drivers/media/video/cx18/cx18-av-vbi.c - kernel/msm-4.9 - Gitiles

 /*
  *  cx18 ADEC VBI functions
  *
  *  Derived from cx25840-vbi.c
  *
  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
  *
  *  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., 51 Franklin Street, Fifth Floor, Boston, MA
  *  02110-1301, USA.
  */


 #include "cx18-driver.h"

 /*
  * For sliced VBI output, we set up to use VIP-1.1, 8-bit mode,
  * NN counts 1 byte Dwords, an IDID with the VBI line # in it.
  * Thus, according to the VIP-2 Spec, our VBI ancillary data lines
  * (should!) look like:
  *	4 byte EAV code:          0xff 0x00 0x00 0xRP
  *	unknown number of possible idle bytes
  *	3 byte Anc data preamble: 0x00 0xff 0xff
  *	1 byte data identifier:   ne010iii (parity bits, 010, DID bits)
  *	1 byte secondary data id: nessssss (parity bits, SDID bits)
  *	1 byte data word count:   necccccc (parity bits, NN Dword count)
  *	2 byte Internal DID:	  VBI-line-# 0x80
  *	NN data bytes
  *	1 byte checksum
  *	Fill bytes needed to fil out to 4*NN bytes of payload
  *
  * The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, &
  * in the vertical blanking interval are:
  *	0xb0 (Task         0 VerticalBlank HorizontalBlank 0 0 0 0)
  *	0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0)
  *
  * Since the V bit is only allowed to toggle in the EAV RP code, just
  * before the first active region line and for active lines, they are:
  *	0x90 (Task         0 0 HorizontalBlank 0 0 0 0)
  *	0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0)
  *
  * The user application DID bytes we care about are:
  *	0x91 (1 0 010        0 !ActiveLine AncDataPresent)
  *	0x55 (0 1 010 2ndField !ActiveLine AncDataPresent)
  *
  */
 static const u8 sliced_vbi_did[2] = { 0x91, 0x55 };

 struct vbi_anc_data {
 	/* u8 eav[4]; */
 	/* u8 idle[]; Variable number of idle bytes */
 	u8 preamble[3];
 	u8 did;
 	u8 sdid;
 	u8 data_count;
 	u8 idid[2];
 	u8 payload[1]; /* data_count of payload */
 	/* u8 checksum; */
 	/* u8 fill[]; Variable number of fill bytes */
 };

 static int odd_parity(u8 c)
 {
 	c ^= (c >> 4);
 	c ^= (c >> 2);
 	c ^= (c >> 1);

 	return c & 1;
 }

 static int decode_vps(u8 *dst, u8 *p)
 {
 	static const u8 biphase_tbl[] = {
 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
 		0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
 		0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
 		0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
 		0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
 		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
 		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
 		0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
 		0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
 		0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
 		0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
 		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
 		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
 		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
 		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
 		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
 		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
 		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
 		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
 	};

 	u8 c, err = 0;
 	int i;

 	for (i = 0; i < 2 * 13; i += 2) {
 		err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
 		c = (biphase_tbl[p[i + 1]] & 0xf) |
 		    ((biphase_tbl[p[i]] & 0xf) << 4);
 		dst[i / 2] = c;
 	}

 	return err & 0xf0;
 }

 int cx18_av_vbi_g_fmt(struct cx18 *cx, struct v4l2_format *fmt)
 {
 	struct cx18_av_state *state = &cx->av_state;
 	struct v4l2_sliced_vbi_format *svbi;
 	static const u16 lcr2vbi[] = {
 		0, V4L2_SLICED_TELETEXT_B, 0,	/* 1 */
 		0, V4L2_SLICED_WSS_625, 0,	/* 4 */
 		V4L2_SLICED_CAPTION_525,	/* 6 */
 		0, 0, V4L2_SLICED_VPS, 0, 0,	/* 9 */
 		0, 0, 0, 0
 	};
 	int is_pal = !(state->std & V4L2_STD_525_60);
 	int i;

 	if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
 		return -EINVAL;
 	svbi = &fmt->fmt.sliced;
 	memset(svbi, 0, sizeof(*svbi));
 	/* we're done if raw VBI is active */
 	if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
 		return 0;

 	if (is_pal) {
 		for (i = 7; i <= 23; i++) {
 			u8 v = cx18_av_read(cx, 0x424 + i - 7);

 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 			svbi->service_set |= svbi->service_lines[0][i] |
 				svbi->service_lines[1][i];
 		}
 	} else {
 		for (i = 10; i <= 21; i++) {
 			u8 v = cx18_av_read(cx, 0x424 + i - 10);

 			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
 			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
 			svbi->service_set |= svbi->service_lines[0][i] |
 				svbi->service_lines[1][i];
 		}
 	}
 	return 0;
 }

 int cx18_av_vbi_s_fmt(struct cx18 *cx, struct v4l2_format *fmt)
 {
 	struct cx18_av_state *state = &cx->av_state;
 	struct v4l2_sliced_vbi_format *svbi;
 	int is_pal = !(state->std & V4L2_STD_525_60);
 	int i, x;
 	u8 lcr[24];

 	if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
 			fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
 		return -EINVAL;
 	svbi = &fmt->fmt.sliced;
 	if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 		/* raw VBI */
 		memset(svbi, 0, sizeof(*svbi));

 		/* Setup standard */
 		cx18_av_std_setup(cx);

 		/* VBI Offset */
 		cx18_av_write(cx, 0x47f, state->slicer_line_delay);
 		cx18_av_write(cx, 0x404, 0x2e);
 		return 0;
 	}

 	for (x = 0; x <= 23; x++)
 		lcr[x] = 0x00;

 	/* Setup standard */
 	cx18_av_std_setup(cx);

 	/* Sliced VBI */
 	cx18_av_write(cx, 0x404, 0x32);	/* Ancillary data */
 	cx18_av_write(cx, 0x406, 0x13);
 	cx18_av_write(cx, 0x47f, state->slicer_line_delay);

 	/* Force impossible lines to 0 */
 	if (is_pal) {
 		for (i = 0; i <= 6; i++)
 			svbi->service_lines[0][i] =
 				svbi->service_lines[1][i] = 0;
 	} else {
 		for (i = 0; i <= 9; i++)
 			svbi->service_lines[0][i] =
 				svbi->service_lines[1][i] = 0;

 		for (i = 22; i <= 23; i++)
 			svbi->service_lines[0][i] =
 				svbi->service_lines[1][i] = 0;
 	}

 	/* Build register values for requested service lines */
 	for (i = 7; i <= 23; i++) {
 		for (x = 0; x <= 1; x++) {
 			switch (svbi->service_lines[1-x][i]) {
 			case V4L2_SLICED_TELETEXT_B:
 				lcr[i] |= 1 << (4 * x);
 				break;
 			case V4L2_SLICED_WSS_625:
 				lcr[i] |= 4 << (4 * x);
 				break;
 			case V4L2_SLICED_CAPTION_525:
 				lcr[i] |= 6 << (4 * x);
 				break;
 			case V4L2_SLICED_VPS:
 				lcr[i] |= 9 << (4 * x);
 				break;
 			}
 		}
 	}

 	if (is_pal) {
 		for (x = 1, i = 0x424; i <= 0x434; i++, x++)
 			cx18_av_write(cx, i, lcr[6 + x]);
 	} else {
 		for (x = 1, i = 0x424; i <= 0x430; i++, x++)
 			cx18_av_write(cx, i, lcr[9 + x]);
 		for (i = 0x431; i <= 0x434; i++)
 			cx18_av_write(cx, i, 0);
 	}

 	cx18_av_write(cx, 0x43c, 0x16);
 	/* FIXME - should match vblank set in cx18_av_std_setup() */
 	cx18_av_write(cx, 0x474, is_pal ? 0x2a : 26);
 	return 0;
 }

 int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
 				   struct v4l2_decode_vbi_line *vbi)
 {
 	struct cx18 *cx = v4l2_get_subdevdata(sd);
 	struct cx18_av_state *state = &cx->av_state;
 	struct vbi_anc_data *anc = (struct vbi_anc_data *)vbi->p;
 	u8 *p;
 	int did, sdid, l, err = 0;

 	/*
 	 * Check for the ancillary data header for sliced VBI
 	 */
 	if (anc->preamble[0] ||
 			anc->preamble[1] != 0xff || anc->preamble[2] != 0xff ||
 			(anc->did != sliced_vbi_did[0] &&
 			 anc->did != sliced_vbi_did[1])) {
 		vbi->line = vbi->type = 0;
 		return 0;
 	}

 	did = anc->did;
 	sdid = anc->sdid & 0xf;
 	l = anc->idid[0] & 0x3f;
 	l += state->slicer_line_offset;
 	p = anc->payload;

 	/* Decode the SDID set by the slicer */
 	switch (sdid) {
 	case 1:
 		sdid = V4L2_SLICED_TELETEXT_B;
 		break;
 	case 4:
 		sdid = V4L2_SLICED_WSS_625;
 		break;
 	case 6:
 		sdid = V4L2_SLICED_CAPTION_525;
 		err = !odd_parity(p[0]) || !odd_parity(p[1]);
 		break;
 	case 9:
 		sdid = V4L2_SLICED_VPS;
 		if (decode_vps(p, p) != 0)
 			err = 1;
 		break;
 	default:
 		sdid = 0;
 		err = 1;
 		break;
 	}

 	vbi->type = err ? 0 : sdid;
 	vbi->line = err ? 0 : l;
 	vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]);
 	vbi->p = p;
 	return 0;
 }
	/*
	* cx18 ADEC VBI functions
	*
	* Derived from cx25840-vbi.c
	*
	* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
	*
	* 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., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/


	#include "cx18-driver.h"

	/*
	* For sliced VBI output, we set up to use VIP-1.1, 8-bit mode,
	* NN counts 1 byte Dwords, an IDID with the VBI line # in it.
	* Thus, according to the VIP-2 Spec, our VBI ancillary data lines
	* (should!) look like:
	* 4 byte EAV code: 0xff 0x00 0x00 0xRP
	* unknown number of possible idle bytes
	* 3 byte Anc data preamble: 0x00 0xff 0xff
	* 1 byte data identifier: ne010iii (parity bits, 010, DID bits)
	* 1 byte secondary data id: nessssss (parity bits, SDID bits)
	* 1 byte data word count: necccccc (parity bits, NN Dword count)
	* 2 byte Internal DID: VBI-line-# 0x80
	* NN data bytes
	* 1 byte checksum
	* Fill bytes needed to fil out to 4*NN bytes of payload
	*
	* The RP codes for EAVs when in VIP-1.1 mode, not in raw mode, &
	* in the vertical blanking interval are:
	* 0xb0 (Task 0 VerticalBlank HorizontalBlank 0 0 0 0)
	* 0xf0 (Task EvenField VerticalBlank HorizontalBlank 0 0 0 0)
	*
	* Since the V bit is only allowed to toggle in the EAV RP code, just
	* before the first active region line and for active lines, they are:
	* 0x90 (Task 0 0 HorizontalBlank 0 0 0 0)
	* 0xd0 (Task EvenField 0 HorizontalBlank 0 0 0 0)
	*
	* The user application DID bytes we care about are:
	* 0x91 (1 0 010 0 !ActiveLine AncDataPresent)
	* 0x55 (0 1 010 2ndField !ActiveLine AncDataPresent)
	*
	*/
	static const u8 sliced_vbi_did[2] = { 0x91, 0x55 };

	struct vbi_anc_data {
	/* u8 eav[4]; */
	/* u8 idle[]; Variable number of idle bytes */
	u8 preamble[3];
	u8 did;
	u8 sdid;
	u8 data_count;
	u8 idid[2];
	u8 payload[1]; /* data_count of payload */
	/* u8 checksum; */
	/* u8 fill[]; Variable number of fill bytes */
	};

	static int odd_parity(u8 c)
	{
	c ^= (c >> 4);
	c ^= (c >> 2);
	c ^= (c >> 1);

	return c & 1;
	}

	static int decode_vps(u8 dst, u8 p)
	{
	static const u8 biphase_tbl[] = {
	0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
	0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
	0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
	0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
	0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
	0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
	0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
	0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
	0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
	0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
	0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
	0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
	0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
	0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
	0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
	0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
	0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
	0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
	0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
	0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
	0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
	0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
	0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
	0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
	0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
	0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
	0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
	0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
	0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
	0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
	0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
	0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
	};

	u8 c, err = 0;
	int i;

	for (i = 0; i < 2 * 13; i += 2) {
	err \|= biphase_tbl[p[i]] \| biphase_tbl[p[i + 1]];
	c = (biphase_tbl[p[i + 1]] & 0xf) \|
	((biphase_tbl[p[i]] & 0xf) << 4);
	dst[i / 2] = c;
	}

	return err & 0xf0;
	}

	int cx18_av_vbi_g_fmt(struct cx18 cx, struct v4l2_format fmt)
	{
	struct cx18_av_state *state = &cx->av_state;
	struct v4l2_sliced_vbi_format *svbi;
	static const u16 lcr2vbi[] = {
	0, V4L2_SLICED_TELETEXT_B, 0, /* 1 */
	0, V4L2_SLICED_WSS_625, 0, /* 4 */
	V4L2_SLICED_CAPTION_525, /* 6 */
	0, 0, V4L2_SLICED_VPS, 0, 0, /* 9 */
	0, 0, 0, 0
	};
	int is_pal = !(state->std & V4L2_STD_525_60);
	int i;

	if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
	return -EINVAL;
	svbi = &fmt->fmt.sliced;
	memset(svbi, 0, sizeof(*svbi));
	/* we're done if raw VBI is active */
	if ((cx18_av_read(cx, 0x404) & 0x10) == 0)
	return 0;

	if (is_pal) {
	for (i = 7; i <= 23; i++) {
	u8 v = cx18_av_read(cx, 0x424 + i - 7);

	svbi->service_lines[0][i] = lcr2vbi[v >> 4];
	svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
	svbi->service_set \|= svbi->service_lines[0][i] \|
	svbi->service_lines[1][i];
	}
	} else {
	for (i = 10; i <= 21; i++) {
	u8 v = cx18_av_read(cx, 0x424 + i - 10);

	svbi->service_lines[0][i] = lcr2vbi[v >> 4];
	svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
	svbi->service_set \|= svbi->service_lines[0][i] \|
	svbi->service_lines[1][i];
	}
	}
	return 0;
	}

	int cx18_av_vbi_s_fmt(struct cx18 cx, struct v4l2_format fmt)
	{
	struct cx18_av_state *state = &cx->av_state;
	struct v4l2_sliced_vbi_format *svbi;
	int is_pal = !(state->std & V4L2_STD_525_60);
	int i, x;
	u8 lcr[24];

	if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE &&
	fmt->type != V4L2_BUF_TYPE_VBI_CAPTURE)
	return -EINVAL;
	svbi = &fmt->fmt.sliced;
	if (fmt->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
	/* raw VBI */
	memset(svbi, 0, sizeof(*svbi));

	/* Setup standard */
	cx18_av_std_setup(cx);

	/* VBI Offset */
	cx18_av_write(cx, 0x47f, state->slicer_line_delay);
	cx18_av_write(cx, 0x404, 0x2e);
	return 0;
	}

	for (x = 0; x <= 23; x++)
	lcr[x] = 0x00;

	/* Setup standard */
	cx18_av_std_setup(cx);

	/* Sliced VBI */
	cx18_av_write(cx, 0x404, 0x32); /* Ancillary data */
	cx18_av_write(cx, 0x406, 0x13);
	cx18_av_write(cx, 0x47f, state->slicer_line_delay);

	/* Force impossible lines to 0 */
	if (is_pal) {
	for (i = 0; i <= 6; i++)
	svbi->service_lines[0][i] =
	svbi->service_lines[1][i] = 0;
	} else {
	for (i = 0; i <= 9; i++)
	svbi->service_lines[0][i] =
	svbi->service_lines[1][i] = 0;

	for (i = 22; i <= 23; i++)
	svbi->service_lines[0][i] =
	svbi->service_lines[1][i] = 0;
	}

	/* Build register values for requested service lines */
	for (i = 7; i <= 23; i++) {
	for (x = 0; x <= 1; x++) {
	switch (svbi->service_lines[1-x][i]) {
	case V4L2_SLICED_TELETEXT_B:
	lcr[i] \|= 1 << (4 * x);
	break;
	case V4L2_SLICED_WSS_625:
	lcr[i] \|= 4 << (4 * x);
	break;
	case V4L2_SLICED_CAPTION_525:
	lcr[i] \|= 6 << (4 * x);
	break;
	case V4L2_SLICED_VPS:
	lcr[i] \|= 9 << (4 * x);
	break;
	}
	}
	}

	if (is_pal) {
	for (x = 1, i = 0x424; i <= 0x434; i++, x++)
	cx18_av_write(cx, i, lcr[6 + x]);
	} else {
	for (x = 1, i = 0x424; i <= 0x430; i++, x++)
	cx18_av_write(cx, i, lcr[9 + x]);
	for (i = 0x431; i <= 0x434; i++)
	cx18_av_write(cx, i, 0);
	}

	cx18_av_write(cx, 0x43c, 0x16);
	/* FIXME - should match vblank set in cx18_av_std_setup() */
	cx18_av_write(cx, 0x474, is_pal ? 0x2a : 26);
	return 0;
	}

	int cx18_av_decode_vbi_line(struct v4l2_subdev *sd,
	struct v4l2_decode_vbi_line *vbi)
	{
	struct cx18 *cx = v4l2_get_subdevdata(sd);
	struct cx18_av_state *state = &cx->av_state;
	struct vbi_anc_data anc = (struct vbi_anc_data )vbi->p;
	u8 *p;
	int did, sdid, l, err = 0;

	/*
	* Check for the ancillary data header for sliced VBI
	*/
	if (anc->preamble[0] \|\|
	anc->preamble[1] != 0xff \|\| anc->preamble[2] != 0xff \|\|
	(anc->did != sliced_vbi_did[0] &&
	anc->did != sliced_vbi_did[1])) {
	vbi->line = vbi->type = 0;
	return 0;
	}

	did = anc->did;
	sdid = anc->sdid & 0xf;
	l = anc->idid[0] & 0x3f;
	l += state->slicer_line_offset;
	p = anc->payload;

	/* Decode the SDID set by the slicer */
	switch (sdid) {
	case 1:
	sdid = V4L2_SLICED_TELETEXT_B;
	break;
	case 4:
	sdid = V4L2_SLICED_WSS_625;
	break;
	case 6:
	sdid = V4L2_SLICED_CAPTION_525;
	err = !odd_parity(p[0]) \|\| !odd_parity(p[1]);
	break;
	case 9:
	sdid = V4L2_SLICED_VPS;
	if (decode_vps(p, p) != 0)
	err = 1;
	break;
	default:
	sdid = 0;
	err = 1;
	break;
	}

	vbi->type = err ? 0 : sdid;
	vbi->line = err ? 0 : l;
	vbi->is_second_field = err ? 0 : (did == sliced_vbi_did[1]);
	vbi->p = p;
	return 0;
	}