linux/drivers/media/pci/bt8xx/bttv-vbi.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*

    bttv - Bt848 frame grabber driver
    vbi interface

    (c) 2002 Gerd Knorr <[email protected]>

    Copyright (C) 2005, 2006 Michael H. Schimek <[email protected]>
    Sponsored by OPQ Systems AB

*/

#define pr_fmt(fmt) …

#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 <media/v4l2-ioctl.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 …

static unsigned int vbibufs = …;
static unsigned int vbi_debug;

module_param(vbibufs,   int, 0444);
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(…) …;
MODULE_PARM_DESC(…) …;

#ifdef dprintk
# undef dprintk
#endif
#define dprintk(fmt, ...) …

#define IMAGE_SIZE(fmt) …

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

static int queue_setup_vbi(struct vb2_queue *q, unsigned int *num_buffers,
			   unsigned int *num_planes, unsigned int sizes[],
			   struct device *alloc_devs[])
{ … }

static void buf_queue_vbi(struct vb2_buffer *vb)
{ … }

static int buf_prepare_vbi(struct vb2_buffer *vb)
{ … }

static void buf_cleanup_vbi(struct vb2_buffer *vb)
{ … }

static int start_streaming_vbi(struct vb2_queue *q, unsigned int count)
{ … }

static void stop_streaming_vbi(struct vb2_queue *q)
{ … }

const struct vb2_ops bttv_vbi_qops = …;

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

static int try_fmt(struct v4l2_vbi_format *f, const struct bttv_tvnorm *tvnorm,
			__s32 crop_start)
{ … }

int bttv_try_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{ … }


int bttv_s_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{ … }


int bttv_g_fmt_vbi_cap(struct file *file, void *f, struct v4l2_format *frt)
{ … }

void bttv_vbi_fmt_reset(struct bttv_vbi_fmt *f, unsigned int norm)
{ … }