aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/stk-webcam.c
blob: 1a6d39cbd6f31b79ad91071f1d9a2802a91042a3 (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
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
/*
 * stk-webcam.c : Driver for Syntek 1125 USB webcam controller
 *
 * Copyright (C) 2006 Nicolas VIVIEN
 * Copyright 2007-2008 Jaime Velasco Juan <jsagarribay@gmail.com>
 *
 * Some parts are inspired from cafe_ccic.c
 * Copyright 2006-2007 Jonathan Corbet
 *
 * 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
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include <linux/usb.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>

#include "stk-webcam.h"


static int hflip = 1;
module_param(hflip, bool, 0444);
MODULE_PARM_DESC(hflip, "Horizontal image flip (mirror). Defaults to 1");

static int vflip = 1;
module_param(vflip, bool, 0444);
MODULE_PARM_DESC(vflip, "Vertical image flip. Defaults to 1");

static int debug;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Debug v4l ioctls. Defaults to 0");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jaime Velasco Juan <jsagarribay@gmail.com> and Nicolas VIVIEN");
MODULE_DESCRIPTION("Syntek DC1125 webcam driver");



/* Some cameras have audio interfaces, we aren't interested in those */
static struct usb_device_id stkwebcam_table[] = {
	{ USB_DEVICE_AND_INTERFACE_INFO(0x174f, 0xa311, 0xff, 0xff, 0xff) },
	{ USB_DEVICE_AND_INTERFACE_INFO(0x05e1, 0x0501, 0xff, 0xff, 0xff) },
	{ }
};
MODULE_DEVICE_TABLE(usb, stkwebcam_table);

/*
 * Basic stuff
 */
int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
{
	struct usb_device *udev = dev->udev;
	int ret;

	ret =  usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
			0x01,
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			value,
			index,
			NULL,
			0,
			500);
	if (ret < 0)
		return ret;
	else
		return 0;
}

int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
{
	struct usb_device *udev = dev->udev;
	int ret;

	ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
			0x00,
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			0x00,
			index,
			(u8 *) value,
			sizeof(u8),
			500);
	if (ret < 0)
		return ret;
	else
		return 0;
}

static int stk_start_stream(struct stk_camera *dev)
{
	int value;
	int i, ret;
	int value_116, value_117;

	if (!is_present(dev))
		return -ENODEV;
	if (!is_memallocd(dev) || !is_initialised(dev)) {
		STK_ERROR("FIXME: Buffers are not allocated\n");
		return -EFAULT;
	}
	ret = usb_set_interface(dev->udev, 0, 5);

	if (ret < 0)
		STK_ERROR("usb_set_interface failed !\n");
	if (stk_sensor_wakeup(dev))
		STK_ERROR("error awaking the sensor\n");

	stk_camera_read_reg(dev, 0x0116, &value_116);
	stk_camera_read_reg(dev, 0x0117, &value_117);

	stk_camera_write_reg(dev, 0x0116, 0x0000);
	stk_camera_write_reg(dev, 0x0117, 0x0000);

	stk_camera_read_reg(dev, 0x0100, &value);
	stk_camera_write_reg(dev, 0x0100, value | 0x80);

	stk_camera_write_reg(dev, 0x0116, value_116);
	stk_camera_write_reg(dev, 0x0117, value_117);
	for (i = 0; i < MAX_ISO_BUFS; i++) {
		if (dev->isobufs[i].urb) {
			ret = usb_submit_urb(dev->isobufs[i].urb, GFP_KERNEL);
			atomic_inc(&dev->urbs_used);
			if (ret)
				return ret;
		}
	}
	set_streaming(dev);
	return 0;
}

static int stk_stop_stream(struct stk_camera *dev)
{
	int value;
	int i;
	if (is_present(dev)) {
		stk_camera_read_reg(dev, 0x0100, &value);
		stk_camera_write_reg(dev, 0x0100, value & ~0x80);
		if (dev->isobufs != NULL) {
			for (i = 0; i < MAX_ISO_BUFS; i++) {
				if (dev->isobufs[i].urb)
					usb_kill_urb(dev->isobufs[i].urb);
			}
		}
		unset_streaming(dev);

		if (usb_set_interface(dev->udev, 0, 0))
			STK_ERROR("usb_set_interface failed !\n");
		if (stk_sensor_sleep(dev))
			STK_ERROR("error suspending the sensor\n");
	}
	return 0;
}

/*
 * This seems to be the shortest init sequence we
 * must do in order to find the sensor
 * Bit 5 of reg. 0x0000 here is important, when reset to 0 the sensor
 * is also reset. Maybe powers down it?
 * Rest of values don't make a difference
 */

static struct regval stk1125_initvals[] = {
	/*TODO: What means this sequence? */
	{0x0000, 0x24},
	{0x0100, 0x21},
	{0x0002, 0x68},
	{0x0003, 0x80},
	{0x0005, 0x00},
	{0x0007, 0x03},
	{0x000d, 0x00},
	{0x000f, 0x02},
	{0x0300, 0x12},
	{0x0350, 0x41},
	{0x0351, 0x00},
	{0x0352, 0x00},
	{0x0353, 0x00},
	{0x0018, 0x10},
	{0x0019, 0x00},
	{0x001b, 0x0e},
	{0x001c, 0x46},
	{0x0300, 0x80},
	{0x001a, 0x04},
	{0x0110, 0x00},
	{0x0111, 0x00},
	{0x0112, 0x00},
	{0x0113, 0x00},

	{0xffff, 0xff},
};


static int stk_initialise(struct stk_camera *dev)
{
	struct regval *rv;
	int ret;
	if (!is_present(dev))
		return -ENODEV;
	if (is_initialised(dev))
		return 0;
	rv = stk1125_initvals;
	while (rv->reg != 0xffff) {
		ret = stk_camera_write_reg(dev, rv->reg, rv->val);
		if (ret)
			return ret;
		rv++;
	}
	if (stk_sensor_init(dev) == 0) {
		set_initialised(dev);
		return 0;
	} else
		return -1;
}

#ifdef CONFIG_VIDEO_V4L1_COMPAT

/* sysfs functions */
/*FIXME cleanup this */

static ssize_t show_brightness(struct device *class,
			struct device_attribute *attr, char *buf)
{
	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	return sprintf(buf, "%X\n", dev->vsettings.brightness);
}

static ssize_t store_brightness(struct device *class,
		struct device_attribute *attr, const char *buf, size_t count)
{
	char *endp;
	unsigned long value;
	int ret;

	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	value = simple_strtoul(buf, &endp, 16);

	dev->vsettings.brightness = (int) value;

	ret = stk_sensor_set_brightness(dev, value >> 8);
	if (ret)
		return ret;
	else
		return count;
}

static ssize_t show_hflip(struct device *class,
		struct device_attribute *attr, char *buf)
{
	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	return sprintf(buf, "%d\n", dev->vsettings.hflip);
}

static ssize_t store_hflip(struct device *class,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	if (strncmp(buf, "1", 1) == 0)
		dev->vsettings.hflip = 1;
	else if (strncmp(buf, "0", 1) == 0)
		dev->vsettings.hflip = 0;
	else
		return -EINVAL;

	return strlen(buf);
}

static ssize_t show_vflip(struct device *class,
		struct device_attribute *attr, char *buf)
{
	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	return sprintf(buf, "%d\n", dev->vsettings.vflip);
}

static ssize_t store_vflip(struct device *class,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct video_device *vdev = to_video_device(class);
	struct stk_camera *dev = vdev_to_camera(vdev);

	if (strncmp(buf, "1", 1) == 0)
		dev->vsettings.vflip = 1;
	else if (strncmp(buf, "0", 1) == 0)
		dev->vsettings.vflip = 0;
	else
		return -EINVAL;

	return strlen(buf);
}

static DEVICE_ATTR(brightness, S_IRUGO | S_IWUGO,
			show_brightness, store_brightness);
static DEVICE_ATTR(hflip, S_IRUGO | S_IWUGO, show_hflip, store_hflip);
static DEVICE_ATTR(vflip, S_IRUGO | S_IWUGO, show_vflip, store_vflip);

static int stk_create_sysfs_files(struct video_device *vdev)
{
	int ret;

	ret = device_create_file(&vdev->dev, &dev_attr_brightness);
	ret += device_create_file(&vdev->dev, &dev_attr_hflip);
	ret += device_create_file(&vdev->dev, &dev_attr_vflip);
	if (ret)
		STK_WARNING("Could not create sysfs files\n");
	return ret;
}

static void stk_remove_sysfs_files(struct video_device *vdev)
{
	device_remove_file(&vdev->dev, &dev_attr_brightness);
	device_remove_file(&vdev->dev, &dev_attr_hflip);
	device_remove_file(&vdev->dev, &dev_attr_vflip);
}

#else
#define stk_create_sysfs_files(a)
#define stk_remove_sysfs_files(a)
#endif

/* *********************************************** */
/*
 * This function is called as an URB transfert is complete (Isochronous pipe).
 * So, the traitement is done in interrupt time, so it has be fast, not crash,
 * and not stall. Neat.
 */
static void stk_isoc_handler(struct urb *urb)
{
	int i;
	int ret;
	int framelen;
	unsigned long flags;

	unsigned char *fill = NULL;
	unsigned char *iso_buf = NULL;

	struct stk_camera *dev;
	struct stk_sio_buffer *fb;

	dev = (struct stk_camera *) urb->context;

	if (dev == NULL) {
		STK_ERROR("isoc_handler called with NULL device !\n");
		return;
	}

	if (urb->status == -ENOENT || urb->status == -ECONNRESET
		|| urb->status == -ESHUTDOWN) {
		atomic_dec(&dev->urbs_used);
		return;
	}

	spin_lock_irqsave(&dev->spinlock, flags);

	if (urb->status != -EINPROGRESS && urb->status != 0) {
		STK_ERROR("isoc_handler: urb->status == %d\n", urb->status);
		goto resubmit;
	}

	if (list_empty(&dev->sio_avail)) {
		/*FIXME Stop streaming after a while */
		(void) (printk_ratelimit() &&
		STK_ERROR("isoc_handler without available buffer!\n"));
		goto resubmit;
	}
	fb = list_first_entry(&dev->sio_avail,
			struct stk_sio_buffer, list);
	fill = fb->buffer + fb->v4lbuf.bytesused;

	for (i = 0; i < urb->number_of_packets; i++) {
		if (urb->iso_frame_desc[i].status != 0) {
			if (urb->iso_frame_desc[i].status != -EXDEV)
				STK_ERROR("Frame %d has error %d\n", i,
					urb->iso_frame_desc[i].status);
			continue;
		}
		framelen = urb->iso_frame_desc[i].actual_length;
		iso_buf = urb->transfer_buffer + urb->iso_frame_desc[i].offset;

		if (framelen <= 4)
			continue; /* no data */

		/*
		 * we found something informational from there
		 * the isoc frames have to type of headers
		 * type1: 00 xx 00 00 or 20 xx 00 00
		 * type2: 80 xx 00 00 00 00 00 00 or a0 xx 00 00 00 00 00 00
		 * xx is a sequencer which has never been seen over 0x3f
		 * imho data written down looks like bayer, i see similarities
		 * after every 640 bytes
		 */
		if (*iso_buf & 0x80) {
			framelen -= 8;
			iso_buf += 8;
			/* This marks a new frame */
			if (fb->v4lbuf.bytesused != 0
				&& fb->v4lbuf.bytesused != dev->frame_size) {
				(void) (printk_ratelimit() &&
				STK_ERROR("frame %d, "
					"bytesused=%d, skipping\n",
					i, fb->v4lbuf.bytesused));
				fb->v4lbuf.bytesused = 0;
				fill = fb->buffer;
			} else if (fb->v4lbuf.bytesused == dev->frame_size) {
				if (list_is_singular(&dev->sio_avail)) {
					/* Always reuse the last buffer */
					fb->v4lbuf.bytesused = 0;
					fill = fb->buffer;
				} else {
					list_move_tail(dev->sio_avail.next,
						&dev->sio_full);
					wake_up(&dev->wait_frame);
					fb = list_first_entry(&dev->sio_avail,
						struct stk_sio_buffer, list);
					fb->v4lbuf.bytesused = 0;
					fill = fb->buffer;
				}
			}
		} else {
			framelen -= 4;
			iso_buf += 4;
		}

		/* Our buffer is full !!! */
		if (framelen + fb->v4lbuf.bytesused > dev->frame_size) {
			(void) (printk_ratelimit() &&
			STK_ERROR("Frame buffer overflow, lost sync\n"));
			/*FIXME Do something here? */
			continue;
		}
		spin_unlock_irqrestore(&dev->spinlock, flags);
		memcpy(fill, iso_buf, framelen);
		spin_lock_irqsave(&dev->spinlock, flags);
		fill += framelen;

		/* New size of our buffer */
		fb->v4lbuf.bytesused += framelen;
	}

resubmit:
	spin_unlock_irqrestore(&dev->spinlock, flags);
	urb->dev = dev->udev;
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret != 0) {
		STK_ERROR("Error (%d) re-submitting urb in stk_isoc_handler.\n",
			ret);
	}
}

/* -------------------------------------------- */

static int stk_prepare_iso(struct stk_camera *dev)
{
	void *kbuf;
	int i, j;
	struct urb *urb;
	struct usb_device *udev;

	if (dev == NULL)
		return -ENXIO;
	udev = dev->udev;

	if (dev->isobufs)
		STK_ERROR("isobufs already allocated. Bad\n");
	else
		dev->isobufs = kzalloc(MAX_ISO_BUFS * sizeof(*dev->isobufs),
					GFP_KERNEL);
	if (dev->isobufs == NULL) {
		STK_ERROR("Unable to allocate iso buffers\n");
		return -ENOMEM;
	}
	for (i = 0; i < MAX_ISO_BUFS; i++) {
		if (dev->isobufs[i].data == NULL) {
			kbuf = kzalloc(ISO_BUFFER_SIZE, GFP_KERNEL);
			if (kbuf == NULL) {
				STK_ERROR("Failed to allocate iso buffer %d\n",
					i);
				goto isobufs_out;
			}
			dev->isobufs[i].data = kbuf;
		} else
			STK_ERROR("isobuf data already allocated\n");
		if (dev->isobufs[i].urb == NULL) {
			urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
			if (urb == NULL) {
				STK_ERROR("Failed to allocate URB %d\n", i);
				goto isobufs_out;
			}
			dev->isobufs[i].urb = urb;
		} else {
			STK_ERROR("Killing URB\n");
			usb_kill_urb(dev->isobufs[i].urb);
			urb = dev->isobufs[i].urb;
		}
		urb->interval = 1;
		urb->dev = udev;
		urb->pipe = usb_rcvisocpipe(udev, dev->isoc_ep);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = dev->isobufs[i].data;
		urb->transfer_buffer_length = ISO_BUFFER_SIZE;
		urb->complete = stk_isoc_handler;
		urb->context = dev;
		urb->start_frame = 0;
		urb->number_of_packets = ISO_FRAMES_PER_DESC;

		for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
			urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
			urb->iso_frame_desc[j].length = ISO_MAX_FRAME_SIZE;
		}
	}
	set_memallocd(dev);
	return 0;

isobufs_out:
	for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].data; i++)
		kfree(dev->isobufs[i].data);
	for (i = 0; i < MAX_ISO_BUFS && dev->isobufs[i].urb; i++)
		usb_free_urb(dev->isobufs[i].urb);
	kfree(dev->isobufs);
	dev->isobufs = NULL;
	return -ENOMEM;
}

static void stk_clean_iso(struct stk_camera *dev)
{
	int i;

	if (dev == NULL || dev->isobufs == NULL)
		return;

	for (i = 0; i < MAX_ISO_BUFS; i++) {
		struct urb *urb;

		urb = dev->isobufs[i].urb;
		if (urb) {
			if (atomic_read(&dev->urbs_used) && is_present(dev))
				usb_kill_urb(urb);
			usb_free_urb(urb);
		}
		kfree(dev->isobufs[i].data);
	}
	kfree(dev->isobufs);
	dev->isobufs = NULL;
	unset_memallocd(dev);
}

static int stk_setup_siobuf(struct stk_camera *dev, int index)
{
	struct stk_sio_buffer *buf = dev->sio_bufs + index;
	INIT_LIST_HEAD(&buf->list);
	buf->v4lbuf.length = PAGE_ALIGN(dev->frame_size);
	buf->buffer = vmalloc_user(buf->v4lbuf.length);
	if (buf->buffer == NULL)
		return -ENOMEM;
	buf->mapcount = 0;
	buf->dev = dev;
	buf->v4lbuf.index = index;
	buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	buf->v4lbuf.field = V4L2_FIELD_NONE;
	buf->v4lbuf.memory = V4L2_MEMORY_MMAP;
	buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length;
	return 0;
}

static int stk_free_sio_buffers(struct stk_camera *dev)
{
	int i;
	int nbufs;
	unsigned long flags;
	if (dev->n_sbufs == 0 || dev->sio_bufs == NULL)
		return 0;
	/*
	* If any buffers are mapped, we cannot free them at all.
	*/
	for (i = 0; i < dev->n_sbufs; i++) {
		if (dev->sio_bufs[i].mapcount > 0)
			return -EBUSY;
	}
	/*
	* OK, let's do it.
	*/
	spin_lock_irqsave(&dev->spinlock, flags);
	INIT_LIST_HEAD(&dev->sio_avail);
	INIT_LIST_HEAD(&dev->sio_full);
	nbufs = dev->n_sbufs;
	dev->n_sbufs = 0;
	spin_unlock_irqrestore(&dev->spinlock, flags);
	for (i = 0; i < nbufs; i++) {
		if (dev->sio_bufs[i].buffer != NULL)
			vfree(dev->sio_bufs[i].buffer);
	}
	kfree(dev->sio_bufs);
	dev->sio_bufs = NULL;
	return 0;
}

static int stk_prepare_sio_buffers(struct stk_camera *dev, unsigned n_sbufs)
{
	int i;
	if (dev->sio_bufs != NULL)
		STK_ERROR("sio_bufs already allocated\n");
	else {
		dev->sio_bufs = kzalloc(n_sbufs * sizeof(struct stk_sio_buffer),
				GFP_KERNEL);
		if (dev->sio_bufs == NULL)
			return -ENOMEM;
		for (i = 0; i < n_sbufs; i++) {
			if (stk_setup_siobuf(dev, i))
				return (dev->n_sbufs > 1)? 0 : -ENOMEM;
			dev->n_sbufs = i+1;
		}
	}
	return 0;
}

static int stk_allocate_buffers(struct stk_camera *dev, unsigned n_sbufs)
{
	int err;
	err = stk_prepare_iso(dev);
	if (err) {
		stk_clean_iso(dev);
		return err;
	}
	err = stk_prepare_sio_buffers(dev, n_sbufs);
	if (err) {
		stk_free_sio_buffers(dev);
		return err;
	}
	return 0;
}

static void stk_free_buffers(struct stk_camera *dev)
{
	stk_clean_iso(dev);
	stk_free_sio_buffers(dev);
}
/* -------------------------------------------- */

/* v4l file operations */

static int v4l_stk_open(struct file *fp)
{
	struct stk_camera *dev;
	struct video_device *vdev;

	vdev = video_devdata(fp);
	dev = vdev_to_camera(vdev);

	lock_kernel();
	if (dev == NULL || !is_present(dev)) {
		unlock_kernel();
		return -ENXIO;
	}
	fp->private_data = dev;
	usb_autopm_get_interface(dev->interface);
	unlock_kernel();

	return 0;
}

static int v4l_stk_release(struct file *fp)
{
	struct stk_camera *dev = fp->private_data;

	if (dev->owner == fp) {
		stk_stop_stream(dev);
		stk_free_buffers(dev);
		dev->owner = NULL;
	}

	if(is_present(dev))
		usb_autopm_put_interface(dev->interface);

	return 0;
}

static ssize_t v4l_stk_read(struct file *fp, char __user *buf,
		size_t count, loff_t *f_pos)
{
	int i;
	int ret;
	unsigned long flags;
	struct stk_sio_buffer *sbuf;
	struct stk_camera *dev = fp->private_data;

	if (!is_present(dev))
		return -EIO;
	if (dev->owner && dev->owner != fp)
		return -EBUSY;
	dev->owner = fp;
	if (!is_streaming(dev)) {
		if (stk_initialise(dev)
			|| stk_allocate_buffers(dev, 3)
			|| stk_start_stream(dev))
			return -ENOMEM;
		spin_lock_irqsave(&dev->spinlock, flags);
		for (i = 0; i < dev->n_sbufs; i++) {
			list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
			dev->sio_bufs[i].v4lbuf.flags = V4L2_BUF_FLAG_QUEUED;
		}
		spin_unlock_irqrestore(&dev->spinlock, flags);
	}
	if (*f_pos == 0) {
		if (fp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
			return -EWOULDBLOCK;
		ret = wait_event_interruptible(dev->wait_frame,
			!list_empty(&dev->sio_full) || !is_present(dev));
		if (ret)
			return ret;
		if (!is_present(dev))
			return -EIO;
	}
	if (count + *f_pos > dev->frame_size)
		count = dev->frame_size - *f_pos;
	spin_lock_irqsave(&dev->spinlock, flags);
	if (list_empty(&dev->sio_full)) {
		spin_unlock_irqrestore(&dev->spinlock, flags);
		STK_ERROR("BUG: No siobufs ready\n");
		return 0;
	}
	sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
	spin_unlock_irqrestore(&dev->spinlock, flags);

	if (copy_to_user(buf, sbuf->buffer + *f_pos, count))
		return -EFAULT;

	*f_pos += count;

	if (*f_pos >= dev->frame_size) {
		*f_pos = 0;
		spin_lock_irqsave(&dev->spinlock, flags);
		list_move_tail(&sbuf->list, &dev->sio_avail);
		spin_unlock_irqrestore(&dev->spinlock, flags);
	}
	return count;
}

static unsigned int v4l_stk_poll(struct file *fp, poll_table *wait)
{
	struct stk_camera *dev = fp->private_data;

	poll_wait(fp, &dev->wait_frame, wait);

	if (!is_present(dev))
		return POLLERR;

	if (!list_empty(&dev->sio_full))
		return (POLLIN | POLLRDNORM);

	return 0;
}


static void stk_v4l_vm_open(struct vm_area_struct *vma)
{
	struct stk_sio_buffer *sbuf = vma->vm_private_data;
	sbuf->mapcount++;
}
static void stk_v4l_vm_close(struct vm_area_struct *vma)
{
	struct stk_sio_buffer *sbuf = vma->vm_private_data;
	sbuf->mapcount--;
	if (sbuf->mapcount == 0)
		sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED;
}
static struct vm_operations_struct stk_v4l_vm_ops = {
	.open = stk_v4l_vm_open,
	.close = stk_v4l_vm_close
};

static int v4l_stk_mmap(struct file *fp, struct vm_area_struct *vma)
{
	unsigned int i;
	int ret;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	struct stk_camera *dev = fp->private_data;
	struct stk_sio_buffer *sbuf = NULL;

	if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
		return -EINVAL;

	for (i = 0; i < dev->n_sbufs; i++) {
		if (dev->sio_bufs[i].v4lbuf.m.offset == offset) {
			sbuf = dev->sio_bufs + i;
			break;
		}
	}
	if (sbuf == NULL)
		return -EINVAL;
	ret = remap_vmalloc_range(vma, sbuf->buffer, 0);
	if (ret)
		return ret;
	vma->vm_flags |= VM_DONTEXPAND;
	vma->vm_private_data = sbuf;
	vma->vm_ops = &stk_v4l_vm_ops;
	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED;
	stk_v4l_vm_open(vma);
	return 0;
}

/* v4l ioctl handlers */

static int stk_vidioc_querycap(struct file *filp,
		void *priv, struct v4l2_capability *cap)
{
	strcpy(cap->driver, "stk");
	strcpy(cap->card, "stk");
	cap->version = DRIVER_VERSION_NUM;

	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
		| V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
	return 0;
}

static int stk_vidioc_enum_input(struct file *filp,
		void *priv, struct v4l2_input *input)
{
	if (input->index != 0)
		return -EINVAL;

	strcpy(input->name, "Syntek USB Camera");
	input->type = V4L2_INPUT_TYPE_CAMERA;
	return 0;
}


static int stk_vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

static int stk_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	if (i != 0)
		return -EINVAL;
	else
		return 0;
}

/* from vivi.c */
static int stk_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
{
	return 0;
}

/* List of all V4Lv2 controls supported by the driver */
static struct v4l2_queryctrl stk_controls[] = {
	{
		.id      = V4L2_CID_BRIGHTNESS,
		.type    = V4L2_CTRL_TYPE_INTEGER,
		.name    = "Brightness",
		.minimum = 0,
		.maximum = 0xffff,
		.step    = 0x0100,
		.default_value = 0x6000,
	},
	/*TODO: get more controls to work */
};

static int stk_vidioc_queryctrl(struct file *filp,
		void *priv, struct v4l2_queryctrl *c)
{
	int i;
	int nbr;
	nbr = ARRAY_SIZE(stk_controls);

	for (i = 0; i < nbr; i++) {
		if (stk_controls[i].id == c->id) {
			memcpy(c, &stk_controls[i],
				sizeof(struct v4l2_queryctrl));
			return 0;
		}
	}
	return -EINVAL;
}

static int stk_vidioc_g_ctrl(struct file *filp,
		void *priv, struct v4l2_control *c)
{
	struct stk_camera *dev = priv;
	switch (c->id) {
	case V4L2_CID_BRIGHTNESS:
		c->value = dev->vsettings.brightness;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int stk_vidioc_s_ctrl(struct file *filp,
		void *priv, struct v4l2_control *c)
{
	struct stk_camera *dev = priv;
	switch (c->id) {
	case V4L2_CID_BRIGHTNESS:
		dev->vsettings.brightness = c->value;
		return stk_sensor_set_brightness(dev, c->value >> 8);
	default:
		return -EINVAL;
	}
	return 0;
}


static int stk_vidioc_enum_fmt_vid_cap(struct file *filp,
		void *priv, struct v4l2_fmtdesc *fmtd)
{
	switch (fmtd->index) {
	case 0:
		fmtd->pixelformat = V4L2_PIX_FMT_RGB565;
		strcpy(fmtd->description, "r5g6b5");
		break;
	case 1:
		fmtd->pixelformat = V4L2_PIX_FMT_RGB565X;
		strcpy(fmtd->description, "r5g6b5BE");
		break;
	case 2:
		fmtd->pixelformat = V4L2_PIX_FMT_UYVY;
		strcpy(fmtd->description, "yuv4:2:2");
		break;
	case 3:
		fmtd->pixelformat = V4L2_PIX_FMT_SBGGR8;
		strcpy(fmtd->description, "Raw bayer");
		break;
	case 4:
		fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
		strcpy(fmtd->description, "yuv4:2:2");
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static struct stk_size {
	unsigned w;
	unsigned h;
	enum stk_mode m;
} stk_sizes[] = {
	{ .w = 1280, .h = 1024, .m = MODE_SXGA, },
	{ .w = 640,  .h = 480,  .m = MODE_VGA,  },
	{ .w = 352,  .h = 288,  .m = MODE_CIF,  },
	{ .w = 320,  .h = 240,  .m = MODE_QVGA, },
	{ .w = 176,  .h = 144,  .m = MODE_QCIF, },
};

static int stk_vidioc_g_fmt_vid_cap(struct file *filp,
		void *priv, struct v4l2_format *f)
{
	struct v4l2_pix_format *pix_format = &f->fmt.pix;
	struct stk_camera *dev = priv;
	int i;

	for (i = 0; i < ARRAY_SIZE(stk_sizes)
			&& stk_sizes[i].m != dev->vsettings.mode;
		i++);
	if (i == ARRAY_SIZE(stk_sizes)) {
		STK_ERROR("ERROR: mode invalid\n");
		return -EINVAL;
	}
	pix_format->width = stk_sizes[i].w;
	pix_format->height = stk_sizes[i].h;
	pix_format->field = V4L2_FIELD_NONE;
	pix_format->colorspace = V4L2_COLORSPACE_SRGB;
	pix_format->pixelformat = dev->vsettings.palette;
	if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
		pix_format->bytesperline = pix_format->width;
	else
		pix_format->bytesperline = 2 * pix_format->width;
	pix_format->sizeimage = pix_format->bytesperline
				* pix_format->height;
	return 0;
}

static int stk_vidioc_try_fmt_vid_cap(struct file *filp,
		void *priv, struct v4l2_format *fmtd)
{
	int i;
	switch (fmtd->fmt.pix.pixelformat) {
	case V4L2_PIX_FMT_RGB565:
	case V4L2_PIX_FMT_RGB565X:
	case V4L2_PIX_FMT_UYVY:
	case V4L2_PIX_FMT_YUYV:
	case V4L2_PIX_FMT_SBGGR8:
		break;
	default:
		return -EINVAL;
	}
	for (i = 1; i < ARRAY_SIZE(stk_sizes); i++) {
		if (fmtd->fmt.pix.width > stk_sizes[i].w)
			break;
	}
	if (i == ARRAY_SIZE(stk_sizes)
		|| (abs(fmtd->fmt.pix.width - stk_sizes[i-1].w)
			< abs(fmtd->fmt.pix.width - stk_sizes[i].w))) {
		fmtd->fmt.pix.height = stk_sizes[i-1].h;
		fmtd->fmt.pix.width = stk_sizes[i-1].w;
		fmtd->fmt.pix.priv = i - 1;
	} else {
		fmtd->fmt.pix.height = stk_sizes[i].h;
		fmtd->fmt.pix.width = stk_sizes[i].w;
		fmtd->fmt.pix.priv = i;
	}

	fmtd->fmt.pix.field = V4L2_FIELD_NONE;
	fmtd->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
	if (fmtd->fmt.pix.pixelformat == V4L2_PIX_FMT_SBGGR8)
		fmtd->fmt.pix.bytesperline = fmtd->fmt.pix.width;
	else
		fmtd->fmt.pix.bytesperline = 2 * fmtd->fmt.pix.width;
	fmtd->fmt.pix.sizeimage = fmtd->fmt.pix.bytesperline
		* fmtd->fmt.pix.height;
	return 0;
}

static int stk_setup_format(struct stk_camera *dev)
{
	int i = 0;
	int depth;
	if (dev->vsettings.palette == V4L2_PIX_FMT_SBGGR8)
		depth = 1;
	else
		depth = 2;
	while (stk_sizes[i].m != dev->vsettings.mode
			&& i < ARRAY_SIZE(stk_sizes))
		i++;
	if (i == ARRAY_SIZE(stk_sizes)) {
		STK_ERROR("Something is broken in %s\n", __func__);
		return -EFAULT;
	}
	/* This registers controls some timings, not sure of what. */
	stk_camera_write_reg(dev, 0x001b, 0x0e);
	if (dev->vsettings.mode == MODE_SXGA)
		stk_camera_write_reg(dev, 0x001c, 0x0e);
	else
		stk_camera_write_reg(dev, 0x001c, 0x46);
	/*
	 * Registers 0x0115 0x0114 are the size of each line (bytes),
	 * regs 0x0117 0x0116 are the heigth of the image.
	 */
	stk_camera_write_reg(dev, 0x0115,
		((stk_sizes[i].w * depth) >> 8) & 0xff);
	stk_camera_write_reg(dev, 0x0114,
		(stk_sizes[i].w * depth) & 0xff);
	stk_camera_write_reg(dev, 0x0117,
		(stk_sizes[i].h >> 8) & 0xff);
	stk_camera_write_reg(dev, 0x0116,
		stk_sizes[i].h & 0xff);
	return stk_sensor_configure(dev);
}

static int stk_vidioc_s_fmt_vid_cap(struct file *filp,
		void *priv, struct v4l2_format *fmtd)
{
	int ret;
	struct stk_camera *dev = priv;

	if (dev == NULL)
		return -ENODEV;
	if (!is_present(dev))
		return -ENODEV;
	if (is_streaming(dev))
		return -EBUSY;
	if (dev->owner && dev->owner != filp)
		return -EBUSY;
	ret = stk_vidioc_try_fmt_vid_cap(filp, priv, fmtd);
	if (ret)
		return ret;
	dev->owner = filp;

	dev->vsettings.palette = fmtd->fmt.pix.pixelformat;
	stk_free_buffers(dev);
	dev->frame_size = fmtd->fmt.pix.sizeimage;
	dev->vsettings.mode = stk_sizes[fmtd->fmt.pix.priv].m;

	stk_initialise(dev);
	return stk_setup_format(dev);
}

static int stk_vidioc_reqbufs(struct file *filp,
		void *priv, struct v4l2_requestbuffers *rb)
{
	struct stk_camera *dev = priv;

	if (dev == NULL)
		return -ENODEV;
	if (rb->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;
	if (is_streaming(dev)
		|| (dev->owner && dev->owner != filp))
		return -EBUSY;
	dev->owner = filp;

	/*FIXME If they ask for zero, we must stop streaming and free */
	if (rb->count < 3)
		rb->count = 3;
	/* Arbitrary limit */
	else if (rb->count > 5)
		rb->count = 5;

	stk_allocate_buffers(dev, rb->count);
	rb->count = dev->n_sbufs;
	return 0;
}

static int stk_vidioc_querybuf(struct file *filp,
		void *priv, struct v4l2_buffer *buf)
{
	struct stk_camera *dev = priv;
	struct stk_sio_buffer *sbuf;

	if (buf->index < 0 || buf->index >= dev->n_sbufs)
		return -EINVAL;
	sbuf = dev->sio_bufs + buf->index;
	*buf = sbuf->v4lbuf;
	return 0;
}

static int stk_vidioc_qbuf(struct file *filp,
		void *priv, struct v4l2_buffer *buf)
{
	struct stk_camera *dev = priv;
	struct stk_sio_buffer *sbuf;
	unsigned long flags;

	if (buf->memory != V4L2_MEMORY_MMAP)
		return -EINVAL;

	if (buf->index < 0 || buf->index >= dev->n_sbufs)
		return -EINVAL;
	sbuf = dev->sio_bufs + buf->index;
	if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED)
		return 0;
	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED;
	sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE;
	spin_lock_irqsave(&dev->spinlock, flags);
	list_add_tail(&sbuf->list, &dev->sio_avail);
	*buf = sbuf->v4lbuf;
	spin_unlock_irqrestore(&dev->spinlock, flags);
	return 0;
}

static int stk_vidioc_dqbuf(struct file *filp,
		void *priv, struct v4l2_buffer *buf)
{
	struct stk_camera *dev = priv;
	struct stk_sio_buffer *sbuf;
	unsigned long flags;
	int ret;

	if (!is_streaming(dev))
		return -EINVAL;

	if (filp->f_flags & O_NONBLOCK && list_empty(&dev->sio_full))
		return -EWOULDBLOCK;
	ret = wait_event_interruptible(dev->wait_frame,
		!list_empty(&dev->sio_full) || !is_present(dev));
	if (ret)
		return ret;
	if (!is_present(dev))
		return -EIO;

	spin_lock_irqsave(&dev->spinlock, flags);
	sbuf = list_first_entry(&dev->sio_full, struct stk_sio_buffer, list);
	list_del_init(&sbuf->list);
	spin_unlock_irqrestore(&dev->spinlock, flags);
	sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED;
	sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE;
	sbuf->v4lbuf.sequence = ++dev->sequence;
	do_gettimeofday(&sbuf->v4lbuf.timestamp);

	*buf = sbuf->v4lbuf;
	return 0;
}

static int stk_vidioc_streamon(struct file *filp,
		void *priv, enum v4l2_buf_type type)
{
	struct stk_camera *dev = priv;
	if (is_streaming(dev))
		return 0;
	if (dev->sio_bufs == NULL)
		return -EINVAL;
	dev->sequence = 0;
	return stk_start_stream(dev);
}

static int stk_vidioc_streamoff(struct file *filp,
		void *priv, enum v4l2_buf_type type)
{
	struct stk_camera *dev = priv;
	unsigned long flags;
	int i;
	stk_stop_stream(dev);
	spin_lock_irqsave(&dev->spinlock, flags);
	INIT_LIST_HEAD(&dev->sio_avail);
	INIT_LIST_HEAD(&dev->sio_full);
	for (i = 0; i < dev->n_sbufs; i++) {
		INIT_LIST_HEAD(&dev->sio_bufs[i].list);
		dev->sio_bufs[i].v4lbuf.flags = 0;
	}
	spin_unlock_irqrestore(&dev->spinlock, flags);
	return 0;
}


static int stk_vidioc_g_parm(struct file *filp,
		void *priv, struct v4l2_streamparm *sp)
{
	/*FIXME This is not correct */
	sp->parm.capture.timeperframe.numerator = 1;
	sp->parm.capture.timeperframe.denominator = 30;
	sp->parm.capture.readbuffers = 2;
	return 0;
}

static int stk_vidioc_enum_framesizes(struct file *filp,
		void *priv, struct v4l2_frmsizeenum *frms)
{
	if (frms->index >= ARRAY_SIZE(stk_sizes))
		return -EINVAL;
	switch (frms->pixel_format) {
	case V4L2_PIX_FMT_RGB565:
	case V4L2_PIX_FMT_RGB565X:
	case V4L2_PIX_FMT_UYVY:
	case V4L2_PIX_FMT_YUYV:
	case V4L2_PIX_FMT_SBGGR8:
		frms->type = V4L2_FRMSIZE_TYPE_DISCRETE;
		frms->discrete.width = stk_sizes[frms->index].w;
		frms->discrete.height = stk_sizes[frms->index].h;
		return 0;
	default: return -EINVAL;
	}
}

static struct v4l2_file_operations v4l_stk_fops = {
	.owner = THIS_MODULE,
	.open = v4l_stk_open,
	.release = v4l_stk_release,
	.read = v4l_stk_read,
	.poll = v4l_stk_poll,
	.mmap = v4l_stk_mmap,
	.ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops v4l_stk_ioctl_ops = {
	.vidioc_querycap = stk_vidioc_querycap,
	.vidioc_enum_fmt_vid_cap = stk_vidioc_enum_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap = stk_vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap = stk_vidioc_s_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap = stk_vidioc_g_fmt_vid_cap,
	.vidioc_enum_input = stk_vidioc_enum_input,
	.vidioc_s_input = stk_vidioc_s_input,
	.vidioc_g_input = stk_vidioc_g_input,
	.vidioc_s_std = stk_vidioc_s_std,
	.vidioc_reqbufs = stk_vidioc_reqbufs,
	.vidioc_querybuf = stk_vidioc_querybuf,
	.vidioc_qbuf = stk_vidioc_qbuf,
	.vidioc_dqbuf = stk_vidioc_dqbuf,
	.vidioc_streamon = stk_vidioc_streamon,
	.vidioc_streamoff = stk_vidioc_streamoff,
	.vidioc_queryctrl = stk_vidioc_queryctrl,
	.vidioc_g_ctrl = stk_vidioc_g_ctrl,
	.vidioc_s_ctrl = stk_vidioc_s_ctrl,
	.vidioc_g_parm = stk_vidioc_g_parm,
	.vidioc_enum_framesizes = stk_vidioc_enum_framesizes,
};

static void stk_v4l_dev_release(struct video_device *vd)
{
	struct stk_camera *dev = vdev_to_camera(vd);

	if (dev->sio_bufs != NULL || dev->isobufs != NULL)
		STK_ERROR("We are leaking memory\n");
	usb_put_intf(dev->interface);
	kfree(dev);
}

static struct video_device stk_v4l_data = {
	.name = "stkwebcam",
	.minor = -1,
	.tvnorms = V4L2_STD_UNKNOWN,
	.current_norm = V4L2_STD_UNKNOWN,
	.fops = &v4l_stk_fops,
	.ioctl_ops = &v4l_stk_ioctl_ops,
	.release = stk_v4l_dev_release,
};


static int stk_register_video_device(struct stk_camera *dev)
{
	int err;

	dev->vdev = stk_v4l_data;
	dev->vdev.debug = debug;
	dev->vdev.parent = &dev->interface->dev;
	err = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
	if (err)
		STK_ERROR("v4l registration failed\n");
	else
		STK_INFO("Syntek USB2.0 Camera is now controlling video device"
			" /dev/video%d\n", dev->vdev.num);
	return err;
}


/* USB Stuff */

static int stk_camera_probe(struct usb_interface *interface,
		const struct usb_device_id *id)
{
	int i;
	int err = 0;

	struct stk_camera *dev = NULL;
	struct usb_device *udev = interface_to_usbdev(interface);
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;

	dev = kzalloc(sizeof(struct stk_camera), GFP_KERNEL);
	if (dev == NULL) {
		STK_ERROR("Out of memory !\n");
		return -ENOMEM;
	}

	spin_lock_init(&dev->spinlock);
	init_waitqueue_head(&dev->wait_frame);

	dev->udev = udev;
	dev->interface = interface;
	usb_get_intf(interface);

	dev->vsettings.vflip = vflip;
	dev->vsettings.hflip = hflip;
	dev->n_sbufs = 0;
	set_present(dev);

	/* Set up the endpoint information
	 * use only the first isoc-in endpoint
	 * for the current alternate setting */
	iface_desc = interface->cur_altsetting;

	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		if (!dev->isoc_ep
			&& usb_endpoint_is_isoc_in(endpoint)) {
			/* we found an isoc in endpoint */
			dev->isoc_ep = usb_endpoint_num(endpoint);
			break;
		}
	}
	if (!dev->isoc_ep) {
		STK_ERROR("Could not find isoc-in endpoint");
		err = -ENODEV;
		goto error;
	}
	dev->vsettings.brightness = 0x7fff;
	dev->vsettings.palette = V4L2_PIX_FMT_RGB565;
	dev->vsettings.mode = MODE_VGA;
	dev->frame_size = 640 * 480 * 2;

	INIT_LIST_HEAD(&dev->sio_avail);
	INIT_LIST_HEAD(&dev->sio_full);

	usb_set_intfdata(interface, dev);

	err = stk_register_video_device(dev);
	if (err) {
		goto error;
	}

	stk_create_sysfs_files(&dev->vdev);
	usb_autopm_enable(dev->interface);

	return 0;

error:
	kfree(dev);
	return err;
}

static void stk_camera_disconnect(struct usb_interface *interface)
{
	struct stk_camera *dev = usb_get_intfdata(interface);

	usb_set_intfdata(interface, NULL);
	unset_present(dev);

	wake_up_interruptible(&dev->wait_frame);
	stk_remove_sysfs_files(&dev->vdev);

	STK_INFO("Syntek USB2.0 Camera release resources "
		"video device /dev/video%d\n", dev->vdev.num);

	video_unregister_device(&dev->vdev);
}

#ifdef CONFIG_PM
static int stk_camera_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct stk_camera *dev = usb_get_intfdata(intf);
	if (is_streaming(dev)) {
		stk_stop_stream(dev);
		/* yes, this is ugly */
		set_streaming(dev);
	}
	return 0;
}

static int stk_camera_resume(struct usb_interface *intf)
{
	struct stk_camera *dev = usb_get_intfdata(intf);
	if (!is_initialised(dev))
		return 0;
	unset_initialised(dev);
	stk_initialise(dev);
	stk_setup_format(dev);
	if (is_streaming(dev))
		stk_start_stream(dev);
	return 0;
}
#endif

static struct usb_driver stk_camera_driver = {
	.name = "stkwebcam",
	.probe = stk_camera_probe,
	.disconnect = stk_camera_disconnect,
	.id_table = stkwebcam_table,
#ifdef CONFIG_PM
	.suspend = stk_camera_suspend,
	.resume = stk_camera_resume,
#endif
};


static int __init stk_camera_init(void)
{
	int result;

	result = usb_register(&stk_camera_driver);
	if (result)
		STK_ERROR("usb_register failed ! Error number %d\n", result);


	return result;
}

static void __exit stk_camera_exit(void)
{
	usb_deregister(&stk_camera_driver);
}

module_init(stk_camera_init);
module_exit(stk_camera_exit);