summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/usbtv/usbtv-video.c
blob: 2a089756c988433dbb4e6502d6cd1156026efe1d (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
/*
 * Copyright (c) 2013 Lubomir Rintel
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * Fushicai USBTV007 Audio-Video Grabber Driver
 *
 * Product web site:
 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
 *
 * Following LWN articles were very useful in construction of this driver:
 * Video4Linux2 API series: http://lwn.net/Articles/203924/
 * videobuf2 API explanation: http://lwn.net/Articles/447435/
 * Thanks go to Jonathan Corbet for providing this quality documentation.
 * He is awesome.
 *
 * No physical hardware was harmed running Windows during the
 * reverse-engineering activity
 */

#include <media/v4l2-ioctl.h>
#include <media/videobuf2-v4l2.h>

#include "usbtv.h"

static struct usbtv_norm_params norm_params[] = {
	{
		.norm = V4L2_STD_525_60,
		.cap_width = 720,
		.cap_height = 480,
	},
	{
		.norm = V4L2_STD_PAL,
		.cap_width = 720,
		.cap_height = 576,
	}
};

static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm)
{
	int i, ret = 0;
	struct usbtv_norm_params *params = NULL;

	for (i = 0; i < ARRAY_SIZE(norm_params); i++) {
		if (norm_params[i].norm & norm) {
			params = &norm_params[i];
			break;
		}
	}

	if (params) {
		usbtv->width = params->cap_width;
		usbtv->height = params->cap_height;
		usbtv->n_chunks = usbtv->width * usbtv->height
						/ 4 / USBTV_CHUNK;
		usbtv->norm = params->norm;
	} else
		ret = -EINVAL;

	return ret;
}

static int usbtv_select_input(struct usbtv *usbtv, int input)
{
	int ret;

	static const u16 composite[][2] = {
		{ USBTV_BASE + 0x0105, 0x0060 },
		{ USBTV_BASE + 0x011f, 0x00f2 },
		{ USBTV_BASE + 0x0127, 0x0060 },
		{ USBTV_BASE + 0x00ae, 0x0010 },
		{ USBTV_BASE + 0x0239, 0x0060 },
	};

	static const u16 svideo[][2] = {
		{ USBTV_BASE + 0x0105, 0x0010 },
		{ USBTV_BASE + 0x011f, 0x00ff },
		{ USBTV_BASE + 0x0127, 0x0060 },
		{ USBTV_BASE + 0x00ae, 0x0030 },
		{ USBTV_BASE + 0x0239, 0x0060 },
	};

	switch (input) {
	case USBTV_COMPOSITE_INPUT:
		ret = usbtv_set_regs(usbtv, composite, ARRAY_SIZE(composite));
		break;
	case USBTV_SVIDEO_INPUT:
		ret = usbtv_set_regs(usbtv, svideo, ARRAY_SIZE(svideo));
		break;
	default:
		ret = -EINVAL;
	}

	if (!ret)
		usbtv->input = input;

	return ret;
}

static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
{
	int ret;
	static const u16 pal[][2] = {
		{ USBTV_BASE + 0x001a, 0x0068 },
		{ USBTV_BASE + 0x010e, 0x0072 },
		{ USBTV_BASE + 0x010f, 0x00a2 },
		{ USBTV_BASE + 0x0112, 0x00b0 },
		{ USBTV_BASE + 0x0117, 0x0001 },
		{ USBTV_BASE + 0x0118, 0x002c },
		{ USBTV_BASE + 0x012d, 0x0010 },
		{ USBTV_BASE + 0x012f, 0x0020 },
		{ USBTV_BASE + 0x024f, 0x0002 },
		{ USBTV_BASE + 0x0254, 0x0059 },
		{ USBTV_BASE + 0x025a, 0x0016 },
		{ USBTV_BASE + 0x025b, 0x0035 },
		{ USBTV_BASE + 0x0263, 0x0017 },
		{ USBTV_BASE + 0x0266, 0x0016 },
		{ USBTV_BASE + 0x0267, 0x0036 }
	};

	static const u16 ntsc[][2] = {
		{ USBTV_BASE + 0x001a, 0x0079 },
		{ USBTV_BASE + 0x010e, 0x0068 },
		{ USBTV_BASE + 0x010f, 0x009c },
		{ USBTV_BASE + 0x0112, 0x00f0 },
		{ USBTV_BASE + 0x0117, 0x0000 },
		{ USBTV_BASE + 0x0118, 0x00fc },
		{ USBTV_BASE + 0x012d, 0x0004 },
		{ USBTV_BASE + 0x012f, 0x0008 },
		{ USBTV_BASE + 0x024f, 0x0001 },
		{ USBTV_BASE + 0x0254, 0x005f },
		{ USBTV_BASE + 0x025a, 0x0012 },
		{ USBTV_BASE + 0x025b, 0x0001 },
		{ USBTV_BASE + 0x0263, 0x001c },
		{ USBTV_BASE + 0x0266, 0x0011 },
		{ USBTV_BASE + 0x0267, 0x0005 }
	};

	ret = usbtv_configure_for_norm(usbtv, norm);

	if (!ret) {
		if (norm & V4L2_STD_525_60)
			ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
		else if (norm & V4L2_STD_PAL)
			ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
	}

	return ret;
}

static int usbtv_setup_capture(struct usbtv *usbtv)
{
	int ret;
	static const u16 setup[][2] = {
		/* These seem to enable the device. */
		{ USBTV_BASE + 0x0008, 0x0001 },
		{ USBTV_BASE + 0x01d0, 0x00ff },
		{ USBTV_BASE + 0x01d9, 0x0002 },

		/* These seem to influence color parameters, such as
		 * brightness, etc. */
		{ USBTV_BASE + 0x0239, 0x0040 },
		{ USBTV_BASE + 0x0240, 0x0000 },
		{ USBTV_BASE + 0x0241, 0x0000 },
		{ USBTV_BASE + 0x0242, 0x0002 },
		{ USBTV_BASE + 0x0243, 0x0080 },
		{ USBTV_BASE + 0x0244, 0x0012 },
		{ USBTV_BASE + 0x0245, 0x0090 },
		{ USBTV_BASE + 0x0246, 0x0000 },

		{ USBTV_BASE + 0x0278, 0x002d },
		{ USBTV_BASE + 0x0279, 0x000a },
		{ USBTV_BASE + 0x027a, 0x0032 },
		{ 0xf890, 0x000c },
		{ 0xf894, 0x0086 },

		{ USBTV_BASE + 0x00ac, 0x00c0 },
		{ USBTV_BASE + 0x00ad, 0x0000 },
		{ USBTV_BASE + 0x00a2, 0x0012 },
		{ USBTV_BASE + 0x00a3, 0x00e0 },
		{ USBTV_BASE + 0x00a4, 0x0028 },
		{ USBTV_BASE + 0x00a5, 0x0082 },
		{ USBTV_BASE + 0x00a7, 0x0080 },
		{ USBTV_BASE + 0x0000, 0x0014 },
		{ USBTV_BASE + 0x0006, 0x0003 },
		{ USBTV_BASE + 0x0090, 0x0099 },
		{ USBTV_BASE + 0x0091, 0x0090 },
		{ USBTV_BASE + 0x0094, 0x0068 },
		{ USBTV_BASE + 0x0095, 0x0070 },
		{ USBTV_BASE + 0x009c, 0x0030 },
		{ USBTV_BASE + 0x009d, 0x00c0 },
		{ USBTV_BASE + 0x009e, 0x00e0 },
		{ USBTV_BASE + 0x0019, 0x0006 },
		{ USBTV_BASE + 0x008c, 0x00ba },
		{ USBTV_BASE + 0x0101, 0x00ff },
		{ USBTV_BASE + 0x010c, 0x00b3 },
		{ USBTV_BASE + 0x01b2, 0x0080 },
		{ USBTV_BASE + 0x01b4, 0x00a0 },
		{ USBTV_BASE + 0x014c, 0x00ff },
		{ USBTV_BASE + 0x014d, 0x00ca },
		{ USBTV_BASE + 0x0113, 0x0053 },
		{ USBTV_BASE + 0x0119, 0x008a },
		{ USBTV_BASE + 0x013c, 0x0003 },
		{ USBTV_BASE + 0x0150, 0x009c },
		{ USBTV_BASE + 0x0151, 0x0071 },
		{ USBTV_BASE + 0x0152, 0x00c6 },
		{ USBTV_BASE + 0x0153, 0x0084 },
		{ USBTV_BASE + 0x0154, 0x00bc },
		{ USBTV_BASE + 0x0155, 0x00a0 },
		{ USBTV_BASE + 0x0156, 0x00a0 },
		{ USBTV_BASE + 0x0157, 0x009c },
		{ USBTV_BASE + 0x0158, 0x001f },
		{ USBTV_BASE + 0x0159, 0x0006 },
		{ USBTV_BASE + 0x015d, 0x0000 },

		{ USBTV_BASE + 0x0003, 0x0004 },
		{ USBTV_BASE + 0x0100, 0x00d3 },
		{ USBTV_BASE + 0x0115, 0x0015 },
		{ USBTV_BASE + 0x0220, 0x002e },
		{ USBTV_BASE + 0x0225, 0x0008 },
		{ USBTV_BASE + 0x024e, 0x0002 },
		{ USBTV_BASE + 0x024e, 0x0002 },
		{ USBTV_BASE + 0x024f, 0x0002 },
	};

	ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
	if (ret)
		return ret;

	ret = usbtv_select_norm(usbtv, usbtv->norm);
	if (ret)
		return ret;

	ret = usbtv_select_input(usbtv, usbtv->input);
	if (ret)
		return ret;

	return 0;
}

/* Copy data from chunk into a frame buffer, deinterlacing the data
 * into every second line. Unfortunately, they don't align nicely into
 * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
 * Therefore, we break down the chunk into two halves before copying,
 * so that we can interleave a line if needed.
 *
 * Each "chunk" is 240 words; a word in this context equals 4 bytes.
 * Image format is YUYV/YUV 4:2:2, consisting of Y Cr Y Cb, defining two
 * pixels, the Cr and Cb shared between the two pixels, but each having
 * separate Y values. Thus, the 240 words equal 480 pixels. It therefore,
 * takes 1.5 chunks to make a 720 pixel-wide line for the frame.
 * The image is interlaced, so there is a "scan" of odd lines, followed
 * by "scan" of even numbered lines.
 *
 * Following code is writing the chunks in correct sequence, skipping
 * the rows based on "odd" value.
 * line 1: chunk[0][  0..479] chunk[0][480..959] chunk[1][  0..479]
 * line 3: chunk[1][480..959] chunk[2][  0..479] chunk[2][480..959]
 * ...etc.
 */
static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd)
{
	int half;

	for (half = 0; half < 2; half++) {
		int part_no = chunk_no * 2 + half;
		int line = part_no / 3;
		int part_index = (line * 2 + !odd) * 3 + (part_no % 3);

		u32 *dst = &frame[part_index * USBTV_CHUNK/2];

		memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
		src += USBTV_CHUNK/2;
	}
}

/* Called for each 256-byte image chunk.
 * First word identifies the chunk, followed by 240 words of image
 * data and padding. */
static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk)
{
	int frame_id, odd, chunk_no;
	u32 *frame;
	struct usbtv_buf *buf;
	unsigned long flags;

	/* Ignore corrupted lines. */
	if (!USBTV_MAGIC_OK(chunk))
		return;
	frame_id = USBTV_FRAME_ID(chunk);
	odd = USBTV_ODD(chunk);
	chunk_no = USBTV_CHUNK_NO(chunk);
	if (chunk_no >= usbtv->n_chunks)
		return;

	/* Beginning of a frame. */
	if (chunk_no == 0) {
		usbtv->frame_id = frame_id;
		usbtv->chunks_done = 0;
	}

	if (usbtv->frame_id != frame_id)
		return;

	spin_lock_irqsave(&usbtv->buflock, flags);
	if (list_empty(&usbtv->bufs)) {
		/* No free buffers. Userspace likely too slow. */
		spin_unlock_irqrestore(&usbtv->buflock, flags);
		return;
	}

	/* First available buffer. */
	buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
	frame = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);

	/* Copy the chunk data. */
	usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
	usbtv->chunks_done++;

	/* Last chunk in a field */
	if (chunk_no == usbtv->n_chunks-1) {
		/* Last chunk in a frame, signalling an end */
		if (odd && !usbtv->last_odd) {
			int size = vb2_plane_size(&buf->vb.vb2_buf, 0);
			enum vb2_buffer_state state = usbtv->chunks_done ==
				usbtv->n_chunks ?
				VB2_BUF_STATE_DONE :
				VB2_BUF_STATE_ERROR;

			buf->vb.field = V4L2_FIELD_INTERLACED;
			buf->vb.sequence = usbtv->sequence++;
			buf->vb.vb2_buf.timestamp = ktime_get_ns();
			vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
			vb2_buffer_done(&buf->vb.vb2_buf, state);
			list_del(&buf->list);
		}
		usbtv->last_odd = odd;
	}

	spin_unlock_irqrestore(&usbtv->buflock, flags);
}

/* Got image data. Each packet contains a number of 256-word chunks we
 * compose the image from. */
static void usbtv_iso_cb(struct urb *ip)
{
	int ret;
	int i;
	struct usbtv *usbtv = (struct usbtv *)ip->context;

	switch (ip->status) {
	/* All fine. */
	case 0:
		break;
	/* Device disconnected or capture stopped? */
	case -ENODEV:
	case -ENOENT:
	case -ECONNRESET:
	case -ESHUTDOWN:
		return;
	/* Unknown error. Retry. */
	default:
		dev_warn(usbtv->dev, "Bad response for ISO request.\n");
		goto resubmit;
	}

	for (i = 0; i < ip->number_of_packets; i++) {
		int size = ip->iso_frame_desc[i].actual_length;
		unsigned char *data = ip->transfer_buffer +
				ip->iso_frame_desc[i].offset;
		int offset;

		for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
			usbtv_image_chunk(usbtv,
				(__be32 *)&data[USBTV_CHUNK_SIZE * offset]);
	}

resubmit:
	ret = usb_submit_urb(ip, GFP_ATOMIC);
	if (ret < 0)
		dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
}

static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
{
	struct urb *ip;
	int size = usbtv->iso_size;
	int i;

	ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
	if (ip == NULL)
		return NULL;

	ip->dev = usbtv->udev;
	ip->context = usbtv;
	ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
	ip->interval = 1;
	ip->transfer_flags = URB_ISO_ASAP;
	ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
						GFP_KERNEL);
	if (!ip->transfer_buffer) {
		usb_free_urb(ip);
		return NULL;
	}
	ip->complete = usbtv_iso_cb;
	ip->number_of_packets = USBTV_ISOC_PACKETS;
	ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
	for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
		ip->iso_frame_desc[i].offset = size * i;
		ip->iso_frame_desc[i].length = size;
	}

	return ip;
}

static void usbtv_stop(struct usbtv *usbtv)
{
	int i;
	unsigned long flags;

	/* Cancel running transfers. */
	for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
		struct urb *ip = usbtv->isoc_urbs[i];

		if (ip == NULL)
			continue;
		usb_kill_urb(ip);
		kfree(ip->transfer_buffer);
		usb_free_urb(ip);
		usbtv->isoc_urbs[i] = NULL;
	}

	/* Return buffers to userspace. */
	spin_lock_irqsave(&usbtv->buflock, flags);
	while (!list_empty(&usbtv->bufs)) {
		struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
						struct usbtv_buf, list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
		list_del(&buf->list);
	}
	spin_unlock_irqrestore(&usbtv->buflock, flags);
}

static int usbtv_start(struct usbtv *usbtv)
{
	int i;
	int ret;

	usbtv_audio_suspend(usbtv);

	ret = usb_set_interface(usbtv->udev, 0, 0);
	if (ret < 0)
		return ret;

	ret = usbtv_setup_capture(usbtv);
	if (ret < 0)
		return ret;

	ret = usb_set_interface(usbtv->udev, 0, 1);
	if (ret < 0)
		return ret;

	usbtv_audio_resume(usbtv);

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

		ip = usbtv_setup_iso_transfer(usbtv);
		if (ip == NULL) {
			ret = -ENOMEM;
			goto start_fail;
		}
		usbtv->isoc_urbs[i] = ip;

		ret = usb_submit_urb(ip, GFP_KERNEL);
		if (ret < 0)
			goto start_fail;
	}

	return 0;

start_fail:
	usbtv_stop(usbtv);
	return ret;
}

static int usbtv_querycap(struct file *file, void *priv,
				struct v4l2_capability *cap)
{
	struct usbtv *dev = video_drvdata(file);

	strlcpy(cap->driver, "usbtv", sizeof(cap->driver));
	strlcpy(cap->card, "usbtv", sizeof(cap->card));
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE;
	cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int usbtv_enum_input(struct file *file, void *priv,
					struct v4l2_input *i)
{
	struct usbtv *dev = video_drvdata(file);

	switch (i->index) {
	case USBTV_COMPOSITE_INPUT:
		strlcpy(i->name, "Composite", sizeof(i->name));
		break;
	case USBTV_SVIDEO_INPUT:
		strlcpy(i->name, "S-Video", sizeof(i->name));
		break;
	default:
		return -EINVAL;
	}

	i->type = V4L2_INPUT_TYPE_CAMERA;
	i->std = dev->vdev.tvnorms;
	return 0;
}

static int usbtv_enum_fmt_vid_cap(struct file *file, void  *priv,
					struct v4l2_fmtdesc *f)
{
	if (f->index > 0)
		return -EINVAL;

	strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed",
					sizeof(f->description));
	f->pixelformat = V4L2_PIX_FMT_YUYV;
	return 0;
}

static int usbtv_fmt_vid_cap(struct file *file, void *priv,
					struct v4l2_format *f)
{
	struct usbtv *usbtv = video_drvdata(file);

	f->fmt.pix.width = usbtv->width;
	f->fmt.pix.height = usbtv->height;
	f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	f->fmt.pix.bytesperline = usbtv->width * 2;
	f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

	return 0;
}

static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
	struct usbtv *usbtv = video_drvdata(file);
	*norm = usbtv->norm;
	return 0;
}

static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
	int ret = -EINVAL;
	struct usbtv *usbtv = video_drvdata(file);

	if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL))
		ret = usbtv_select_norm(usbtv, norm);

	return ret;
}

static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct usbtv *usbtv = video_drvdata(file);
	*i = usbtv->input;
	return 0;
}

static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
{
	struct usbtv *usbtv = video_drvdata(file);

	return usbtv_select_input(usbtv, i);
}

static struct v4l2_ioctl_ops usbtv_ioctl_ops = {
	.vidioc_querycap = usbtv_querycap,
	.vidioc_enum_input = usbtv_enum_input,
	.vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
	.vidioc_g_std = usbtv_g_std,
	.vidioc_s_std = usbtv_s_std,
	.vidioc_g_input = usbtv_g_input,
	.vidioc_s_input = usbtv_s_input,

	.vidioc_reqbufs = vb2_ioctl_reqbufs,
	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
	.vidioc_querybuf = vb2_ioctl_querybuf,
	.vidioc_create_bufs = vb2_ioctl_create_bufs,
	.vidioc_qbuf = vb2_ioctl_qbuf,
	.vidioc_dqbuf = vb2_ioctl_dqbuf,
	.vidioc_streamon = vb2_ioctl_streamon,
	.vidioc_streamoff = vb2_ioctl_streamoff,
};

static struct v4l2_file_operations usbtv_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = video_ioctl2,
	.mmap = vb2_fop_mmap,
	.open = v4l2_fh_open,
	.release = vb2_fop_release,
	.read = vb2_fop_read,
	.poll = vb2_fop_poll,
};

static int usbtv_queue_setup(struct vb2_queue *vq,
	unsigned int *nbuffers,
	unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
{
	struct usbtv *usbtv = vb2_get_drv_priv(vq);
	unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);

	if (vq->num_buffers + *nbuffers < 2)
		*nbuffers = 2 - vq->num_buffers;
	if (*nplanes)
		return sizes[0] < size ? -EINVAL : 0;
	*nplanes = 1;
	sizes[0] = size;

	return 0;
}

static void usbtv_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
	struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb);
	unsigned long flags;

	if (usbtv->udev == NULL) {
		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
		return;
	}

	spin_lock_irqsave(&usbtv->buflock, flags);
	list_add_tail(&buf->list, &usbtv->bufs);
	spin_unlock_irqrestore(&usbtv->buflock, flags);
}

static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct usbtv *usbtv = vb2_get_drv_priv(vq);

	if (usbtv->udev == NULL)
		return -ENODEV;

	usbtv->last_odd = 1;
	usbtv->sequence = 0;
	return usbtv_start(usbtv);
}

static void usbtv_stop_streaming(struct vb2_queue *vq)
{
	struct usbtv *usbtv = vb2_get_drv_priv(vq);

	if (usbtv->udev)
		usbtv_stop(usbtv);
}

static struct vb2_ops usbtv_vb2_ops = {
	.queue_setup = usbtv_queue_setup,
	.buf_queue = usbtv_buf_queue,
	.start_streaming = usbtv_start_streaming,
	.stop_streaming = usbtv_stop_streaming,
};

static void usbtv_release(struct v4l2_device *v4l2_dev)
{
	struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);

	v4l2_device_unregister(&usbtv->v4l2_dev);
	vb2_queue_release(&usbtv->vb2q);
	kfree(usbtv);
}

int usbtv_video_init(struct usbtv *usbtv)
{
	int ret;

	(void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);

	spin_lock_init(&usbtv->buflock);
	mutex_init(&usbtv->v4l2_lock);
	mutex_init(&usbtv->vb2q_lock);
	INIT_LIST_HEAD(&usbtv->bufs);

	/* videobuf2 structure */
	usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
	usbtv->vb2q.drv_priv = usbtv;
	usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
	usbtv->vb2q.ops = &usbtv_vb2_ops;
	usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
	usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	usbtv->vb2q.lock = &usbtv->vb2q_lock;
	ret = vb2_queue_init(&usbtv->vb2q);
	if (ret < 0) {
		dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
		return ret;
	}

	/* v4l2 structure */
	usbtv->v4l2_dev.release = usbtv_release;
	ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
	if (ret < 0) {
		dev_warn(usbtv->dev, "Could not register v4l2 device\n");
		goto v4l2_fail;
	}

	/* Video structure */
	strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
	usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
	usbtv->vdev.release = video_device_release_empty;
	usbtv->vdev.fops = &usbtv_fops;
	usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
	usbtv->vdev.tvnorms = USBTV_TV_STD;
	usbtv->vdev.queue = &usbtv->vb2q;
	usbtv->vdev.lock = &usbtv->v4l2_lock;
	video_set_drvdata(&usbtv->vdev, usbtv);
	ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
	if (ret < 0) {
		dev_warn(usbtv->dev, "Could not register video device\n");
		goto vdev_fail;
	}

	return 0;

vdev_fail:
	v4l2_device_unregister(&usbtv->v4l2_dev);
v4l2_fail:
	vb2_queue_release(&usbtv->vb2q);

	return ret;
}

void usbtv_video_free(struct usbtv *usbtv)
{
	mutex_lock(&usbtv->vb2q_lock);
	mutex_lock(&usbtv->v4l2_lock);

	usbtv_stop(usbtv);
	video_unregister_device(&usbtv->vdev);
	v4l2_device_disconnect(&usbtv->v4l2_dev);

	mutex_unlock(&usbtv->v4l2_lock);
	mutex_unlock(&usbtv->vb2q_lock);

	v4l2_device_put(&usbtv->v4l2_dev);
}