Free Electrons

Embedded Linux Experts

   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", __func__ , ## arg); \
	}
#else
#define DEBUG(n, arg...)
static const int debug;
#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) {
		dev_warn(&dev->dev, "insufficient mem for cam input device\n");
		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(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);

	error = input_register_device(cam->input);
	if (error) {
		dev_warn(&dev->dev,
			 "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, KEY_CAMERA, 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, __le16 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, 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) {
			dev_warn(&uvd->dev->dev,
				 "Data error: packet=%d. len=%d. status=%d.\n",
				 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)
		dev_warn(&uvd->dev->dev, "couldn't turn the cam off.\n");

	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 (usb_endpoint_dir_out(endpoint))
				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 (usb_endpoint_xfer_isoc(endpoint)) {
				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)
{
	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");

	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");