[mirror_ubuntu-zesty-kernel.git] / drivers / media / video / bt8xx / bttv-vbi.c

/*

    bttv - Bt848 frame grabber driver
    vbi interface

    (c) 2002 Gerd Knorr <kraxel@bytesex.org>

    Copyright (C) 2005, 2006 Michael H. Schimek <mschimek@gmx.at>
    Sponsored by OPQ Systems AB

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/kdev_t.h>
#include <asm/io.h>
#include "bttvp.h"

/* Offset from line sync pulse leading edge (0H) to start of VBI capture,
   in fCLKx2 pixels.  According to the datasheet, VBI capture starts
   VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET
   is 64 fCLKx1 pixels wide.  VBI_HDELAY is set to 0, so this should be
   (64 + 0) * 2 = 128 fCLKx2 pixels.  But it's not!  The datasheet is
   Just Plain Wrong.  The real value appears to be different for
   different revisions of the bt8x8 chips, and to be affected by the
   horizontal scaling factor.  Experimentally, the value is measured
   to be about 244.  */
#define VBI_OFFSET 244

/* 2048 for compatibility with earlier driver versions. The driver
   really stores 1024 + tvnorm->vbipack * 4 samples per line in the
   buffer. Note tvnorm->vbipack is <= 0xFF (limit of VBIPACK_LO + HI
   is 0x1FF DWORDs) and VBI read()s store a frame counter in the last
   four bytes of the VBI image. */
#define VBI_BPL 2048

/* Compatibility. */
#define VBI_DEFLINES 16

static unsigned int vbibufs = 4;
static unsigned int vbi_debug;

module_param(vbibufs,   int, 0444);
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");

#ifdef dprintk
# undef dprintk
#endif
#define dprintk(fmt, arg...)	if (vbi_debug) \
	printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)

#define IMAGE_SIZE(fmt) \
	(((fmt)->count[0] + (fmt)->count[1]) * (fmt)->samples_per_line)

/* ----------------------------------------------------------------------- */
/* vbi risc code + mm                                                      */

static int vbi_buffer_setup(struct videobuf_queue *q,
			    unsigned int *count, unsigned int *size)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;

	if (0 == *count)
		*count = vbibufs;

	*size = IMAGE_SIZE(&fh->vbi_fmt.fmt);

	dprintk("setup: samples=%u start=%d,%d count=%u,%u\n",
		fh->vbi_fmt.fmt.samples_per_line,
		fh->vbi_fmt.fmt.start[0],
		fh->vbi_fmt.fmt.start[1],
		fh->vbi_fmt.fmt.count[0],
		fh->vbi_fmt.fmt.count[1]);

	return 0;
}

static int vbi_buffer_prepare(struct videobuf_queue *q,
			      struct videobuf_buffer *vb,
			      enum v4l2_field field)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	const struct bttv_tvnorm *tvnorm;
	unsigned int skip_lines0, skip_lines1, min_vdelay;
	int redo_dma_risc;
	int rc;

	buf->vb.size = IMAGE_SIZE(&fh->vbi_fmt.fmt);
	if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
		return -EINVAL;

	tvnorm = fh->vbi_fmt.tvnorm;

	/* There's no VBI_VDELAY register, RISC must skip the lines
	   we don't want. With default parameters we skip zero lines
	   as earlier driver versions did. The driver permits video
	   standard changes while capturing, so we use vbi_fmt.tvnorm
	   instead of btv->tvnorm to skip zero lines after video
	   standard changes as well. */

	skip_lines0 = 0;
	skip_lines1 = 0;

	if (fh->vbi_fmt.fmt.count[0] > 0)
		skip_lines0 = max(0, (fh->vbi_fmt.fmt.start[0]
				      - tvnorm->vbistart[0]));
	if (fh->vbi_fmt.fmt.count[1] > 0)
		skip_lines1 = max(0, (fh->vbi_fmt.fmt.start[1]
				      - tvnorm->vbistart[1]));

	redo_dma_risc = 0;

	if (buf->vbi_skip[0] != skip_lines0 ||
	    buf->vbi_skip[1] != skip_lines1 ||
	    buf->vbi_count[0] != fh->vbi_fmt.fmt.count[0] ||
	    buf->vbi_count[1] != fh->vbi_fmt.fmt.count[1]) {
		buf->vbi_skip[0] = skip_lines0;
		buf->vbi_skip[1] = skip_lines1;
		buf->vbi_count[0] = fh->vbi_fmt.fmt.count[0];
		buf->vbi_count[1] = fh->vbi_fmt.fmt.count[1];
		redo_dma_risc = 1;
	}

	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
		redo_dma_risc = 1;
		if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
			goto fail;
	}

	if (redo_dma_risc) {
		unsigned int bpl, padding, offset;
		struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);

		bpl = 2044; /* max. vbipack */
		padding = VBI_BPL - bpl;

		if (fh->vbi_fmt.fmt.count[0] > 0) {
			rc = bttv_risc_packed(btv, &buf->top,
					      dma->sglist,
					      /* offset */ 0, bpl,
					      padding, skip_lines0,
					      fh->vbi_fmt.fmt.count[0]);
			if (0 != rc)
				goto fail;
		}

		if (fh->vbi_fmt.fmt.count[1] > 0) {
			offset = fh->vbi_fmt.fmt.count[0] * VBI_BPL;

			rc = bttv_risc_packed(btv, &buf->bottom,
					      dma->sglist,
					      offset, bpl,
					      padding, skip_lines1,
					      fh->vbi_fmt.fmt.count[1]);
			if (0 != rc)
				goto fail;
		}
	}

	/* VBI capturing ends at VDELAY, start of video capturing,
	   no matter where the RISC program ends. VDELAY minimum is 2,
	   bounds.top is the corresponding first field line number
	   times two. VDELAY counts half field lines. */
	min_vdelay = MIN_VDELAY;
	if (fh->vbi_fmt.end >= tvnorm->cropcap.bounds.top)
		min_vdelay += fh->vbi_fmt.end - tvnorm->cropcap.bounds.top;

	/* For bttv_buffer_activate_vbi(). */
	buf->geo.vdelay = min_vdelay;

	buf->vb.state = VIDEOBUF_PREPARED;
	buf->vb.field = field;
	dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
		vb, &buf->top, &buf->bottom,
		v4l2_field_names[buf->vb.field]);
	return 0;

 fail:
	bttv_dma_free(q,btv,buf);
	return rc;
}

static void
vbi_buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);

	dprintk("queue %p\n",vb);
	buf->vb.state = VIDEOBUF_QUEUED;
	list_add_tail(&buf->vb.queue,&btv->vcapture);
	if (NULL == btv->cvbi) {
		fh->btv->loop_irq |= 4;
		bttv_set_dma(btv,0x0c);
	}
}

static void vbi_buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
	struct bttv_fh *fh = q->priv_data;
	struct bttv *btv = fh->btv;
	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);

	dprintk("free %p\n",vb);
	bttv_dma_free(q,fh->btv,buf);
}

struct videobuf_queue_ops bttv_vbi_qops = {
	.buf_setup    = vbi_buffer_setup,
	.buf_prepare  = vbi_buffer_prepare,
	.buf_queue    = vbi_buffer_queue,
	.buf_release  = vbi_buffer_release,
};

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

static int try_fmt(struct v4l2_vbi_format *f, const struct bttv_tvnorm *tvnorm,
			__s32 crop_start)
{
	__s32 min_start, max_start, max_end, f2_offset;
	unsigned int i;

	/* For compatibility with earlier driver versions we must pretend
	   the VBI and video capture window may overlap. In reality RISC
	   magic aborts VBI capturing at the first line of video capturing,
	   leaving the rest of the buffer unchanged, usually all zero.
	   VBI capturing must always start before video capturing. >> 1
	   because cropping counts field lines times two. */
	min_start = tvnorm->vbistart[0];
	max_start = (crop_start >> 1) - 1;
	max_end = (tvnorm->cropcap.bounds.top
		   + tvnorm->cropcap.bounds.height) >> 1;

	if (min_start > max_start)
		return -EBUSY;

	BUG_ON(max_start >= max_end);

	f->sampling_rate    = tvnorm->Fsc;
	f->samples_per_line = VBI_BPL;
	f->sample_format    = V4L2_PIX_FMT_GREY;
	f->offset           = VBI_OFFSET;

	f2_offset = tvnorm->vbistart[1] - tvnorm->vbistart[0];

	for (i = 0; i < 2; ++i) {
		if (0 == f->count[i]) {
			/* No data from this field. We leave f->start[i]
			   alone because VIDIOCSVBIFMT is w/o and EINVALs
			   when a driver does not support exactly the
			   requested parameters. */
		} else {
			s64 start, count;

			start = clamp(f->start[i], min_start, max_start);
			/* s64 to prevent overflow. */
			count = (s64) f->start[i] + f->count[i] - start;
			f->start[i] = start;
			f->count[i] = clamp(count, (s64) 1,
					    max_end - start);
		}

		min_start += f2_offset;
		max_start += f2_offset;
		max_end += f2_offset;
	}

	if (0 == (f->count[0] | f->count[1])) {
		/* As in earlier driver versions. */
		f->start[0] = tvnorm->vbistart[0];
		f->start[1] = tvnorm->vbistart[1];
		f->count[0] = 1;
		f->count[1] = 1;
	}

	f->flags = 0;

	f->reserved[0] = 0;
	f->reserved[1] = 0;

	return 0;
}

int bttv_try_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{
	struct bttv_fh *fh = f;
	struct bttv *btv = fh->btv;
	const struct bttv_tvnorm *tvnorm;
	__s32 crop_start;

	mutex_lock(&btv->lock);

	tvnorm = &bttv_tvnorms[btv->tvnorm];
	crop_start = btv->crop_start;

	mutex_unlock(&btv->lock);

	return try_fmt(&frt->fmt.vbi, tvnorm, crop_start);
}


int bttv_s_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{
	struct bttv_fh *fh = f;
	struct bttv *btv = fh->btv;
	const struct bttv_tvnorm *tvnorm;
	__s32 start1, end;
	int rc;

	mutex_lock(&btv->lock);

	rc = -EBUSY;
	if (fh->resources & RESOURCE_VBI)
		goto fail;

	tvnorm = &bttv_tvnorms[btv->tvnorm];

	rc = try_fmt(&frt->fmt.vbi, tvnorm, btv->crop_start);
	if (0 != rc)
		goto fail;

	start1 = frt->fmt.vbi.start[1] - tvnorm->vbistart[1] +
		tvnorm->vbistart[0];

	/* First possible line of video capturing. Should be
	   max(f->start[0] + f->count[0], start1 + f->count[1]) * 2
	   when capturing both fields. But for compatibility we must
	   pretend the VBI and video capture window may overlap,
	   so end = start + 1, the lowest possible value, times two
	   because vbi_fmt.end counts field lines times two. */
	end = max(frt->fmt.vbi.start[0], start1) * 2 + 2;

	mutex_lock(&fh->vbi.vb_lock);

	fh->vbi_fmt.fmt    = frt->fmt.vbi;
	fh->vbi_fmt.tvnorm = tvnorm;
	fh->vbi_fmt.end    = end;

	mutex_unlock(&fh->vbi.vb_lock);

	rc = 0;

 fail:
	mutex_unlock(&btv->lock);

	return rc;
}


int bttv_g_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{
	struct bttv_fh *fh = f;
	const struct bttv_tvnorm *tvnorm;

	frt->fmt.vbi = fh->vbi_fmt.fmt;

	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];

	if (tvnorm != fh->vbi_fmt.tvnorm) {
		__s32 max_end;
		unsigned int i;

		/* As in vbi_buffer_prepare() this imitates the
		   behaviour of earlier driver versions after video
		   standard changes, with default parameters anyway. */

		max_end = (tvnorm->cropcap.bounds.top
			   + tvnorm->cropcap.bounds.height) >> 1;

		frt->fmt.vbi.sampling_rate = tvnorm->Fsc;

		for (i = 0; i < 2; ++i) {
			__s32 new_start;

			new_start = frt->fmt.vbi.start[i]
				+ tvnorm->vbistart[i]
				- fh->vbi_fmt.tvnorm->vbistart[i];

			frt->fmt.vbi.start[i] = min(new_start, max_end - 1);
			frt->fmt.vbi.count[i] =
				min((__s32) frt->fmt.vbi.count[i],
					  max_end - frt->fmt.vbi.start[i]);

			max_end += tvnorm->vbistart[1]
				- tvnorm->vbistart[0];
		}
	}
	return 0;
}

void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm)
{
	const struct bttv_tvnorm *tvnorm;
	unsigned int real_samples_per_line;
	unsigned int real_count;

	tvnorm = &bttv_tvnorms[norm];

	f->fmt.sampling_rate    = tvnorm->Fsc;
	f->fmt.samples_per_line = VBI_BPL;
	f->fmt.sample_format    = V4L2_PIX_FMT_GREY;
	f->fmt.offset           = VBI_OFFSET;
	f->fmt.start[0]		= tvnorm->vbistart[0];
	f->fmt.start[1]		= tvnorm->vbistart[1];
	f->fmt.count[0]		= VBI_DEFLINES;
	f->fmt.count[1]		= VBI_DEFLINES;
	f->fmt.flags            = 0;
	f->fmt.reserved[0]      = 0;
	f->fmt.reserved[1]      = 0;

	/* For compatibility the buffer size must be 2 * VBI_DEFLINES *
	   VBI_BPL regardless of the current video standard. */
	real_samples_per_line   = 1024 + tvnorm->vbipack * 4;
	real_count              = ((tvnorm->cropcap.defrect.top >> 1)
				   - tvnorm->vbistart[0]);

	BUG_ON(real_samples_per_line > VBI_BPL);
	BUG_ON(real_count > VBI_DEFLINES);

	f->tvnorm               = tvnorm;

	/* See bttv_vbi_fmt_set(). */
	f->end                  = tvnorm->vbistart[0] * 2 + 2;
}

/* ----------------------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
	1	/*
	2
	3	bttv - Bt848 frame grabber driver
	4	vbi interface
	5
	6	(c) 2002 Gerd Knorr <kraxel@bytesex.org>
	7
	8	Copyright (C) 2005, 2006 Michael H. Schimek <mschimek@gmx.at>
	9	Sponsored by OPQ Systems AB
	10
	11	This program is free software; you can redistribute it and/or modify
	12	it under the terms of the GNU General Public License as published by
	13	the Free Software Foundation; either version 2 of the License, or
	14	(at your option) any later version.
	15
	16	This program is distributed in the hope that it will be useful,
	17	but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	GNU General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with this program; if not, write to the Free Software
	23	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/errno.h>
	28	#include <linux/fs.h>
	29	#include <linux/kernel.h>
	30	#include <linux/interrupt.h>
	31	#include <linux/kdev_t.h>
	32	#include <asm/io.h>
	33	#include "bttvp.h"
	34
	35	/* Offset from line sync pulse leading edge (0H) to start of VBI capture,
	36	in fCLKx2 pixels. According to the datasheet, VBI capture starts
	37	VBI_HDELAY fCLKx1 pixels from the tailing edgeof /HRESET, and /HRESET
	38	is 64 fCLKx1 pixels wide. VBI_HDELAY is set to 0, so this should be
	39	(64 + 0) * 2 = 128 fCLKx2 pixels. But it's not! The datasheet is
	40	Just Plain Wrong. The real value appears to be different for
	41	different revisions of the bt8x8 chips, and to be affected by the
	42	horizontal scaling factor. Experimentally, the value is measured
	43	to be about 244. */
	44	#define VBI_OFFSET 244
	45
	46	/* 2048 for compatibility with earlier driver versions. The driver
	47	really stores 1024 + tvnorm->vbipack * 4 samples per line in the
	48	buffer. Note tvnorm->vbipack is <= 0xFF (limit of VBIPACK_LO + HI
	49	is 0x1FF DWORDs) and VBI read()s store a frame counter in the last
	50	four bytes of the VBI image. */
	51	#define VBI_BPL 2048
	52
	53	/* Compatibility. */
	54	#define VBI_DEFLINES 16
	55
	56	static unsigned int vbibufs = 4;
	57	static unsigned int vbi_debug;
	58
	59	module_param(vbibufs, int, 0444);
	60	module_param(vbi_debug, int, 0644);
	61	MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32, default 4");
	62	MODULE_PARM_DESC(vbi_debug,"vbi code debug messages, default is 0 (no)");
	63
	64	#ifdef dprintk
	65	# undef dprintk
	66	#endif
	67	#define dprintk(fmt, arg...) if (vbi_debug) \
	68	printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)
	69
	70	#define IMAGE_SIZE(fmt) \
	71	(((fmt)->count[0] + (fmt)->count[1]) * (fmt)->samples_per_line)
	72
	73	/* ----------------------------------------------------------------------- */
	74	/* vbi risc code + mm */
	75
	76	static int vbi_buffer_setup(struct videobuf_queue *q,
	77	unsigned int count, unsigned int size)
	78	{
	79	struct bttv_fh *fh = q->priv_data;
	80	struct bttv *btv = fh->btv;
	81
	82	if (0 == *count)
	83	*count = vbibufs;
	84
	85	*size = IMAGE_SIZE(&fh->vbi_fmt.fmt);
	86
	87	dprintk("setup: samples=%u start=%d,%d count=%u,%u\n",
	88	fh->vbi_fmt.fmt.samples_per_line,
	89	fh->vbi_fmt.fmt.start[0],
	90	fh->vbi_fmt.fmt.start[1],
	91	fh->vbi_fmt.fmt.count[0],
	92	fh->vbi_fmt.fmt.count[1]);
	93
	94	return 0;
	95	}
	96
	97	static int vbi_buffer_prepare(struct videobuf_queue *q,
	98	struct videobuf_buffer *vb,
	99	enum v4l2_field field)
	100	{
	101	struct bttv_fh *fh = q->priv_data;
	102	struct bttv *btv = fh->btv;
	103	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	104	const struct bttv_tvnorm *tvnorm;
	105	unsigned int skip_lines0, skip_lines1, min_vdelay;
	106	int redo_dma_risc;
	107	int rc;
	108
	109	buf->vb.size = IMAGE_SIZE(&fh->vbi_fmt.fmt);
	110	if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
	111	return -EINVAL;
	112
	113	tvnorm = fh->vbi_fmt.tvnorm;
	114
	115	/* There's no VBI_VDELAY register, RISC must skip the lines
	116	we don't want. With default parameters we skip zero lines
	117	as earlier driver versions did. The driver permits video
	118	standard changes while capturing, so we use vbi_fmt.tvnorm
	119	instead of btv->tvnorm to skip zero lines after video
	120	standard changes as well. */
	121
	122	skip_lines0 = 0;
	123	skip_lines1 = 0;
	124
	125	if (fh->vbi_fmt.fmt.count[0] > 0)
	126	skip_lines0 = max(0, (fh->vbi_fmt.fmt.start[0]
	127	- tvnorm->vbistart[0]));
	128	if (fh->vbi_fmt.fmt.count[1] > 0)
	129	skip_lines1 = max(0, (fh->vbi_fmt.fmt.start[1]
	130	- tvnorm->vbistart[1]));
	131
	132	redo_dma_risc = 0;
	133
	134	if (buf->vbi_skip[0] != skip_lines0 \|\|
	135	buf->vbi_skip[1] != skip_lines1 \|\|
	136	buf->vbi_count[0] != fh->vbi_fmt.fmt.count[0] \|\|
	137	buf->vbi_count[1] != fh->vbi_fmt.fmt.count[1]) {
	138	buf->vbi_skip[0] = skip_lines0;
	139	buf->vbi_skip[1] = skip_lines1;
	140	buf->vbi_count[0] = fh->vbi_fmt.fmt.count[0];
	141	buf->vbi_count[1] = fh->vbi_fmt.fmt.count[1];
	142	redo_dma_risc = 1;
	143	}
	144
	145	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
	146	redo_dma_risc = 1;
	147	if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
	148	goto fail;
	149	}
	150
	151	if (redo_dma_risc) {
	152	unsigned int bpl, padding, offset;
	153	struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
	154
	155	bpl = 2044; /* max. vbipack */
	156	padding = VBI_BPL - bpl;
	157
	158	if (fh->vbi_fmt.fmt.count[0] > 0) {
	159	rc = bttv_risc_packed(btv, &buf->top,
	160	dma->sglist,
	161	/* offset */ 0, bpl,
	162	padding, skip_lines0,
	163	fh->vbi_fmt.fmt.count[0]);
	164	if (0 != rc)
	165	goto fail;
	166	}
	167
	168	if (fh->vbi_fmt.fmt.count[1] > 0) {
	169	offset = fh->vbi_fmt.fmt.count[0] * VBI_BPL;
	170
	171	rc = bttv_risc_packed(btv, &buf->bottom,
	172	dma->sglist,
	173	offset, bpl,
	174	padding, skip_lines1,
	175	fh->vbi_fmt.fmt.count[1]);
	176	if (0 != rc)
	177	goto fail;
	178	}
	179	}
	180
	181	/* VBI capturing ends at VDELAY, start of video capturing,
	182	no matter where the RISC program ends. VDELAY minimum is 2,
	183	bounds.top is the corresponding first field line number
	184	times two. VDELAY counts half field lines. */
	185	min_vdelay = MIN_VDELAY;
	186	if (fh->vbi_fmt.end >= tvnorm->cropcap.bounds.top)
	187	min_vdelay += fh->vbi_fmt.end - tvnorm->cropcap.bounds.top;
	188
	189	/* For bttv_buffer_activate_vbi(). */
	190	buf->geo.vdelay = min_vdelay;
	191
	192	buf->vb.state = VIDEOBUF_PREPARED;
	193	buf->vb.field = field;
	194	dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
	195	vb, &buf->top, &buf->bottom,
	196	v4l2_field_names[buf->vb.field]);
	197	return 0;
	198
	199	fail:
	200	bttv_dma_free(q,btv,buf);
	201	return rc;
	202	}
	203
	204	static void
	205	vbi_buffer_queue(struct videobuf_queue q, struct videobuf_buffer vb)
	206	{
	207	struct bttv_fh *fh = q->priv_data;
	208	struct bttv *btv = fh->btv;
	209	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	210
	211	dprintk("queue %p\n",vb);
	212	buf->vb.state = VIDEOBUF_QUEUED;
	213	list_add_tail(&buf->vb.queue,&btv->vcapture);
	214	if (NULL == btv->cvbi) {
	215	fh->btv->loop_irq \|= 4;
	216	bttv_set_dma(btv,0x0c);
	217	}
	218	}
	219
	220	static void vbi_buffer_release(struct videobuf_queue q, struct videobuf_buffer vb)
	221	{
	222	struct bttv_fh *fh = q->priv_data;
	223	struct bttv *btv = fh->btv;
	224	struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
	225
	226	dprintk("free %p\n",vb);
	227	bttv_dma_free(q,fh->btv,buf);
	228	}
	229
	230	struct videobuf_queue_ops bttv_vbi_qops = {
	231	.buf_setup = vbi_buffer_setup,
	232	.buf_prepare = vbi_buffer_prepare,
	233	.buf_queue = vbi_buffer_queue,
	234	.buf_release = vbi_buffer_release,
	235	};
	236
	237	/* ----------------------------------------------------------------------- */
	238
	239	static int try_fmt(struct v4l2_vbi_format f, const struct bttv_tvnorm tvnorm,
	240	__s32 crop_start)
	241	{
	242	__s32 min_start, max_start, max_end, f2_offset;
	243	unsigned int i;
	244
	245	/* For compatibility with earlier driver versions we must pretend
	246	the VBI and video capture window may overlap. In reality RISC
	247	magic aborts VBI capturing at the first line of video capturing,
	248	leaving the rest of the buffer unchanged, usually all zero.
	249	VBI capturing must always start before video capturing. >> 1
	250	because cropping counts field lines times two. */
	251	min_start = tvnorm->vbistart[0];
	252	max_start = (crop_start >> 1) - 1;
	253	max_end = (tvnorm->cropcap.bounds.top
	254	+ tvnorm->cropcap.bounds.height) >> 1;
	255
	256	if (min_start > max_start)
	257	return -EBUSY;
	258
	259	BUG_ON(max_start >= max_end);
	260
	261	f->sampling_rate = tvnorm->Fsc;
	262	f->samples_per_line = VBI_BPL;
	263	f->sample_format = V4L2_PIX_FMT_GREY;
	264	f->offset = VBI_OFFSET;
	265
	266	f2_offset = tvnorm->vbistart[1] - tvnorm->vbistart[0];
	267
	268	for (i = 0; i < 2; ++i) {
	269	if (0 == f->count[i]) {
	270	/* No data from this field. We leave f->start[i]
	271	alone because VIDIOCSVBIFMT is w/o and EINVALs
	272	when a driver does not support exactly the
	273	requested parameters. */
	274	} else {
	275	s64 start, count;
	276
	277	start = clamp(f->start[i], min_start, max_start);
	278	/* s64 to prevent overflow. */
	279	count = (s64) f->start[i] + f->count[i] - start;
	280	f->start[i] = start;
	281	f->count[i] = clamp(count, (s64) 1,
	282	max_end - start);
	283	}
	284
	285	min_start += f2_offset;
	286	max_start += f2_offset;
	287	max_end += f2_offset;
	288	}
	289
	290	if (0 == (f->count[0] \| f->count[1])) {
	291	/* As in earlier driver versions. */
	292	f->start[0] = tvnorm->vbistart[0];
	293	f->start[1] = tvnorm->vbistart[1];
	294	f->count[0] = 1;
	295	f->count[1] = 1;
	296	}
	297
	298	f->flags = 0;
	299
	300	f->reserved[0] = 0;
	301	f->reserved[1] = 0;
	302
	303	return 0;
	304	}
	305
	306	int bttv_try_fmt_vbi_cap(struct file file, void f, struct v4l2_format *frt)
	307	{
	308	struct bttv_fh *fh = f;
	309	struct bttv *btv = fh->btv;
	310	const struct bttv_tvnorm *tvnorm;
	311	__s32 crop_start;
	312
	313	mutex_lock(&btv->lock);
	314
	315	tvnorm = &bttv_tvnorms[btv->tvnorm];
	316	crop_start = btv->crop_start;
	317
	318	mutex_unlock(&btv->lock);
	319
	320	return try_fmt(&frt->fmt.vbi, tvnorm, crop_start);
	321	}
	322
	323
	324	int bttv_s_fmt_vbi_cap(struct file file, void f, struct v4l2_format *frt)
	325	{
	326	struct bttv_fh *fh = f;
	327	struct bttv *btv = fh->btv;
	328	const struct bttv_tvnorm *tvnorm;
	329	__s32 start1, end;
	330	int rc;
	331
	332	mutex_lock(&btv->lock);
	333
	334	rc = -EBUSY;
	335	if (fh->resources & RESOURCE_VBI)
	336	goto fail;
	337
	338	tvnorm = &bttv_tvnorms[btv->tvnorm];
	339
	340	rc = try_fmt(&frt->fmt.vbi, tvnorm, btv->crop_start);
	341	if (0 != rc)
	342	goto fail;
	343
	344	start1 = frt->fmt.vbi.start[1] - tvnorm->vbistart[1] +
	345	tvnorm->vbistart[0];
	346
	347	/* First possible line of video capturing. Should be
	348	max(f->start[0] + f->count[0], start1 + f->count[1]) * 2
	349	when capturing both fields. But for compatibility we must
	350	pretend the VBI and video capture window may overlap,
	351	so end = start + 1, the lowest possible value, times two
	352	because vbi_fmt.end counts field lines times two. */
	353	end = max(frt->fmt.vbi.start[0], start1) * 2 + 2;
	354
	355	mutex_lock(&fh->vbi.vb_lock);
	356
	357	fh->vbi_fmt.fmt = frt->fmt.vbi;
	358	fh->vbi_fmt.tvnorm = tvnorm;
	359	fh->vbi_fmt.end = end;
	360
	361	mutex_unlock(&fh->vbi.vb_lock);
	362
	363	rc = 0;
	364
	365	fail:
	366	mutex_unlock(&btv->lock);
	367
	368	return rc;
	369	}
	370
	371
	372	int bttv_g_fmt_vbi_cap(struct file file, void f, struct v4l2_format *frt)
	373	{
	374	struct bttv_fh *fh = f;
	375	const struct bttv_tvnorm *tvnorm;
	376
	377	frt->fmt.vbi = fh->vbi_fmt.fmt;
	378
	379	tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
	380
	381	if (tvnorm != fh->vbi_fmt.tvnorm) {
	382	__s32 max_end;
	383	unsigned int i;
	384
	385	/* As in vbi_buffer_prepare() this imitates the
	386	behaviour of earlier driver versions after video
	387	standard changes, with default parameters anyway. */
	388
	389	max_end = (tvnorm->cropcap.bounds.top
	390	+ tvnorm->cropcap.bounds.height) >> 1;
	391
	392	frt->fmt.vbi.sampling_rate = tvnorm->Fsc;
	393
	394	for (i = 0; i < 2; ++i) {
	395	__s32 new_start;
	396
	397	new_start = frt->fmt.vbi.start[i]
	398	+ tvnorm->vbistart[i]
	399	- fh->vbi_fmt.tvnorm->vbistart[i];
	400
	401	frt->fmt.vbi.start[i] = min(new_start, max_end - 1);
	402	frt->fmt.vbi.count[i] =
	403	min((__s32) frt->fmt.vbi.count[i],
	404	max_end - frt->fmt.vbi.start[i]);
	405
	406	max_end += tvnorm->vbistart[1]
	407	- tvnorm->vbistart[0];
	408	}
	409	}
	410	return 0;
	411	}
	412
	413	void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, int norm)
	414	{
	415	const struct bttv_tvnorm *tvnorm;
	416	unsigned int real_samples_per_line;
	417	unsigned int real_count;
	418
	419	tvnorm = &bttv_tvnorms[norm];
	420
	421	f->fmt.sampling_rate = tvnorm->Fsc;
	422	f->fmt.samples_per_line = VBI_BPL;
	423	f->fmt.sample_format = V4L2_PIX_FMT_GREY;
	424	f->fmt.offset = VBI_OFFSET;
	425	f->fmt.start[0] = tvnorm->vbistart[0];
	426	f->fmt.start[1] = tvnorm->vbistart[1];
	427	f->fmt.count[0] = VBI_DEFLINES;
	428	f->fmt.count[1] = VBI_DEFLINES;
	429	f->fmt.flags = 0;
	430	f->fmt.reserved[0] = 0;
	431	f->fmt.reserved[1] = 0;
	432
	433	/* For compatibility the buffer size must be 2 * VBI_DEFLINES *
	434	VBI_BPL regardless of the current video standard. */
	435	real_samples_per_line = 1024 + tvnorm->vbipack * 4;
	436	real_count = ((tvnorm->cropcap.defrect.top >> 1)
	437	- tvnorm->vbistart[0]);
	438
	439	BUG_ON(real_samples_per_line > VBI_BPL);
	440	BUG_ON(real_count > VBI_DEFLINES);
	441
	442	f->tvnorm = tvnorm;
	443
	444	/* See bttv_vbi_fmt_set(). */
	445	f->end = tvnorm->vbistart[0] * 2 + 2;
	446	}
	447
	448	/* ----------------------------------------------------------------------- */
	449	/*
	450	* Local variables:
	451	* c-basic-offset: 8
	452	* End:
	453	*/