segment = segment*3 >> 16;		/* 0..2: 0=R, 1=G, 2=B */
	hue -= segment * 21845;			/* -10923..10923 */
	h = hue;
	h *= 3;
	valsat = v*s >> 16;			/* 0..65534 */
	p = v - valsat;
	if (h >= 0) {
		unsigned int t = v - (valsat * (32769 - h) >> 15);
		switch (segment) {
		case 0:	/* R-> */
			*r = v;
			*g = t;
			*b = p;
			break;
		case 1:	/* G-> */
			*r = p;
			*g = v;
			*b = t;
			break;
		case 2:	/* B-> */
			*r = t;
			*g = p;
			*b = v;
			break;
		}
	} else {
		unsigned int q = v - (valsat * (32769 + h) >> 15);
		switch (segment) {
		case 0:	/* ->R */
			*r = v;
			*g = p;
			*b = q;
			break;
		case 1:	/* ->G */
			*r = q;
			*g = v;
			*b = p;
			break;
		case 2:	/* ->B */
			*r = p;
			*g = q;
			*b = v;
			break;
		}
	}
}

static int qcm_sensor_set_gains(struct uvd *uvd, u16 hue,
	u16 saturation, u16 value)
{
	int ret;
	u16 r=0,g=0,b=0;

	/* this code is based on qc-usb-messenger */
	qcm_hsv2rgb(hue, saturation, value, &r, &g, &b);

	r >>= 12;
	g >>= 12;
	b >>= 12;

	/* min val is 8 */
	r = max((u16) 8, r);
	g = max((u16) 8, g);
	b = max((u16) 8, b);

	r |= 0x30;
	g |= 0x30;
	b |= 0x30;

	/* set the r,g,b gain registers */
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x0509, r));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050A, g));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050B, b));

	/* doing as qc-usb did */
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050C, 0x2A));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050D, 0x01));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));

	return 0;
}

static int qcm_sensor_set_exposure(struct uvd *uvd, int exposure)
{
	int ret;
	int formedval;

	/* calculation was from qc-usb-messenger driver */
	formedval = ( exposure >> 12 );

	/* max value for formedval is 14 */
	formedval = min(formedval, 14);

	CHECK_RET(ret, qcm_stv_setb(uvd->dev,
			0x143A, 0xF0 | formedval));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
	return 0;
}

static int qcm_sensor_setlevels(struct uvd *uvd, int brightness, int contrast,
					int hue, int colour)
{
	int ret;
	/* brightness is exposure, contrast is gain, colour is saturation */
	CHECK_RET(ret,
		qcm_sensor_set_exposure(uvd, brightness));
	CHECK_RET(ret, qcm_sensor_set_gains(uvd, hue, colour, contrast));

	return 0;
}

static int qcm_sensor_setsize(struct uvd *uvd, u8 size)
{
	int ret;

	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x1505, size));
	return 0;
}

static int qcm_sensor_set_shutter(struct uvd *uvd, int whiteness)
{
	int ret;
	/* some rescaling as done by the qc-usb-messenger code */
	if (whiteness > 0xC000)
		whiteness = 0xC000 + (whiteness & 0x3FFF)*8;

	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143D,
				(whiteness >> 8) & 0xFF));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143E,
				(whiteness >> 16) & 0x03));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));

	return 0;
}

static int qcm_sensor_init(struct uvd *uvd)
{
	struct qcm *cam = (struct qcm *) uvd->user_data;
	int ret;
	int i;

	for (i=0; i < ARRAY_SIZE(regval_table) ; i++) {
		CHECK_RET(ret, qcm_stv_setb(uvd->dev,
					regval_table[i].reg,
					regval_table[i].val));
	}

	CHECK_RET(ret, qcm_stv_setw(uvd->dev, 0x15c1,
				cpu_to_le16(ISOC_PACKET_SIZE)));
	CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x15c3, 0x08));
	CHECK_RET(ret, ret = qcm_stv_setb(uvd->dev, 0x143f, 0x01));

	CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));

	CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));

	CHECK_RET(ret, qcm_sensor_setlevels(uvd, uvd->vpic.brightness,
			uvd->vpic.contrast, uvd->vpic.hue, uvd->vpic.colour));

	CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
	CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));

	return 0;
}

static int qcm_set_camera_size(struct uvd *uvd)
{
	int ret;
	struct qcm *cam = (struct qcm *) uvd->user_data;

	CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
	cam->width = camera_sizes[cam->size].width;
	cam->height = camera_sizes[cam->size].height;
	uvd->videosize = VIDEOSIZE(cam->width, cam->height);

	return 0;
}

static int qcm_setup_on_open(struct uvd *uvd)
{
	int ret;

	CHECK_RET(ret, qcm_sensor_set_gains(uvd, uvd->vpic.hue,
				uvd->vpic.colour, uvd->vpic.contrast));
	CHECK_RET(ret, qcm_sensor_set_exposure(uvd, uvd->vpic.brightness));
	CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
	CHECK_RET(ret, qcm_set_camera_size(uvd));
	CHECK_RET(ret, qcm_camera_on(uvd));
	return 0;
}

static void qcm_adjust_picture(struct uvd *uvd)
{
	int ret;
	struct qcm *cam = (struct qcm *) uvd->user_data;

	ret = qcm_camera_off(uvd);
	if (ret) {
		err("can't turn camera off. abandoning pic adjustment");
		return;
	}

	/* if there's been a change in contrast, hue, or
	colour then we need to recalculate hsv in order
	to update gains */
	if ((cam->contrast != uvd->vpic.contrast) ||
		(cam->hue != uvd->vpic.hue) ||
		(cam->colour != uvd->vpic.colour)) {
		cam->contrast = uvd->vpic.contrast;
		cam->hue = uvd->vpic.hue;
		cam->colour = uvd->vpic.colour;
		ret = qcm_sensor_set_gains(uvd, cam->hue, cam->colour,
						cam->contrast);
		if (ret) {
			err("can't set gains. abandoning pic adjustment");
			return;
		}
	}

	if (cam->brightness != uvd->vpic.brightness) {
		cam->brightness = uvd->vpic.brightness;
		ret = qcm_sensor_set_exposure(uvd, cam->brightness);
		if (ret) {
			err("can't set exposure. abandoning pic adjustment");
			return;
		}
	}

	if (cam->whiteness != uvd->vpic.whiteness) {
		cam->whiteness = uvd->vpic.whiteness;
		qcm_sensor_set_shutter(uvd, cam->whiteness);
		if (ret) {
			err("can't set shutter. abandoning pic adjustment");
			return;
		}
	}

	ret = qcm_camera_on(uvd);
	if (ret) {
		err("can't reenable camera. pic adjustment failed");
		return;
	}
}

static int qcm_process_frame(struct uvd *uvd, u8 *cdata, int framelen)
{
	int datalen;
	int totaldata;
	struct framehdr {
		__be16 id;
		__be16 len;
	};
	struct framehdr *fhdr;

	totaldata = 0;
	while (framelen) {
		fhdr = (struct framehdr *) cdata;
		datalen = be16_to_cpu(fhdr->len);
		framelen -= 4;
		cdata += 4;

		if ((fhdr->id) == cpu_to_be16(0x8001)) {
			RingQueue_Enqueue(&uvd->dp, marker, 4);
			totaldata += 4;
			continue;
		}
		if ((fhdr->id & cpu_to_be16(0xFF00)) == cpu_to_be16(0x0200)) {
			RingQueue_Enqueue(&uvd->dp, cdata, datalen);
			totaldata += datalen;
		}
		framelen -= datalen;
		cdata += datalen;
	}
	return totaldata;
}

static int qcm_compress_iso(struct uvd *uvd, struct urb *dataurb)
{
	int totlen;
	int i;
	unsigned char *cdata;

	totlen=0;
	for (i = 0; i < dataurb->number_of_packets; i++) {
		int n = dataurb->iso_frame_desc[i].actual_length;
		int st = dataurb->iso_frame_desc[i].status;

		cdata = dataurb->transfer_buffer +
			dataurb->iso_frame_desc[i].offset;

		if (st < 0) {
			warn("Data error: packet=%d. len=%d. status=%d.",
			      i, n, st);
			uvd->stats.iso_err_count++;
			continue;
		}
		if (!n)
			continue;

		totlen += qcm_process_frame(uvd, cdata, n);
	}
	return totlen;
}

static void resubmit_urb(struct uvd *uvd, struct urb *urb)
{
	int ret;

	urb->dev = uvd->dev;
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret)
		err("usb_submit_urb error (%d)", ret);
}

static void qcm_isoc_irq(struct urb *urb)
{
	int len;
	struct uvd *uvd = urb->context;

	if (!CAMERA_IS_OPERATIONAL(uvd))
		return;

	if (!uvd->streaming)
		return;

	uvd->stats.urb_count++;

	if (!urb->actual_length) {
		resubmit_urb(uvd, urb);
		return;
	}

	len = qcm_compress_iso(uvd, urb);
	resubmit_urb(uvd, urb);
	uvd->stats.urb_length = len;
	uvd->stats.data_count += len;
	if (len)
		RingQueue_WakeUpInterruptible(&uvd->dp);
}

static int qcm_start_data(struct uvd *uvd)
{
	struct qcm *cam = (struct qcm *) uvd->user_data;
	int i;
	int errflag;
	int pktsz;
	int err;

	pktsz = uvd->iso_packet_len;
	if (!CAMERA_IS_OPERATIONAL(uvd)) {
		err("Camera is not operational");
		return -EFAULT;
	}

	err = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltActive);
	if (err < 0) {
		err("usb_set_interface error");
		uvd->last_error = err;
		return -EBUSY;
	}

	for (i=0; i < USBVIDEO_NUMSBUF; i++) {
		int j, k;
		struct urb *urb = uvd->sbuf[i].urb;
		urb->dev = uvd->dev;
		urb->context = uvd;
		urb->pipe = usb_rcvisocpipe(uvd->dev, uvd->video_endp);
		urb->interval = 1;
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = uvd->sbuf[i].data;
		urb->complete = qcm_isoc_irq;
		urb->number_of_packets = FRAMES_PER_DESC;
		urb->transfer_buffer_length = pktsz * FRAMES_PER_DESC;
		for (j=k=0; j < FRAMES_PER_DESC; j++, k += pktsz) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length = pktsz;
		}
	}

	uvd->streaming = 1;
	uvd->curframe = -1;
	for (i=0; i < USBVIDEO_NUMSBUF; i++) {
		errflag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
		if (errflag)
			err ("usb_submit_isoc(%d) ret %d", i, errflag);
	}

	CHECK_RET(err, qcm_setup_input_int(cam, uvd));
	CHECK_RET(err, qcm_camera_on(uvd));
	return 0;
}

static void qcm_stop_data(struct uvd *uvd)
{
	struct qcm *cam = (struct qcm *) uvd->user_data;
	int i, j;
	int ret;

	if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
		return;

	ret = qcm_camera_off(uvd);
	if (ret)
		warn("couldn't turn the cam off.");

	uvd->streaming = 0;

	/* Unschedule all of the iso td's */
	for (i=0; i < USBVIDEO_NUMSBUF; i++)
		usb_kill_urb(uvd->sbuf[i].urb);

	qcm_stop_int_data(cam);

	if (!uvd->remove_pending) {
		/* Set packet size to 0 */
		j = usb_set_interface(uvd->dev, uvd->iface,
					uvd->ifaceAltInactive);
		if (j < 0) {
			err("usb_set_interface() error %d.", j);
			uvd->last_error = j;
		}
	}
}

static void qcm_process_isoc(struct uvd *uvd, struct usbvideo_frame *frame)
{
	struct qcm *cam = (struct qcm *) uvd->user_data;
	int x;
	struct rgb *rgbL0;
	struct rgb *rgbL1;
	struct bayL0 *bayL0;
	struct bayL1 *bayL1;
	int hor,ver,hordel,verdel;
	assert(frame != NULL);

	switch (cam->size) {
	case SIZE_160X120:
		hor = 162; ver = 124; hordel = 1; verdel = 2;
		break;
	case SIZE_320X240:
	default:
		hor = 324; ver = 248; hordel = 2; verdel = 4;
		break;
	}

	if (frame->scanstate == ScanState_Scanning) {
		while (RingQueue_GetLength(&uvd->dp) >=
			 4 + (hor*verdel + hordel)) {
			if ((RING_QUEUE_PEEK(&uvd->dp, 0) == 0x00) &&
			    (RING_QUEUE_PEEK(&uvd->dp, 1) == 0xff) &&
			    (RING_QUEUE_PEEK(&uvd->dp, 2) == 0x00) &&
			    (RING_QUEUE_PEEK(&uvd->dp, 3) == 0xff)) {
				frame->curline = 0;
				frame->scanstate = ScanState_Lines;
				frame->frameState = FrameState_Grabbing;
				RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 4);
			/*
			* if we're starting, we need to discard the first
			* 4 lines of y bayer data
			* and the first 2 gr elements of x bayer data
			*/
				RING_QUEUE_DEQUEUE_BYTES(&uvd->dp,
							(hor*verdel + hordel));
				break;
			}
			RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 1);
		}
	}

	if (frame->scanstate == ScanState_Scanning)
		return;

	/* now we can start processing bayer data so long as we have at least
	* 2 lines worth of data. this is the simplest demosaicing method that
	* I could think of. I use each 2x2 bayer element without interpolation
	* to generate 4 rgb pixels.
	*/
	while ( frame->curline < cam->height &&
		(RingQueue_GetLength(&uvd->dp) >= hor*2)) {
		/* get 2 lines of bayer for demosaicing
		 * into 2 lines of RGB */
		RingQueue_Dequeue(&uvd->dp, cam->scratch, hor*2);
		bayL0 = (struct bayL0 *) cam->scratch;
		bayL1 = (struct bayL1 *) (cam->scratch + hor);
		/* frame->curline is the rgb y line */
		rgbL0 = (struct rgb *)
				( frame->data + (cam->width*3*frame->curline));
		/* w/2 because we're already doing 2 pixels */
		rgbL1 = rgbL0 + (cam->width/2);

		for (x=0; x < cam->width; x+=2) {
			rgbL0->r = bayL0->r;
			rgbL0->g = bayL0->g;
			rgbL0->b = bayL1->b;

			rgbL0->r2 = bayL0->r;
			rgbL0->g2 = bayL1->g;
			rgbL0->b2 = bayL1->b;

			rgbL1->r = bayL0->r;
			rgbL1->g = bayL1->g;
			rgbL1->b = bayL1->b;

			rgbL1->r2 = bayL0->r;
			rgbL1->g2 = bayL1->g;
			rgbL1->b2 = bayL1->b;

			rgbL0++;
			rgbL1++;

			bayL0++;
			bayL1++;
		}

		frame->seqRead_Length += cam->width*3*2;
		frame->curline += 2;
	}
	/* See if we filled the frame */
	if (frame->curline == cam->height) {
		frame->frameState = FrameState_Done_Hold;
		frame->curline = 0;
		uvd->curframe = -1;
		uvd->stats.frame_num++;
	}
}

/* taken from konicawc */
static int qcm_set_video_mode(struct uvd *uvd, struct video_window *vw)
{
	int ret;
	int newsize;
	int oldsize;
	int x = vw->width;
	int y = vw->height;
	struct qcm *cam = (struct qcm *) uvd->user_data;

	if (x > 0 && y > 0) {
		DEBUG(2, "trying to find size %d,%d", x, y);
		for (newsize = 0; newsize <= MAX_FRAME_SIZE; newsize++) {
			if ((camera_sizes[newsize].width == x) &&
				(camera_sizes[newsize].height == y))
				break;
		}
	} else
		newsize = cam->size;

	if (newsize > MAX_FRAME_SIZE) {
		DEBUG(1, "couldn't find size %d,%d", x, y);
		return -EINVAL;
	}

	if (newsize == cam->size) {
		DEBUG(1, "Nothing to do");
		return 0;
	}

	qcm_stop_data(uvd);

	if (cam->size != newsize) {
		oldsize = cam->size;
		cam->size = newsize;
		ret = qcm_set_camera_size(uvd);
		if (ret) {
			err("Couldn't set camera size, err=%d",ret);
			/* restore the original size */
			cam->size = oldsize;
			return ret;
		}
	}

	/* Flush the input queue and clear any current frame in progress */

	RingQueue_Flush(&uvd->dp);
	if (uvd->curframe != -1) {
		uvd->frame[uvd->curframe].curline = 0;
		uvd->frame[uvd->curframe].seqRead_Length = 0;
		uvd->frame[uvd->curframe].seqRead_Index = 0;
	}

	CHECK_RET(ret, qcm_start_data(uvd));
	return 0;
}

static int qcm_configure_video(struct uvd *uvd)
{
	int ret;
	memset(&uvd->vpic, 0, sizeof(uvd->vpic));
	memset(&uvd->vpic_old, 0x55, sizeof(uvd->vpic_old));

	uvd->vpic.colour = colour;
	uvd->vpic.hue = hue;
	uvd->vpic.brightness = brightness;
	uvd->vpic.contrast = contrast;
	uvd->vpic.whiteness = whiteness;
	uvd->vpic.depth = 24;
	uvd->vpic.palette = VIDEO_PALETTE_RGB24;

	memset(&uvd->vcap, 0, sizeof(uvd->vcap));
	strcpy(uvd->vcap.name, "QCM USB Camera");
	uvd->vcap.type = VID_TYPE_CAPTURE;
	uvd->vcap.channels = 1;
	uvd->vcap.audios = 0;

	uvd->vcap.minwidth = camera_sizes[SIZE_160X120].width;
	uvd->vcap.minheight = camera_sizes[SIZE_160X120].height;
	uvd->vcap.maxwidth = camera_sizes[SIZE_320X240].width;
	uvd->vcap.maxheight = camera_sizes[SIZE_320X240].height;

	memset(&uvd->vchan, 0, sizeof(uvd->vchan));
	uvd->vchan.flags = 0 ;
	uvd->vchan.tuners = 0;
	uvd->vchan.channel = 0;
	uvd->vchan.type = VIDEO_TYPE_CAMERA;
	strcpy(uvd->vchan.name, "Camera");

	CHECK_RET(ret, qcm_sensor_init(uvd));
	return 0;
}

static int qcm_probe(struct usb_interface *intf,
			const struct usb_device_id *devid)
{
	int err;
	struct uvd *uvd;
	struct usb_device *dev = interface_to_usbdev(intf);
	struct qcm *cam;
	size_t buffer_size;
	unsigned char video_ep;
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	int i,j;
	unsigned int ifacenum, ifacenum_inact=0;
	__le16 sensor_id;

	/* we don't support multiconfig cams */
	if (dev->descriptor.bNumConfigurations != 1)
		return -ENODEV;

	/* first check for the video interface and not
	* the audio interface */
	interface = &intf->cur_altsetting[0];
	if ((interface->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
		|| (interface->desc.bInterfaceSubClass !=
			USB_CLASS_VENDOR_SPEC))
		return -ENODEV;

	/*
	walk through each endpoint in each setting in the interface
	stop when we find the one that's an isochronous IN endpoint.
	*/
	for (i=0; i < intf->num_altsetting; i++) {
		interface = &intf->cur_altsetting[i];
		ifacenum = interface->desc.bAlternateSetting;
		/* walk the end points */
		for (j=0; j < interface->desc.bNumEndpoints; j++) {
			endpoint = &interface->endpoint[j].desc;

			if ((endpoint->bEndpointAddress &
				USB_ENDPOINT_DIR_MASK) != USB_DIR_IN)
				continue; /* not input then not good */

			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
			if (!buffer_size) {
				ifacenum_inact = ifacenum;
				continue; /* 0 pkt size is not what we want */
			}

			if ((endpoint->bmAttributes &
				USB_ENDPOINT_XFERTYPE_MASK) ==
				USB_ENDPOINT_XFER_ISOC) {
				video_ep = endpoint->bEndpointAddress;
				/* break out of the search */
				goto good_videoep;
			}
		}
	}
	/* failed out since nothing useful was found */
	err("No suitable endpoint was found\n");
	return -ENODEV;

good_videoep:
	/* disable isochronous stream before doing anything else */
	err = qcm_stv_setb(dev, STV_ISO_ENABLE, 0);
	if (err < 0) {
		err("Failed to disable sensor stream");
		return -EIO;
	}

	/*
	Check that this is the same unknown sensor that is known to work. This
	sensor is suspected to be the ST VV6422C001. I'll check the same value
	that the qc-usb driver checks. This value is probably not even the
	sensor ID since it matches the USB dev ID. Oh well. If it doesn't
	match, it's probably a diff sensor so exit and apologize.
	*/
	err = qcm_stv_getw(dev, CMOS_SENSOR_IDREV, &sensor_id);
	if (err < 0) {
		err("Couldn't read sensor values. Err %d\n",err);
		return err;
	}
	if (sensor_id != cpu_to_le16(0x08F0)) {
		err("Sensor ID %x != %x. Unsupported. Sorry\n",
			le16_to_cpu(sensor_id), (0x08F0));
		return -ENODEV;
	}

	uvd = usbvideo_AllocateDevice(cams);
	if (!uvd)
		return -ENOMEM;

	cam = (struct qcm *) uvd->user_data;

	/* buf for doing demosaicing */
	cam->scratch = kmalloc(324*2, GFP_KERNEL);
	if (!cam->scratch) /* uvd freed in dereg */
		return -ENOMEM;

	/* yes, if we fail after here, cam->scratch gets freed
	by qcm_free_uvd */

	err = qcm_alloc_int_urb(cam);
	if (err < 0)
		return err;

	/* yes, if we fail after here, int urb gets freed
	by qcm_free_uvd */

	RESTRICT_TO_RANGE(size, SIZE_160X120, SIZE_320X240);
	cam->width = camera_sizes[size].width;
	cam->height = camera_sizes[size].height;
	cam->size = size;

	uvd->debug = debug;
	uvd->flags = 0;
	uvd->dev = dev;
	uvd->iface = intf->altsetting->desc.bInterfaceNumber;
	uvd->ifaceAltActive = ifacenum;
	uvd->ifaceAltInactive = ifacenum_inact;
	uvd->video_endp = video_ep;
	uvd->iso_packet_len = buffer_size;
	uvd->paletteBits = 1L << VIDEO_PALETTE_RGB24;
	uvd->defaultPalette = VIDEO_PALETTE_RGB24;
	uvd->canvas = VIDEOSIZE(320, 240);
	uvd->videosize = VIDEOSIZE(cam->width, cam->height);
	err = qcm_configure_video(uvd);
	if (err) {
		err("failed to configure video settings");
		return err;
	}

	err = usbvideo_RegisterVideoDevice(uvd);
	if (err) { /* the uvd gets freed in Deregister */
		err("usbvideo_RegisterVideoDevice() failed.");
		return err;
	}

	uvd->max_frame_size = (320 * 240 * 3);
	qcm_register_input(cam, dev);
	usb_set_intfdata(intf, uvd);
	return 0;
}

static void qcm_free_uvd(struct uvd *uvd)
{
	struct qcm *cam = (struct qcm *) uvd->user_data;

	kfree(cam->scratch);
	qcm_unregister_input(cam);
	qcm_free_int(cam);
}

static struct usbvideo_cb qcm_driver = {
	.probe = 		qcm_probe,
	.setupOnOpen = 		qcm_setup_on_open,
	.processData = 		qcm_process_isoc,
	.setVideoMode = 	qcm_set_video_mode,
	.startDataPump = 	qcm_start_data,
	.stopDataPump = 	qcm_stop_data,
	.adjustPicture = 	qcm_adjust_picture,
	.userFree = 		qcm_free_uvd
};

static int __init qcm_init(void)
{
	info(DRIVER_DESC " " DRIVER_VERSION);

	return usbvideo_register(
		&cams,
		MAX_CAMERAS,
		sizeof(struct qcm),
		"QCM",
		&qcm_driver,
		THIS_MODULE,
		qcm_table);
}

static void __exit qcm_exit(void)
{
	usbvideo_Deregister(&cams);
}

module_param(size, int, 0);
MODULE_PARM_DESC(size, "Initial Size 0: 160x120 1: 320x240");
module_param(colour, int, 0);
MODULE_PARM_DESC(colour, "Initial colour");
module_param(hue, int, 0);
MODULE_PARM_DESC(hue, "Initial hue");
module_param(brightness, int, 0);
MODULE_PARM_DESC(brightness, "Initial brightness");
module_param(contrast, int, 0);
MODULE_PARM_DESC(contrast, "Initial contrast");
module_param(whiteness, int, 0);
MODULE_PARM_DESC(whiteness, "Initial whiteness");

#ifdef CONFIG_USB_DEBUG
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level: 0-9 (default=0)");
#endif

module_init(qcm_init);
module_exit(qcm_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jaya Kumar");
MODULE_DESCRIPTION("QCM USB Camera");
MODULE_SUPPORTED_DEVICE("QCM USB Camera");