summaryrefslogtreecommitdiff
path: root/drivers/media/usb/pvrusb2/pvrusb2-v4l2.c
blob: 9fdc57c1658fcc3d8dc028e126259255459c3f07 (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
/*
 *
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
 *
 *  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
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include "pvrusb2-context.h"
#include "pvrusb2-hdw.h"
#include "pvrusb2.h"
#include "pvrusb2-debug.h"
#include "pvrusb2-v4l2.h"
#include "pvrusb2-ioread.h"
#include <linux/videodev2.h>
#include <linux/module.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>

struct pvr2_v4l2_dev;
struct pvr2_v4l2_fh;
struct pvr2_v4l2;

struct pvr2_v4l2_dev {
	struct video_device devbase; /* MUST be first! */
	struct pvr2_v4l2 *v4lp;
	struct pvr2_context_stream *stream;
	/* Information about this device: */
	enum pvr2_config config; /* Expected stream format */
	int v4l_type; /* V4L defined type for this device node */
	enum pvr2_v4l_type minor_type; /* pvr2-understood minor device type */
};

struct pvr2_v4l2_fh {
	struct v4l2_fh fh;
	struct pvr2_channel channel;
	struct pvr2_v4l2_dev *pdi;
	struct pvr2_ioread *rhp;
	struct file *file;
	wait_queue_head_t wait_data;
	int fw_mode_flag;
	/* Map contiguous ordinal value to input id */
	unsigned char *input_map;
	unsigned int input_cnt;
};

struct pvr2_v4l2 {
	struct pvr2_channel channel;

	/* streams - Note that these must be separately, individually,
	 * allocated pointers.  This is because the v4l core is going to
	 * manage their deletion - separately, individually...  */
	struct pvr2_v4l2_dev *dev_video;
	struct pvr2_v4l2_dev *dev_radio;
};

static int video_nr[PVR_NUM] = {[0 ... PVR_NUM-1] = -1};
module_param_array(video_nr, int, NULL, 0444);
MODULE_PARM_DESC(video_nr, "Offset for device's video dev minor");
static int radio_nr[PVR_NUM] = {[0 ... PVR_NUM-1] = -1};
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(radio_nr, "Offset for device's radio dev minor");
static int vbi_nr[PVR_NUM] = {[0 ... PVR_NUM-1] = -1};
module_param_array(vbi_nr, int, NULL, 0444);
MODULE_PARM_DESC(vbi_nr, "Offset for device's vbi dev minor");

#define PVR_FORMAT_PIX  0
#define PVR_FORMAT_VBI  1

static struct v4l2_format pvr_format [] = {
	[PVR_FORMAT_PIX] = {
		.type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
		.fmt    = {
			.pix        = {
				.width          = 720,
				.height         = 576,
				.pixelformat    = V4L2_PIX_FMT_MPEG,
				.field          = V4L2_FIELD_INTERLACED,
				/* FIXME : Don't know what to put here... */
				.sizeimage      = 32 * 1024,
			}
		}
	},
	[PVR_FORMAT_VBI] = {
		.type   = V4L2_BUF_TYPE_VBI_CAPTURE,
		.fmt    = {
			.vbi        = {
				.sampling_rate = 27000000,
				.offset = 248,
				.samples_per_line = 1443,
				.sample_format = V4L2_PIX_FMT_GREY,
				.start = { 0, 0 },
				.count = { 0, 0 },
				.flags = 0,
			}
		}
	}
};



/*
 * This is part of Video 4 Linux API. These procedures handle ioctl() calls.
 */
static int pvr2_querycap(struct file *file, void *priv, struct v4l2_capability *cap)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	strlcpy(cap->driver, "pvrusb2", sizeof(cap->driver));
	strlcpy(cap->bus_info, pvr2_hdw_get_bus_info(hdw),
			sizeof(cap->bus_info));
	strlcpy(cap->card, pvr2_hdw_get_desc(hdw), sizeof(cap->card));
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER |
			    V4L2_CAP_AUDIO | V4L2_CAP_RADIO |
			    V4L2_CAP_READWRITE | V4L2_CAP_DEVICE_CAPS;
	switch (fh->pdi->devbase.vfl_type) {
	case VFL_TYPE_GRABBER:
		cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_AUDIO;
		break;
	case VFL_TYPE_RADIO:
		cap->device_caps = V4L2_CAP_RADIO;
		break;
	default:
		return -EINVAL;
	}
	cap->device_caps |= V4L2_CAP_TUNER | V4L2_CAP_READWRITE;
	return 0;
}

static int pvr2_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int val = 0;
	int ret;

	ret = pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_STDCUR), &val);
	*std = val;
	return ret;
}

static int pvr2_s_std(struct file *file, void *priv, v4l2_std_id std)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	return pvr2_ctrl_set_value(
		pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_STDCUR), std);
}

static int pvr2_querystd(struct file *file, void *priv, v4l2_std_id *std)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int val = 0;
	int ret;

	ret = pvr2_ctrl_get_value(
		pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_STDDETECT), &val);
	*std = val;
	return ret;
}

static int pvr2_enum_input(struct file *file, void *priv, struct v4l2_input *vi)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct pvr2_ctrl *cptr;
	struct v4l2_input tmp;
	unsigned int cnt;
	int val;

	cptr = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_INPUT);

	memset(&tmp, 0, sizeof(tmp));
	tmp.index = vi->index;
	if (vi->index >= fh->input_cnt)
		return -EINVAL;
	val = fh->input_map[vi->index];
	switch (val) {
	case PVR2_CVAL_INPUT_TV:
	case PVR2_CVAL_INPUT_DTV:
	case PVR2_CVAL_INPUT_RADIO:
		tmp.type = V4L2_INPUT_TYPE_TUNER;
		break;
	case PVR2_CVAL_INPUT_SVIDEO:
	case PVR2_CVAL_INPUT_COMPOSITE:
		tmp.type = V4L2_INPUT_TYPE_CAMERA;
		break;
	default:
		return -EINVAL;
	}

	cnt = 0;
	pvr2_ctrl_get_valname(cptr, val,
			tmp.name, sizeof(tmp.name) - 1, &cnt);
	tmp.name[cnt] = 0;

	/* Don't bother with audioset, since this driver currently
	   always switches the audio whenever the video is
	   switched. */

	/* Handling std is a tougher problem.  It doesn't make
	   sense in cases where a device might be multi-standard.
	   We could just copy out the current value for the
	   standard, but it can change over time.  For now just
	   leave it zero. */
	*vi = tmp;
	return 0;
}

static int pvr2_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	unsigned int idx;
	struct pvr2_ctrl *cptr;
	int val;
	int ret;

	cptr = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_INPUT);
	val = 0;
	ret = pvr2_ctrl_get_value(cptr, &val);
	*i = 0;
	for (idx = 0; idx < fh->input_cnt; idx++) {
		if (fh->input_map[idx] == val) {
			*i = idx;
			break;
		}
	}
	return ret;
}

static int pvr2_s_input(struct file *file, void *priv, unsigned int inp)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	if (inp >= fh->input_cnt)
		return -EINVAL;
	return pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_INPUT),
			fh->input_map[inp]);
}

static int pvr2_enumaudio(struct file *file, void *priv, struct v4l2_audio *vin)
{
	/* pkt: FIXME: We are returning one "fake" input here
	   which could very well be called "whatever_we_like".
	   This is for apps that want to see an audio input
	   just to feel comfortable, as well as to test if
	   it can do stereo or sth. There is actually no guarantee
	   that the actual audio input cannot change behind the app's
	   back, but most applications should not mind that either.

	   Hopefully, mplayer people will work with us on this (this
	   whole mess is to support mplayer pvr://), or Hans will come
	   up with a more standard way to say "we have inputs but we
	   don 't want you to change them independent of video" which
	   will sort this mess.
	 */

	if (vin->index > 0)
		return -EINVAL;
	strncpy(vin->name, "PVRUSB2 Audio", 14);
	vin->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

static int pvr2_g_audio(struct file *file, void *priv, struct v4l2_audio *vin)
{
	/* pkt: FIXME: see above comment (VIDIOC_ENUMAUDIO) */
	vin->index = 0;
	strncpy(vin->name, "PVRUSB2 Audio", 14);
	vin->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

static int pvr2_s_audio(struct file *file, void *priv, const struct v4l2_audio *vout)
{
	if (vout->index)
		return -EINVAL;
	return 0;
}

static int pvr2_g_tuner(struct file *file, void *priv, struct v4l2_tuner *vt)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	if (vt->index != 0)
		return -EINVAL; /* Only answer for the 1st tuner */

	pvr2_hdw_execute_tuner_poll(hdw);
	return pvr2_hdw_get_tuner_status(hdw, vt);
}

static int pvr2_s_tuner(struct file *file, void *priv, const struct v4l2_tuner *vt)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	if (vt->index != 0)
		return -EINVAL;

	return pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_AUDIOMODE),
			vt->audmode);
}

static int pvr2_s_frequency(struct file *file, void *priv, const struct v4l2_frequency *vf)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	unsigned long fv;
	struct v4l2_tuner vt;
	int cur_input;
	struct pvr2_ctrl *ctrlp;
	int ret;

	ret = pvr2_hdw_get_tuner_status(hdw, &vt);
	if (ret != 0)
		return ret;
	ctrlp = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_INPUT);
	ret = pvr2_ctrl_get_value(ctrlp, &cur_input);
	if (ret != 0)
		return ret;
	if (vf->type == V4L2_TUNER_RADIO) {
		if (cur_input != PVR2_CVAL_INPUT_RADIO)
			pvr2_ctrl_set_value(ctrlp, PVR2_CVAL_INPUT_RADIO);
	} else {
		if (cur_input == PVR2_CVAL_INPUT_RADIO)
			pvr2_ctrl_set_value(ctrlp, PVR2_CVAL_INPUT_TV);
	}
	fv = vf->frequency;
	if (vt.capability & V4L2_TUNER_CAP_LOW)
		fv = (fv * 125) / 2;
	else
		fv = fv * 62500;
	return pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw,PVR2_CID_FREQUENCY),fv);
}

static int pvr2_g_frequency(struct file *file, void *priv, struct v4l2_frequency *vf)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int val = 0;
	int cur_input;
	struct v4l2_tuner vt;
	int ret;

	ret = pvr2_hdw_get_tuner_status(hdw, &vt);
	if (ret != 0)
		return ret;
	ret = pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_FREQUENCY),
			&val);
	if (ret != 0)
		return ret;
	pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_INPUT),
			&cur_input);
	if (cur_input == PVR2_CVAL_INPUT_RADIO)
		vf->type = V4L2_TUNER_RADIO;
	else
		vf->type = V4L2_TUNER_ANALOG_TV;
	if (vt.capability & V4L2_TUNER_CAP_LOW)
		val = (val * 2) / 125;
	else
		val /= 62500;
	vf->frequency = val;
	return 0;
}

static int pvr2_enum_fmt_vid_cap(struct file *file, void *priv, struct v4l2_fmtdesc *fd)
{
	/* Only one format is supported: MPEG. */
	if (fd->index)
		return -EINVAL;

	fd->pixelformat = V4L2_PIX_FMT_MPEG;
	return 0;
}

static int pvr2_g_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *vf)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int val;

	memcpy(vf, &pvr_format[PVR_FORMAT_PIX], sizeof(struct v4l2_format));
	val = 0;
	pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_HRES),
			&val);
	vf->fmt.pix.width = val;
	val = 0;
	pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_VRES),
			&val);
	vf->fmt.pix.height = val;
	return 0;
}

static int pvr2_try_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *vf)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int lmin, lmax, ldef;
	struct pvr2_ctrl *hcp, *vcp;
	int h = vf->fmt.pix.height;
	int w = vf->fmt.pix.width;

	hcp = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_HRES);
	vcp = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_VRES);

	lmin = pvr2_ctrl_get_min(hcp);
	lmax = pvr2_ctrl_get_max(hcp);
	pvr2_ctrl_get_def(hcp, &ldef);
	if (w == -1)
		w = ldef;
	else if (w < lmin)
		w = lmin;
	else if (w > lmax)
		w = lmax;
	lmin = pvr2_ctrl_get_min(vcp);
	lmax = pvr2_ctrl_get_max(vcp);
	pvr2_ctrl_get_def(vcp, &ldef);
	if (h == -1)
		h = ldef;
	else if (h < lmin)
		h = lmin;
	else if (h > lmax)
		h = lmax;

	memcpy(vf, &pvr_format[PVR_FORMAT_PIX],
			sizeof(struct v4l2_format));
	vf->fmt.pix.width = w;
	vf->fmt.pix.height = h;
	return 0;
}

static int pvr2_s_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *vf)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct pvr2_ctrl *hcp, *vcp;
	int ret = pvr2_try_fmt_vid_cap(file, fh, vf);

	if (ret)
		return ret;
	hcp = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_HRES);
	vcp = pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_VRES);
	pvr2_ctrl_set_value(hcp, vf->fmt.pix.width);
	pvr2_ctrl_set_value(vcp, vf->fmt.pix.height);
	return 0;
}

static int pvr2_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct pvr2_v4l2_dev *pdi = fh->pdi;
	int ret;

	if (!fh->pdi->stream) {
		/* No stream defined for this node.  This means
		   that we're not currently allowed to stream from
		   this node. */
		return -EPERM;
	}
	ret = pvr2_hdw_set_stream_type(hdw, pdi->config);
	if (ret < 0)
		return ret;
	return pvr2_hdw_set_streaming(hdw, !0);
}

static int pvr2_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	if (!fh->pdi->stream) {
		/* No stream defined for this node.  This means
		   that we're not currently allowed to stream from
		   this node. */
		return -EPERM;
	}
	return pvr2_hdw_set_streaming(hdw, 0);
}

static int pvr2_queryctrl(struct file *file, void *priv,
		struct v4l2_queryctrl *vc)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct pvr2_ctrl *cptr;
	int val;

	if (vc->id & V4L2_CTRL_FLAG_NEXT_CTRL) {
		cptr = pvr2_hdw_get_ctrl_nextv4l(
				hdw, (vc->id & ~V4L2_CTRL_FLAG_NEXT_CTRL));
		if (cptr)
			vc->id = pvr2_ctrl_get_v4lid(cptr);
	} else {
		cptr = pvr2_hdw_get_ctrl_v4l(hdw, vc->id);
	}
	if (!cptr) {
		pvr2_trace(PVR2_TRACE_V4LIOCTL,
				"QUERYCTRL id=0x%x not implemented here",
				vc->id);
		return -EINVAL;
	}

	pvr2_trace(PVR2_TRACE_V4LIOCTL,
			"QUERYCTRL id=0x%x mapping name=%s (%s)",
			vc->id, pvr2_ctrl_get_name(cptr),
			pvr2_ctrl_get_desc(cptr));
	strlcpy(vc->name, pvr2_ctrl_get_desc(cptr), sizeof(vc->name));
	vc->flags = pvr2_ctrl_get_v4lflags(cptr);
	pvr2_ctrl_get_def(cptr, &val);
	vc->default_value = val;
	switch (pvr2_ctrl_get_type(cptr)) {
	case pvr2_ctl_enum:
		vc->type = V4L2_CTRL_TYPE_MENU;
		vc->minimum = 0;
		vc->maximum = pvr2_ctrl_get_cnt(cptr) - 1;
		vc->step = 1;
		break;
	case pvr2_ctl_bool:
		vc->type = V4L2_CTRL_TYPE_BOOLEAN;
		vc->minimum = 0;
		vc->maximum = 1;
		vc->step = 1;
		break;
	case pvr2_ctl_int:
		vc->type = V4L2_CTRL_TYPE_INTEGER;
		vc->minimum = pvr2_ctrl_get_min(cptr);
		vc->maximum = pvr2_ctrl_get_max(cptr);
		vc->step = 1;
		break;
	default:
		pvr2_trace(PVR2_TRACE_V4LIOCTL,
				"QUERYCTRL id=0x%x name=%s not mappable",
				vc->id, pvr2_ctrl_get_name(cptr));
		return -EINVAL;
	}
	return 0;
}

static int pvr2_querymenu(struct file *file, void *priv, struct v4l2_querymenu *vm)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	unsigned int cnt = 0;
	int ret;

	ret = pvr2_ctrl_get_valname(pvr2_hdw_get_ctrl_v4l(hdw, vm->id),
			vm->index,
			vm->name, sizeof(vm->name) - 1,
			&cnt);
	vm->name[cnt] = 0;
	return ret;
}

static int pvr2_g_ctrl(struct file *file, void *priv, struct v4l2_control *vc)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int val = 0;
	int ret;

	ret = pvr2_ctrl_get_value(pvr2_hdw_get_ctrl_v4l(hdw, vc->id),
			&val);
	vc->value = val;
	return ret;
}

static int pvr2_s_ctrl(struct file *file, void *priv, struct v4l2_control *vc)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	return pvr2_ctrl_set_value(pvr2_hdw_get_ctrl_v4l(hdw, vc->id),
			vc->value);
}

static int pvr2_g_ext_ctrls(struct file *file, void *priv,
					struct v4l2_ext_controls *ctls)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct v4l2_ext_control *ctrl;
	struct pvr2_ctrl *cptr;
	unsigned int idx;
	int val;
	int ret;

	ret = 0;
	for (idx = 0; idx < ctls->count; idx++) {
		ctrl = ctls->controls + idx;
		cptr = pvr2_hdw_get_ctrl_v4l(hdw, ctrl->id);
		if (cptr) {
			if (ctls->which == V4L2_CTRL_WHICH_DEF_VAL)
				pvr2_ctrl_get_def(cptr, &val);
			else
				ret = pvr2_ctrl_get_value(cptr, &val);
		} else
			ret = -EINVAL;

		if (ret) {
			ctls->error_idx = idx;
			return ret;
		}
		/* Ensure that if read as a 64 bit value, the user
		   will still get a hopefully sane value */
		ctrl->value64 = 0;
		ctrl->value = val;
	}
	return 0;
}

static int pvr2_s_ext_ctrls(struct file *file, void *priv,
		struct v4l2_ext_controls *ctls)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct v4l2_ext_control *ctrl;
	unsigned int idx;
	int ret;

	/* Default value cannot be changed */
	if (ctls->which == V4L2_CTRL_WHICH_DEF_VAL)
		return -EINVAL;

	ret = 0;
	for (idx = 0; idx < ctls->count; idx++) {
		ctrl = ctls->controls + idx;
		ret = pvr2_ctrl_set_value(
				pvr2_hdw_get_ctrl_v4l(hdw, ctrl->id),
				ctrl->value);
		if (ret) {
			ctls->error_idx = idx;
			return ret;
		}
	}
	return 0;
}

static int pvr2_try_ext_ctrls(struct file *file, void *priv,
		struct v4l2_ext_controls *ctls)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct v4l2_ext_control *ctrl;
	struct pvr2_ctrl *pctl;
	unsigned int idx;

	/* For the moment just validate that the requested control
	   actually exists. */
	for (idx = 0; idx < ctls->count; idx++) {
		ctrl = ctls->controls + idx;
		pctl = pvr2_hdw_get_ctrl_v4l(hdw, ctrl->id);
		if (!pctl) {
			ctls->error_idx = idx;
			return -EINVAL;
		}
	}
	return 0;
}

static int pvr2_cropcap(struct file *file, void *priv, struct v4l2_cropcap *cap)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int ret;

	if (cap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;
	ret = pvr2_hdw_get_cropcap(hdw, cap);
	cap->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; /* paranoia */
	return ret;
}

static int pvr2_g_selection(struct file *file, void *priv,
			    struct v4l2_selection *sel)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	struct v4l2_cropcap cap;
	int val = 0;
	int ret;

	if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
		return -EINVAL;

	cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP:
		ret = pvr2_ctrl_get_value(
			  pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPL), &val);
		if (ret != 0)
			return -EINVAL;
		sel->r.left = val;
		ret = pvr2_ctrl_get_value(
			  pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPT), &val);
		if (ret != 0)
			return -EINVAL;
		sel->r.top = val;
		ret = pvr2_ctrl_get_value(
			  pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPW), &val);
		if (ret != 0)
			return -EINVAL;
		sel->r.width = val;
		ret = pvr2_ctrl_get_value(
			  pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPH), &val);
		if (ret != 0)
			return -EINVAL;
		sel->r.height = val;
		break;
	case V4L2_SEL_TGT_CROP_DEFAULT:
		ret = pvr2_hdw_get_cropcap(hdw, &cap);
		sel->r = cap.defrect;
		break;
	case V4L2_SEL_TGT_CROP_BOUNDS:
		ret = pvr2_hdw_get_cropcap(hdw, &cap);
		sel->r = cap.bounds;
		break;
	default:
		return -EINVAL;
	}
	return ret;
}

static int pvr2_s_selection(struct file *file, void *priv,
			    struct v4l2_selection *sel)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	int ret;

	if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
	    sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;
	ret = pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPL),
			sel->r.left);
	if (ret != 0)
		return -EINVAL;
	ret = pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPT),
			sel->r.top);
	if (ret != 0)
		return -EINVAL;
	ret = pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPW),
			sel->r.width);
	if (ret != 0)
		return -EINVAL;
	ret = pvr2_ctrl_set_value(
			pvr2_hdw_get_ctrl_by_id(hdw, PVR2_CID_CROPH),
			sel->r.height);
	if (ret != 0)
		return -EINVAL;
	return 0;
}

static int pvr2_log_status(struct file *file, void *priv)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;

	pvr2_hdw_trigger_module_log(hdw);
	return 0;
}

static const struct v4l2_ioctl_ops pvr2_ioctl_ops = {
	.vidioc_querycap		    = pvr2_querycap,
	.vidioc_s_audio			    = pvr2_s_audio,
	.vidioc_g_audio			    = pvr2_g_audio,
	.vidioc_enumaudio		    = pvr2_enumaudio,
	.vidioc_enum_input		    = pvr2_enum_input,
	.vidioc_cropcap			    = pvr2_cropcap,
	.vidioc_s_selection		    = pvr2_s_selection,
	.vidioc_g_selection		    = pvr2_g_selection,
	.vidioc_g_input			    = pvr2_g_input,
	.vidioc_s_input			    = pvr2_s_input,
	.vidioc_g_frequency		    = pvr2_g_frequency,
	.vidioc_s_frequency		    = pvr2_s_frequency,
	.vidioc_s_tuner			    = pvr2_s_tuner,
	.vidioc_g_tuner			    = pvr2_g_tuner,
	.vidioc_g_std			    = pvr2_g_std,
	.vidioc_s_std			    = pvr2_s_std,
	.vidioc_querystd		    = pvr2_querystd,
	.vidioc_log_status		    = pvr2_log_status,
	.vidioc_enum_fmt_vid_cap	    = pvr2_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap		    = pvr2_g_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		    = pvr2_s_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap		    = pvr2_try_fmt_vid_cap,
	.vidioc_streamon		    = pvr2_streamon,
	.vidioc_streamoff		    = pvr2_streamoff,
	.vidioc_queryctrl		    = pvr2_queryctrl,
	.vidioc_querymenu		    = pvr2_querymenu,
	.vidioc_g_ctrl			    = pvr2_g_ctrl,
	.vidioc_s_ctrl			    = pvr2_s_ctrl,
	.vidioc_g_ext_ctrls		    = pvr2_g_ext_ctrls,
	.vidioc_s_ext_ctrls		    = pvr2_s_ext_ctrls,
	.vidioc_try_ext_ctrls		    = pvr2_try_ext_ctrls,
};

static void pvr2_v4l2_dev_destroy(struct pvr2_v4l2_dev *dip)
{
	struct pvr2_hdw *hdw = dip->v4lp->channel.mc_head->hdw;
	enum pvr2_config cfg = dip->config;
	char msg[80];
	unsigned int mcnt;

	/* Construct the unregistration message *before* we actually
	   perform the unregistration step.  By doing it this way we don't
	   have to worry about potentially touching deleted resources. */
	mcnt = scnprintf(msg, sizeof(msg) - 1,
			 "pvrusb2: unregistered device %s [%s]",
			 video_device_node_name(&dip->devbase),
			 pvr2_config_get_name(cfg));
	msg[mcnt] = 0;

	pvr2_hdw_v4l_store_minor_number(hdw,dip->minor_type,-1);

	/* Paranoia */
	dip->v4lp = NULL;
	dip->stream = NULL;

	/* Actual deallocation happens later when all internal references
	   are gone. */
	video_unregister_device(&dip->devbase);

	printk(KERN_INFO "%s\n", msg);

}


static void pvr2_v4l2_dev_disassociate_parent(struct pvr2_v4l2_dev *dip)
{
	if (!dip) return;
	if (!dip->devbase.v4l2_dev->dev) return;
	dip->devbase.v4l2_dev->dev = NULL;
	device_move(&dip->devbase.dev, NULL, DPM_ORDER_NONE);
}


static void pvr2_v4l2_destroy_no_lock(struct pvr2_v4l2 *vp)
{
	if (vp->dev_video) {
		pvr2_v4l2_dev_destroy(vp->dev_video);
		vp->dev_video = NULL;
	}
	if (vp->dev_radio) {
		pvr2_v4l2_dev_destroy(vp->dev_radio);
		vp->dev_radio = NULL;
	}

	pvr2_trace(PVR2_TRACE_STRUCT,"Destroying pvr2_v4l2 id=%p",vp);
	pvr2_channel_done(&vp->channel);
	kfree(vp);
}


static void pvr2_video_device_release(struct video_device *vdev)
{
	struct pvr2_v4l2_dev *dev;
	dev = container_of(vdev,struct pvr2_v4l2_dev,devbase);
	kfree(dev);
}


static void pvr2_v4l2_internal_check(struct pvr2_channel *chp)
{
	struct pvr2_v4l2 *vp;
	vp = container_of(chp,struct pvr2_v4l2,channel);
	if (!vp->channel.mc_head->disconnect_flag) return;
	pvr2_v4l2_dev_disassociate_parent(vp->dev_video);
	pvr2_v4l2_dev_disassociate_parent(vp->dev_radio);
	if (!list_empty(&vp->dev_video->devbase.fh_list) ||
	    !list_empty(&vp->dev_radio->devbase.fh_list))
		return;
	pvr2_v4l2_destroy_no_lock(vp);
}


static long pvr2_v4l2_ioctl(struct file *file,
			   unsigned int cmd, unsigned long arg)
{

	struct pvr2_v4l2_fh *fh = file->private_data;
	struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
	long ret = -EINVAL;

	if (pvrusb2_debug & PVR2_TRACE_V4LIOCTL)
		v4l_printk_ioctl(pvr2_hdw_get_driver_name(hdw), cmd);

	if (!pvr2_hdw_dev_ok(hdw)) {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "ioctl failed - bad or no context");
		return -EFAULT;
	}

	ret = video_ioctl2(file, cmd, arg);

	pvr2_hdw_commit_ctl(hdw);

	if (ret < 0) {
		if (pvrusb2_debug & PVR2_TRACE_V4LIOCTL) {
			pvr2_trace(PVR2_TRACE_V4LIOCTL,
				   "pvr2_v4l2_do_ioctl failure, ret=%ld command was:",
ret);
			v4l_printk_ioctl(pvr2_hdw_get_driver_name(hdw), cmd);
		}
	} else {
		pvr2_trace(PVR2_TRACE_V4LIOCTL,
			   "pvr2_v4l2_do_ioctl complete, ret=%ld (0x%lx)",
			   ret, ret);
	}
	return ret;

}


static int pvr2_v4l2_release(struct file *file)
{
	struct pvr2_v4l2_fh *fhp = file->private_data;
	struct pvr2_v4l2 *vp = fhp->pdi->v4lp;
	struct pvr2_hdw *hdw = fhp->channel.mc_head->hdw;

	pvr2_trace(PVR2_TRACE_OPEN_CLOSE,"pvr2_v4l2_release");

	if (fhp->rhp) {
		struct pvr2_stream *sp;
		pvr2_hdw_set_streaming(hdw,0);
		sp = pvr2_ioread_get_stream(fhp->rhp);
		if (sp) pvr2_stream_set_callback(sp,NULL,NULL);
		pvr2_ioread_destroy(fhp->rhp);
		fhp->rhp = NULL;
	}

	v4l2_fh_del(&fhp->fh);
	v4l2_fh_exit(&fhp->fh);
	file->private_data = NULL;

	pvr2_channel_done(&fhp->channel);
	pvr2_trace(PVR2_TRACE_STRUCT,
		   "Destroying pvr_v4l2_fh id=%p",fhp);
	if (fhp->input_map) {
		kfree(fhp->input_map);
		fhp->input_map = NULL;
	}
	kfree(fhp);
	if (vp->channel.mc_head->disconnect_flag &&
	    list_empty(&vp->dev_video->devbase.fh_list) &&
	    list_empty(&vp->dev_radio->devbase.fh_list)) {
		pvr2_v4l2_destroy_no_lock(vp);
	}
	return 0;
}


static int pvr2_v4l2_open(struct file *file)
{
	struct pvr2_v4l2_dev *dip; /* Our own context pointer */
	struct pvr2_v4l2_fh *fhp;
	struct pvr2_v4l2 *vp;
	struct pvr2_hdw *hdw;
	unsigned int input_mask = 0;
	unsigned int input_cnt,idx;
	int ret = 0;

	dip = container_of(video_devdata(file),struct pvr2_v4l2_dev,devbase);

	vp = dip->v4lp;
	hdw = vp->channel.hdw;

	pvr2_trace(PVR2_TRACE_OPEN_CLOSE,"pvr2_v4l2_open");

	if (!pvr2_hdw_dev_ok(hdw)) {
		pvr2_trace(PVR2_TRACE_OPEN_CLOSE,
			   "pvr2_v4l2_open: hardware not ready");
		return -EIO;
	}

	fhp = kzalloc(sizeof(*fhp),GFP_KERNEL);
	if (!fhp) {
		return -ENOMEM;
	}

	v4l2_fh_init(&fhp->fh, &dip->devbase);
	init_waitqueue_head(&fhp->wait_data);
	fhp->pdi = dip;

	pvr2_trace(PVR2_TRACE_STRUCT,"Creating pvr_v4l2_fh id=%p",fhp);
	pvr2_channel_init(&fhp->channel,vp->channel.mc_head);

	if (dip->v4l_type == VFL_TYPE_RADIO) {
		/* Opening device as a radio, legal input selection subset
		   is just the radio. */
		input_mask = (1 << PVR2_CVAL_INPUT_RADIO);
	} else {
		/* Opening the main V4L device, legal input selection
		   subset includes all analog inputs. */
		input_mask = ((1 << PVR2_CVAL_INPUT_RADIO) |
			      (1 << PVR2_CVAL_INPUT_TV) |
			      (1 << PVR2_CVAL_INPUT_COMPOSITE) |
			      (1 << PVR2_CVAL_INPUT_SVIDEO));
	}
	ret = pvr2_channel_limit_inputs(&fhp->channel,input_mask);
	if (ret) {
		pvr2_channel_done(&fhp->channel);
		pvr2_trace(PVR2_TRACE_STRUCT,
			   "Destroying pvr_v4l2_fh id=%p (input mask error)",
			   fhp);
		v4l2_fh_exit(&fhp->fh);
		kfree(fhp);
		return ret;
	}

	input_mask &= pvr2_hdw_get_input_available(hdw);
	input_cnt = 0;
	for (idx = 0; idx < (sizeof(input_mask) << 3); idx++) {
		if (input_mask & (1 << idx)) input_cnt++;
	}
	fhp->input_cnt = input_cnt;
	fhp->input_map = kzalloc(input_cnt,GFP_KERNEL);
	if (!fhp->input_map) {
		pvr2_channel_done(&fhp->channel);
		pvr2_trace(PVR2_TRACE_STRUCT,
			   "Destroying pvr_v4l2_fh id=%p (input map failure)",
			   fhp);
		v4l2_fh_exit(&fhp->fh);
		kfree(fhp);
		return -ENOMEM;
	}
	input_cnt = 0;
	for (idx = 0; idx < (sizeof(input_mask) << 3); idx++) {
		if (!(input_mask & (1 << idx))) continue;
		fhp->input_map[input_cnt++] = idx;
	}

	fhp->file = file;
	file->private_data = fhp;

	fhp->fw_mode_flag = pvr2_hdw_cpufw_get_enabled(hdw);
	v4l2_fh_add(&fhp->fh);

	return 0;
}


static void pvr2_v4l2_notify(struct pvr2_v4l2_fh *fhp)
{
	wake_up(&fhp->wait_data);
}

static int pvr2_v4l2_iosetup(struct pvr2_v4l2_fh *fh)
{
	int ret;
	struct pvr2_stream *sp;
	struct pvr2_hdw *hdw;
	if (fh->rhp) return 0;

	if (!fh->pdi->stream) {
		/* No stream defined for this node.  This means that we're
		   not currently allowed to stream from this node. */
		return -EPERM;
	}

	/* First read() attempt.  Try to claim the stream and start
	   it... */
	if ((ret = pvr2_channel_claim_stream(&fh->channel,
					     fh->pdi->stream)) != 0) {
		/* Someone else must already have it */
		return ret;
	}

	fh->rhp = pvr2_channel_create_mpeg_stream(fh->pdi->stream);
	if (!fh->rhp) {
		pvr2_channel_claim_stream(&fh->channel,NULL);
		return -ENOMEM;
	}

	hdw = fh->channel.mc_head->hdw;
	sp = fh->pdi->stream->stream;
	pvr2_stream_set_callback(sp,(pvr2_stream_callback)pvr2_v4l2_notify,fh);
	pvr2_hdw_set_stream_type(hdw,fh->pdi->config);
	if ((ret = pvr2_hdw_set_streaming(hdw,!0)) < 0) return ret;
	return pvr2_ioread_set_enabled(fh->rhp,!0);
}


static ssize_t pvr2_v4l2_read(struct file *file,
			      char __user *buff, size_t count, loff_t *ppos)
{
	struct pvr2_v4l2_fh *fh = file->private_data;
	int ret;

	if (fh->fw_mode_flag) {
		struct pvr2_hdw *hdw = fh->channel.mc_head->hdw;
		char *tbuf;
		int c1,c2;
		int tcnt = 0;
		unsigned int offs = *ppos;

		tbuf = kmalloc(PAGE_SIZE,GFP_KERNEL);
		if (!tbuf) return -ENOMEM;

		while (count) {
			c1 = count;
			if (c1 > PAGE_SIZE) c1 = PAGE_SIZE;
			c2 = pvr2_hdw_cpufw_get(hdw,offs,tbuf,c1);
			if (c2 < 0) {
				tcnt = c2;
				break;
			}
			if (!c2) break;
			if (copy_to_user(buff,tbuf,c2)) {
				tcnt = -EFAULT;
				break;
			}
			offs += c2;
			tcnt += c2;
			buff += c2;
			count -= c2;
			*ppos += c2;
		}
		kfree(tbuf);
		return tcnt;
	}

	if (!fh->rhp) {
		ret = pvr2_v4l2_iosetup(fh);
		if (ret) {
			return ret;
		}
	}

	for (;;) {
		ret = pvr2_ioread_read(fh->rhp,buff,count);
		if (ret >= 0) break;
		if (ret != -EAGAIN) break;
		if (file->f_flags & O_NONBLOCK) break;
		/* Doing blocking I/O.  Wait here. */
		ret = wait_event_interruptible(
			fh->wait_data,
			pvr2_ioread_avail(fh->rhp) >= 0);
		if (ret < 0) break;
	}

	return ret;
}


static __poll_t pvr2_v4l2_poll(struct file *file, poll_table *wait)
{
	__poll_t mask = 0;
	struct pvr2_v4l2_fh *fh = file->private_data;
	int ret;

	if (fh->fw_mode_flag) {
		mask |= EPOLLIN | EPOLLRDNORM;
		return mask;
	}

	if (!fh->rhp) {
		ret = pvr2_v4l2_iosetup(fh);
		if (ret) return EPOLLERR;
	}

	poll_wait(file,&fh->wait_data,wait);

	if (pvr2_ioread_avail(fh->rhp) >= 0) {
		mask |= EPOLLIN | EPOLLRDNORM;
	}

	return mask;
}


static const struct v4l2_file_operations vdev_fops = {
	.owner      = THIS_MODULE,
	.open       = pvr2_v4l2_open,
	.release    = pvr2_v4l2_release,
	.read       = pvr2_v4l2_read,
	.unlocked_ioctl = pvr2_v4l2_ioctl,
	.poll       = pvr2_v4l2_poll,
};


static const struct video_device vdev_template = {
	.fops       = &vdev_fops,
};


static void pvr2_v4l2_dev_init(struct pvr2_v4l2_dev *dip,
			       struct pvr2_v4l2 *vp,
			       int v4l_type)
{
	int mindevnum;
	int unit_number;
	struct pvr2_hdw *hdw;
	int *nr_ptr = NULL;
	dip->v4lp = vp;

	hdw = vp->channel.mc_head->hdw;
	dip->v4l_type = v4l_type;
	switch (v4l_type) {
	case VFL_TYPE_GRABBER:
		dip->stream = &vp->channel.mc_head->video_stream;
		dip->config = pvr2_config_mpeg;
		dip->minor_type = pvr2_v4l_type_video;
		nr_ptr = video_nr;
		if (!dip->stream) {
			pr_err(KBUILD_MODNAME
				": Failed to set up pvrusb2 v4l video dev due to missing stream instance\n");
			return;
		}
		break;
	case VFL_TYPE_VBI:
		dip->config = pvr2_config_vbi;
		dip->minor_type = pvr2_v4l_type_vbi;
		nr_ptr = vbi_nr;
		break;
	case VFL_TYPE_RADIO:
		dip->stream = &vp->channel.mc_head->video_stream;
		dip->config = pvr2_config_mpeg;
		dip->minor_type = pvr2_v4l_type_radio;
		nr_ptr = radio_nr;
		break;
	default:
		/* Bail out (this should be impossible) */
		pr_err(KBUILD_MODNAME ": Failed to set up pvrusb2 v4l dev due to unrecognized config\n");
		return;
	}

	dip->devbase = vdev_template;
	dip->devbase.release = pvr2_video_device_release;
	dip->devbase.ioctl_ops = &pvr2_ioctl_ops;
	{
		int val;
		pvr2_ctrl_get_value(
			pvr2_hdw_get_ctrl_by_id(hdw,
						PVR2_CID_STDAVAIL), &val);
		dip->devbase.tvnorms = (v4l2_std_id)val;
	}

	mindevnum = -1;
	unit_number = pvr2_hdw_get_unit_number(hdw);
	if (nr_ptr && (unit_number >= 0) && (unit_number < PVR_NUM)) {
		mindevnum = nr_ptr[unit_number];
	}
	pvr2_hdw_set_v4l2_dev(hdw, &dip->devbase);
	if ((video_register_device(&dip->devbase,
				   dip->v4l_type, mindevnum) < 0) &&
	    (video_register_device(&dip->devbase,
				   dip->v4l_type, -1) < 0)) {
		pr_err(KBUILD_MODNAME
			": Failed to register pvrusb2 v4l device\n");
	}

	printk(KERN_INFO "pvrusb2: registered device %s [%s]\n",
	       video_device_node_name(&dip->devbase),
	       pvr2_config_get_name(dip->config));

	pvr2_hdw_v4l_store_minor_number(hdw,
					dip->minor_type,dip->devbase.minor);
}


struct pvr2_v4l2 *pvr2_v4l2_create(struct pvr2_context *mnp)
{
	struct pvr2_v4l2 *vp;

	vp = kzalloc(sizeof(*vp),GFP_KERNEL);
	if (!vp) return vp;
	pvr2_channel_init(&vp->channel,mnp);
	pvr2_trace(PVR2_TRACE_STRUCT,"Creating pvr2_v4l2 id=%p",vp);

	vp->channel.check_func = pvr2_v4l2_internal_check;

	/* register streams */
	vp->dev_video = kzalloc(sizeof(*vp->dev_video),GFP_KERNEL);
	if (!vp->dev_video) goto fail;
	pvr2_v4l2_dev_init(vp->dev_video,vp,VFL_TYPE_GRABBER);
	if (pvr2_hdw_get_input_available(vp->channel.mc_head->hdw) &
	    (1 << PVR2_CVAL_INPUT_RADIO)) {
		vp->dev_radio = kzalloc(sizeof(*vp->dev_radio),GFP_KERNEL);
		if (!vp->dev_radio) goto fail;
		pvr2_v4l2_dev_init(vp->dev_radio,vp,VFL_TYPE_RADIO);
	}

	return vp;
 fail:
	pvr2_trace(PVR2_TRACE_STRUCT,"Failure creating pvr2_v4l2 id=%p",vp);
	pvr2_v4l2_destroy_no_lock(vp);
	return NULL;
}