drivers/media/pci/ivtv/ivtv-vbi.c - kernel/lockdown - Git at Google

 /*
     Vertical Blank Interval support functions
     Copyright (C) 2004-2007  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 #include "ivtv-driver.h"
 #include "ivtv-i2c.h"
 #include "ivtv-ioctl.h"
 #include "ivtv-queue.h"
 #include "ivtv-cards.h"
 #include "ivtv-vbi.h"

 static void ivtv_set_vps(struct ivtv *itv, int enabled)
 {
 	struct v4l2_sliced_vbi_data data;

 	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
 		return;
 	data.id = V4L2_SLICED_VPS;
 	data.field = 0;
 	data.line = enabled ? 16 : 0;
 	data.data[2] = itv->vbi.vps_payload.data[0];
 	data.data[8] = itv->vbi.vps_payload.data[1];
 	data.data[9] = itv->vbi.vps_payload.data[2];
 	data.data[10] = itv->vbi.vps_payload.data[3];
 	data.data[11] = itv->vbi.vps_payload.data[4];
 	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
 }

 static void ivtv_set_cc(struct ivtv *itv, int mode, const struct vbi_cc *cc)
 {
 	struct v4l2_sliced_vbi_data data;

 	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
 		return;
 	data.id = V4L2_SLICED_CAPTION_525;
 	data.field = 0;
 	data.line = (mode & 1) ? 21 : 0;
 	data.data[0] = cc->odd[0];
 	data.data[1] = cc->odd[1];
 	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
 	data.field = 1;
 	data.line = (mode & 2) ? 21 : 0;
 	data.data[0] = cc->even[0];
 	data.data[1] = cc->even[1];
 	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
 }

 static void ivtv_set_wss(struct ivtv *itv, int enabled, int mode)
 {
 	struct v4l2_sliced_vbi_data data;

 	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
 		return;
 	/* When using a 50 Hz system, always turn on the
 	   wide screen signal with 4x3 ratio as the default.
 	   Turning this signal on and off can confuse certain
 	   TVs. As far as I can tell there is no reason not to
 	   transmit this signal. */
 	if ((itv->std_out & V4L2_STD_625_50) && !enabled) {
 		enabled = 1;
 		mode = 0x08;  /* 4x3 full format */
 	}
 	data.id = V4L2_SLICED_WSS_625;
 	data.field = 0;
 	data.line = enabled ? 23 : 0;
 	data.data[0] = mode & 0xff;
 	data.data[1] = (mode >> 8) & 0xff;
 	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
 }

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

 	return c & 1;
 }

 static void ivtv_write_vbi_line(struct ivtv *itv,
 				const struct v4l2_sliced_vbi_data *d,
 				struct vbi_cc *cc, int *found_cc)
 {
 	struct vbi_info *vi = &itv->vbi;

 	if (d->id == V4L2_SLICED_CAPTION_525 && d->line == 21) {
 		if (d->field) {
 			cc->even[0] = d->data[0];
 			cc->even[1] = d->data[1];
 		} else {
 			cc->odd[0] = d->data[0];
 			cc->odd[1] = d->data[1];
 		}
 		*found_cc = 1;
 	} else if (d->id == V4L2_SLICED_VPS && d->line == 16 && d->field == 0) {
 		struct vbi_vps vps;

 		vps.data[0] = d->data[2];
 		vps.data[1] = d->data[8];
 		vps.data[2] = d->data[9];
 		vps.data[3] = d->data[10];
 		vps.data[4] = d->data[11];
 		if (memcmp(&vps, &vi->vps_payload, sizeof(vps))) {
 			vi->vps_payload = vps;
 			set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
 		}
 	} else if (d->id == V4L2_SLICED_WSS_625 &&
 		   d->line == 23 && d->field == 0) {
 		int wss = d->data[0] | d->data[1] << 8;

 		if (vi->wss_payload != wss) {
 			vi->wss_payload = wss;
 			set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
 		}
 	}
 }

 static void ivtv_write_vbi_cc_lines(struct ivtv *itv, const struct vbi_cc *cc)
 {
 	struct vbi_info *vi = &itv->vbi;

 	if (vi->cc_payload_idx < ARRAY_SIZE(vi->cc_payload)) {
 		memcpy(&vi->cc_payload[vi->cc_payload_idx], cc,
 		       sizeof(struct vbi_cc));
 		vi->cc_payload_idx++;
 		set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
 	}
 }

 static void ivtv_write_vbi(struct ivtv *itv,
 			   const struct v4l2_sliced_vbi_data *sliced,
 			   size_t cnt)
 {
 	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
 	int found_cc = 0;
 	size_t i;

 	for (i = 0; i < cnt; i++)
 		ivtv_write_vbi_line(itv, sliced + i, &cc, &found_cc);

 	if (found_cc)
 		ivtv_write_vbi_cc_lines(itv, &cc);
 }

 ssize_t
 ivtv_write_vbi_from_user(struct ivtv *itv,
 			 const struct v4l2_sliced_vbi_data __user *sliced,
 			 size_t cnt)
 {
 	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
 	int found_cc = 0;
 	size_t i;
 	struct v4l2_sliced_vbi_data d;
 	ssize_t ret = cnt * sizeof(struct v4l2_sliced_vbi_data);

 	for (i = 0; i < cnt; i++) {
 		if (copy_from_user(&d, sliced + i,
 				   sizeof(struct v4l2_sliced_vbi_data))) {
 			ret = -EFAULT;
 			break;
 		}
 		ivtv_write_vbi_line(itv, &d, &cc, &found_cc);
 	}

 	if (found_cc)
 		ivtv_write_vbi_cc_lines(itv, &cc);

 	return ret;
 }

 static void copy_vbi_data(struct ivtv *itv, int lines, u32 pts_stamp)
 {
 	int line = 0;
 	int i;
 	u32 linemask[2] = { 0, 0 };
 	unsigned short size;
 	static const u8 mpeg_hdr_data[] = {
 		0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x0c, 0x66,
 		0x24, 0x01, 0x01, 0xd1, 0xd3, 0xfa, 0xff, 0xff,
 		0x00, 0x00, 0x01, 0xbd, 0x00, 0x1a, 0x84, 0x80,
 		0x07, 0x21, 0x00, 0x5d, 0x63, 0xa7, 0xff, 0xff
 	};
 	const int sd = sizeof(mpeg_hdr_data);	/* start of vbi data */
 	int idx = itv->vbi.frame % IVTV_VBI_FRAMES;
 	u8 *dst = &itv->vbi.sliced_mpeg_data[idx][0];

 	for (i = 0; i < lines; i++) {
 		int f, l;

 		if (itv->vbi.sliced_data[i].id == 0)
 			continue;

 		l = itv->vbi.sliced_data[i].line - 6;
 		f = itv->vbi.sliced_data[i].field;
 		if (f)
 			l += 18;
 		if (l < 32)
 			linemask[0] |= (1 << l);
 		else
 			linemask[1] |= (1 << (l - 32));
 		dst[sd + 12 + line * 43] =
 			ivtv_service2vbi(itv->vbi.sliced_data[i].id);
 		memcpy(dst + sd + 12 + line * 43 + 1, itv->vbi.sliced_data[i].data, 42);
 		line++;
 	}
 	memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
 	if (line == 36) {
 		/* All lines are used, so there is no space for the linemask
 		   (the max size of the VBI data is 36 * 43 + 4 bytes).
 		   So in this case we use the magic number 'ITV0'. */
 		memcpy(dst + sd, "ITV0", 4);
 		memmove(dst + sd + 4, dst + sd + 12, line * 43);
 		size = 4 + ((43 * line + 3) & ~3);
 	} else {
 		memcpy(dst + sd, "itv0", 4);
 		cpu_to_le32s(&linemask[0]);
 		cpu_to_le32s(&linemask[1]);
 		memcpy(dst + sd + 4, &linemask[0], 8);
 		size = 12 + ((43 * line + 3) & ~3);
 	}
 	dst[4+16] = (size + 10) >> 8;
 	dst[5+16] = (size + 10) & 0xff;
 	dst[9+16] = 0x21 | ((pts_stamp >> 29) & 0x6);
 	dst[10+16] = (pts_stamp >> 22) & 0xff;
 	dst[11+16] = 1 | ((pts_stamp >> 14) & 0xff);
 	dst[12+16] = (pts_stamp >> 7) & 0xff;
 	dst[13+16] = 1 | ((pts_stamp & 0x7f) << 1);
 	itv->vbi.sliced_mpeg_size[idx] = sd + size;
 }

 static int ivtv_convert_ivtv_vbi(struct ivtv *itv, u8 *p)
 {
 	u32 linemask[2];
 	int i, l, id2;
 	int line = 0;

 	if (!memcmp(p, "itv0", 4)) {
 		memcpy(linemask, p + 4, 8);
 		p += 12;
 	} else if (!memcmp(p, "ITV0", 4)) {
 		linemask[0] = 0xffffffff;
 		linemask[1] = 0xf;
 		p += 4;
 	} else {
 		/* unknown VBI data, convert to empty VBI frame */
 		linemask[0] = linemask[1] = 0;
 	}
 	for (i = 0; i < 36; i++) {
 		int err = 0;

 		if (i < 32 && !(linemask[0] & (1 << i)))
 			continue;
 		if (i >= 32 && !(linemask[1] & (1 << (i - 32))))
 			continue;
 		id2 = *p & 0xf;
 		switch (id2) {
 		case IVTV_SLICED_TYPE_TELETEXT_B:
 			id2 = V4L2_SLICED_TELETEXT_B;
 			break;
 		case IVTV_SLICED_TYPE_CAPTION_525:
 			id2 = V4L2_SLICED_CAPTION_525;
 			err = !odd_parity(p[1]) || !odd_parity(p[2]);
 			break;
 		case IVTV_SLICED_TYPE_VPS:
 			id2 = V4L2_SLICED_VPS;
 			break;
 		case IVTV_SLICED_TYPE_WSS_625:
 			id2 = V4L2_SLICED_WSS_625;
 			break;
 		default:
 			id2 = 0;
 			break;
 		}
 		if (err == 0) {
 			l = (i < 18) ? i + 6 : i - 18 + 6;
 			itv->vbi.sliced_dec_data[line].line = l;
 			itv->vbi.sliced_dec_data[line].field = i >= 18;
 			itv->vbi.sliced_dec_data[line].id = id2;
 			memcpy(itv->vbi.sliced_dec_data[line].data, p + 1, 42);
 			line++;
 		}
 		p += 43;
 	}
 	while (line < 36) {
 		itv->vbi.sliced_dec_data[line].id = 0;
 		itv->vbi.sliced_dec_data[line].line = 0;
 		itv->vbi.sliced_dec_data[line].field = 0;
 		line++;
 	}
 	return line * sizeof(itv->vbi.sliced_dec_data[0]);
 }

 /* Compress raw VBI format, removes leading SAV codes and surplus space after the
    field.
    Returns new compressed size. */
 static u32 compress_raw_buf(struct ivtv *itv, u8 *buf, u32 size)
 {
 	u32 line_size = itv->vbi.raw_decoder_line_size;
 	u32 lines = itv->vbi.count;
 	u8 sav1 = itv->vbi.raw_decoder_sav_odd_field;
 	u8 sav2 = itv->vbi.raw_decoder_sav_even_field;
 	u8 *q = buf;
 	u8 *p;
 	int i;

 	for (i = 0; i < lines; i++) {
 		p = buf + i * line_size;

 		/* Look for SAV code */
 		if (p[0] != 0xff || p[1] || p[2] || (p[3] != sav1 && p[3] != sav2)) {
 			break;
 		}
 		memcpy(q, p + 4, line_size - 4);
 		q += line_size - 4;
 	}
 	return lines * (line_size - 4);
 }


 /* Compressed VBI format, all found sliced blocks put next to one another
    Returns new compressed size */
 static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8 sav)
 {
 	u32 line_size = itv->vbi.sliced_decoder_line_size;
 	struct v4l2_decode_vbi_line vbi;
 	int i;
 	unsigned lines = 0;

 	/* find the first valid line */
 	for (i = 0; i < size; i++, buf++) {
 		if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == sav)
 			break;
 	}

 	size -= i;
 	if (size < line_size) {
 		return line;
 	}
 	for (i = 0; i < size / line_size; i++) {
 		u8 *p = buf + i * line_size;

 		/* Look for SAV code  */
 		if (p[0] != 0xff || p[1] || p[2] || p[3] != sav) {
 			continue;
 		}
 		vbi.p = p + 4;
 		v4l2_subdev_call(itv->sd_video, vbi, decode_vbi_line, &vbi);
 		if (vbi.type && !(lines & (1 << vbi.line))) {
 			lines |= 1 << vbi.line;
 			itv->vbi.sliced_data[line].id = vbi.type;
 			itv->vbi.sliced_data[line].field = vbi.is_second_field;
 			itv->vbi.sliced_data[line].line = vbi.line;
 			memcpy(itv->vbi.sliced_data[line].data, vbi.p, 42);
 			line++;
 		}
 	}
 	return line;
 }

 void ivtv_process_vbi_data(struct ivtv *itv, struct ivtv_buffer *buf,
 			   u64 pts_stamp, int streamtype)
 {
 	u8 *p = (u8 *) buf->buf;
 	u32 size = buf->bytesused;
 	int y;

 	/* Raw VBI data */
 	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI && ivtv_raw_vbi(itv)) {
 		u8 type;

 		ivtv_buf_swap(buf);

 		type = p[3];

 		size = buf->bytesused = compress_raw_buf(itv, p, size);

 		/* second field of the frame? */
 		if (type == itv->vbi.raw_decoder_sav_even_field) {
 			/* Dirty hack needed for backwards
 			   compatibility of old VBI software. */
 			p += size - 4;
 			memcpy(p, &itv->vbi.frame, 4);
 			itv->vbi.frame++;
 		}
 		return;
 	}

 	/* Sliced VBI data with data insertion */
 	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI) {
 		int lines;

 		ivtv_buf_swap(buf);

 		/* first field */
 		lines = compress_sliced_buf(itv, 0, p, size / 2,
 			itv->vbi.sliced_decoder_sav_odd_field);
 		/* second field */
 		/* experimentation shows that the second half does not always begin
 		   at the exact address. So start a bit earlier (hence 32). */
 		lines = compress_sliced_buf(itv, lines, p + size / 2 - 32, size / 2 + 32,
 			itv->vbi.sliced_decoder_sav_even_field);
 		/* always return at least one empty line */
 		if (lines == 0) {
 			itv->vbi.sliced_data[0].id = 0;
 			itv->vbi.sliced_data[0].line = 0;
 			itv->vbi.sliced_data[0].field = 0;
 			lines = 1;
 		}
 		buf->bytesused = size = lines * sizeof(itv->vbi.sliced_data[0]);
 		memcpy(p, &itv->vbi.sliced_data[0], size);

 		if (itv->vbi.insert_mpeg) {
 			copy_vbi_data(itv, lines, pts_stamp);
 		}
 		itv->vbi.frame++;
 		return;
 	}

 	/* Sliced VBI re-inserted from an MPEG stream */
 	if (streamtype == IVTV_DEC_STREAM_TYPE_VBI) {
 		/* If the size is not 4-byte aligned, then the starting address
 		   for the swapping is also shifted. After swapping the data the
 		   real start address of the VBI data is exactly 4 bytes after the
 		   original start. It's a bit fiddly but it works like a charm.
 		   Non-4-byte alignment happens when an lseek is done on the input
 		   mpeg file to a non-4-byte aligned position. So on arrival here
 		   the VBI data is also non-4-byte aligned. */
 		int offset = size & 3;
 		int cnt;

 		if (offset) {
 			p += 4 - offset;
 		}
 		/* Swap Buffer */
 		for (y = 0; y < size; y += 4) {
 		       swab32s((u32 *)(p + y));
 		}

 		cnt = ivtv_convert_ivtv_vbi(itv, p + offset);
 		memcpy(buf->buf, itv->vbi.sliced_dec_data, cnt);
 		buf->bytesused = cnt;

 		ivtv_write_vbi(itv, itv->vbi.sliced_dec_data,
 			       cnt / sizeof(itv->vbi.sliced_dec_data[0]));
 		return;
 	}
 }

 void ivtv_disable_cc(struct ivtv *itv)
 {
 	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

 	clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
 	ivtv_set_cc(itv, 0, &cc);
 	itv->vbi.cc_payload_idx = 0;
 }


 void ivtv_vbi_work_handler(struct ivtv *itv)
 {
 	struct vbi_info *vi = &itv->vbi;
 	struct v4l2_sliced_vbi_data data;
 	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

 	/* Lock */
 	if (itv->output_mode == OUT_PASSTHROUGH) {
 		if (itv->is_50hz) {
 			data.id = V4L2_SLICED_WSS_625;
 			data.field = 0;

 			if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
 				ivtv_set_wss(itv, 1, data.data[0] & 0xf);
 				vi->wss_missing_cnt = 0;
 			} else if (vi->wss_missing_cnt == 4) {
 				ivtv_set_wss(itv, 1, 0x8);  /* 4x3 full format */
 			} else {
 				vi->wss_missing_cnt++;
 			}
 		}
 		else {
 			int mode = 0;

 			data.id = V4L2_SLICED_CAPTION_525;
 			data.field = 0;
 			if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
 				mode |= 1;
 				cc.odd[0] = data.data[0];
 				cc.odd[1] = data.data[1];
 			}
 			data.field = 1;
 			if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
 				mode |= 2;
 				cc.even[0] = data.data[0];
 				cc.even[1] = data.data[1];
 			}
 			if (mode) {
 				vi->cc_missing_cnt = 0;
 				ivtv_set_cc(itv, mode, &cc);
 			} else if (vi->cc_missing_cnt == 4) {
 				ivtv_set_cc(itv, 0, &cc);
 			} else {
 				vi->cc_missing_cnt++;
 			}
 		}
 		return;
 	}

 	if (test_and_clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags)) {
 		ivtv_set_wss(itv, 1, vi->wss_payload & 0xf);
 	}

 	if (test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags)) {
 		if (vi->cc_payload_idx == 0) {
 			clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
 			ivtv_set_cc(itv, 3, &cc);
 		}
 		while (vi->cc_payload_idx) {
 			cc = vi->cc_payload[0];

 			memmove(vi->cc_payload, vi->cc_payload + 1,
 					sizeof(vi->cc_payload) - sizeof(vi->cc_payload[0]));
 			vi->cc_payload_idx--;
 			if (vi->cc_payload_idx && cc.odd[0] == 0x80 && cc.odd[1] == 0x80)
 				continue;

 			ivtv_set_cc(itv, 3, &cc);
 			break;
 		}
 	}

 	if (test_and_clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags)) {
 		ivtv_set_vps(itv, 1);
 	}
 }
	/*
	Vertical Blank Interval support functions
	Copyright (C) 2004-2007 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include "ivtv-driver.h"
	#include "ivtv-i2c.h"
	#include "ivtv-ioctl.h"
	#include "ivtv-queue.h"
	#include "ivtv-cards.h"
	#include "ivtv-vbi.h"

	static void ivtv_set_vps(struct ivtv *itv, int enabled)
	{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
	return;
	data.id = V4L2_SLICED_VPS;
	data.field = 0;
	data.line = enabled ? 16 : 0;
	data.data[2] = itv->vbi.vps_payload.data[0];
	data.data[8] = itv->vbi.vps_payload.data[1];
	data.data[9] = itv->vbi.vps_payload.data[2];
	data.data[10] = itv->vbi.vps_payload.data[3];
	data.data[11] = itv->vbi.vps_payload.data[4];
	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
	}

	static void ivtv_set_cc(struct ivtv itv, int mode, const struct vbi_cc cc)
	{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
	return;
	data.id = V4L2_SLICED_CAPTION_525;
	data.field = 0;
	data.line = (mode & 1) ? 21 : 0;
	data.data[0] = cc->odd[0];
	data.data[1] = cc->odd[1];
	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
	data.field = 1;
	data.line = (mode & 2) ? 21 : 0;
	data.data[0] = cc->even[0];
	data.data[1] = cc->even[1];
	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
	}

	static void ivtv_set_wss(struct ivtv *itv, int enabled, int mode)
	{
	struct v4l2_sliced_vbi_data data;

	if (!(itv->v4l2_cap & V4L2_CAP_VIDEO_OUTPUT))
	return;
	/* When using a 50 Hz system, always turn on the
	wide screen signal with 4x3 ratio as the default.
	Turning this signal on and off can confuse certain
	TVs. As far as I can tell there is no reason not to
	transmit this signal. */
	if ((itv->std_out & V4L2_STD_625_50) && !enabled) {
	enabled = 1;
	mode = 0x08; /* 4x3 full format */
	}
	data.id = V4L2_SLICED_WSS_625;
	data.field = 0;
	data.line = enabled ? 23 : 0;
	data.data[0] = mode & 0xff;
	data.data[1] = (mode >> 8) & 0xff;
	ivtv_call_hw(itv, IVTV_HW_SAA7127, vbi, s_vbi_data, &data);
	}

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

	return c & 1;
	}

	static void ivtv_write_vbi_line(struct ivtv *itv,
	const struct v4l2_sliced_vbi_data *d,
	struct vbi_cc cc, int found_cc)
	{
	struct vbi_info *vi = &itv->vbi;

	if (d->id == V4L2_SLICED_CAPTION_525 && d->line == 21) {
	if (d->field) {
	cc->even[0] = d->data[0];
	cc->even[1] = d->data[1];
	} else {
	cc->odd[0] = d->data[0];
	cc->odd[1] = d->data[1];
	}
	*found_cc = 1;
	} else if (d->id == V4L2_SLICED_VPS && d->line == 16 && d->field == 0) {
	struct vbi_vps vps;

	vps.data[0] = d->data[2];
	vps.data[1] = d->data[8];
	vps.data[2] = d->data[9];
	vps.data[3] = d->data[10];
	vps.data[4] = d->data[11];
	if (memcmp(&vps, &vi->vps_payload, sizeof(vps))) {
	vi->vps_payload = vps;
	set_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags);
	}
	} else if (d->id == V4L2_SLICED_WSS_625 &&
	d->line == 23 && d->field == 0) {
	int wss = d->data[0] \| d->data[1] << 8;

	if (vi->wss_payload != wss) {
	vi->wss_payload = wss;
	set_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags);
	}
	}
	}

	static void ivtv_write_vbi_cc_lines(struct ivtv itv, const struct vbi_cc cc)
	{
	struct vbi_info *vi = &itv->vbi;

	if (vi->cc_payload_idx < ARRAY_SIZE(vi->cc_payload)) {
	memcpy(&vi->cc_payload[vi->cc_payload_idx], cc,
	sizeof(struct vbi_cc));
	vi->cc_payload_idx++;
	set_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
	}
	}

	static void ivtv_write_vbi(struct ivtv *itv,
	const struct v4l2_sliced_vbi_data *sliced,
	size_t cnt)
	{
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
	int found_cc = 0;
	size_t i;

	for (i = 0; i < cnt; i++)
	ivtv_write_vbi_line(itv, sliced + i, &cc, &found_cc);

	if (found_cc)
	ivtv_write_vbi_cc_lines(itv, &cc);
	}

	ssize_t
	ivtv_write_vbi_from_user(struct ivtv *itv,
	const struct v4l2_sliced_vbi_data __user *sliced,
	size_t cnt)
	{
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };
	int found_cc = 0;
	size_t i;
	struct v4l2_sliced_vbi_data d;
	ssize_t ret = cnt * sizeof(struct v4l2_sliced_vbi_data);

	for (i = 0; i < cnt; i++) {
	if (copy_from_user(&d, sliced + i,
	sizeof(struct v4l2_sliced_vbi_data))) {
	ret = -EFAULT;
	break;
	}
	ivtv_write_vbi_line(itv, &d, &cc, &found_cc);
	}

	if (found_cc)
	ivtv_write_vbi_cc_lines(itv, &cc);

	return ret;
	}

	static void copy_vbi_data(struct ivtv *itv, int lines, u32 pts_stamp)
	{
	int line = 0;
	int i;
	u32 linemask[2] = { 0, 0 };
	unsigned short size;
	static const u8 mpeg_hdr_data[] = {
	0x00, 0x00, 0x01, 0xba, 0x44, 0x00, 0x0c, 0x66,
	0x24, 0x01, 0x01, 0xd1, 0xd3, 0xfa, 0xff, 0xff,
	0x00, 0x00, 0x01, 0xbd, 0x00, 0x1a, 0x84, 0x80,
	0x07, 0x21, 0x00, 0x5d, 0x63, 0xa7, 0xff, 0xff
	};
	const int sd = sizeof(mpeg_hdr_data); /* start of vbi data */
	int idx = itv->vbi.frame % IVTV_VBI_FRAMES;
	u8 *dst = &itv->vbi.sliced_mpeg_data[idx][0];

	for (i = 0; i < lines; i++) {
	int f, l;

	if (itv->vbi.sliced_data[i].id == 0)
	continue;

	l = itv->vbi.sliced_data[i].line - 6;
	f = itv->vbi.sliced_data[i].field;
	if (f)
	l += 18;
	if (l < 32)
	linemask[0] \|= (1 << l);
	else
	linemask[1] \|= (1 << (l - 32));
	dst[sd + 12 + line * 43] =
	ivtv_service2vbi(itv->vbi.sliced_data[i].id);
	memcpy(dst + sd + 12 + line * 43 + 1, itv->vbi.sliced_data[i].data, 42);
	line++;
	}
	memcpy(dst, mpeg_hdr_data, sizeof(mpeg_hdr_data));
	if (line == 36) {
	/* All lines are used, so there is no space for the linemask
	(the max size of the VBI data is 36 * 43 + 4 bytes).
	So in this case we use the magic number 'ITV0'. */
	memcpy(dst + sd, "ITV0", 4);
	memmove(dst + sd + 4, dst + sd + 12, line * 43);
	size = 4 + ((43 * line + 3) & ~3);
	} else {
	memcpy(dst + sd, "itv0", 4);
	cpu_to_le32s(&linemask[0]);
	cpu_to_le32s(&linemask[1]);
	memcpy(dst + sd + 4, &linemask[0], 8);
	size = 12 + ((43 * line + 3) & ~3);
	}
	dst[4+16] = (size + 10) >> 8;
	dst[5+16] = (size + 10) & 0xff;
	dst[9+16] = 0x21 \| ((pts_stamp >> 29) & 0x6);
	dst[10+16] = (pts_stamp >> 22) & 0xff;
	dst[11+16] = 1 \| ((pts_stamp >> 14) & 0xff);
	dst[12+16] = (pts_stamp >> 7) & 0xff;
	dst[13+16] = 1 \| ((pts_stamp & 0x7f) << 1);
	itv->vbi.sliced_mpeg_size[idx] = sd + size;
	}

	static int ivtv_convert_ivtv_vbi(struct ivtv itv, u8 p)
	{
	u32 linemask[2];
	int i, l, id2;
	int line = 0;

	if (!memcmp(p, "itv0", 4)) {
	memcpy(linemask, p + 4, 8);
	p += 12;
	} else if (!memcmp(p, "ITV0", 4)) {
	linemask[0] = 0xffffffff;
	linemask[1] = 0xf;
	p += 4;
	} else {
	/* unknown VBI data, convert to empty VBI frame */
	linemask[0] = linemask[1] = 0;
	}
	for (i = 0; i < 36; i++) {
	int err = 0;

	if (i < 32 && !(linemask[0] & (1 << i)))
	continue;
	if (i >= 32 && !(linemask[1] & (1 << (i - 32))))
	continue;
	id2 = *p & 0xf;
	switch (id2) {
	case IVTV_SLICED_TYPE_TELETEXT_B:
	id2 = V4L2_SLICED_TELETEXT_B;
	break;
	case IVTV_SLICED_TYPE_CAPTION_525:
	id2 = V4L2_SLICED_CAPTION_525;
	err = !odd_parity(p[1]) \|\| !odd_parity(p[2]);
	break;
	case IVTV_SLICED_TYPE_VPS:
	id2 = V4L2_SLICED_VPS;
	break;
	case IVTV_SLICED_TYPE_WSS_625:
	id2 = V4L2_SLICED_WSS_625;
	break;
	default:
	id2 = 0;
	break;
	}
	if (err == 0) {
	l = (i < 18) ? i + 6 : i - 18 + 6;
	itv->vbi.sliced_dec_data[line].line = l;
	itv->vbi.sliced_dec_data[line].field = i >= 18;
	itv->vbi.sliced_dec_data[line].id = id2;
	memcpy(itv->vbi.sliced_dec_data[line].data, p + 1, 42);
	line++;
	}
	p += 43;
	}
	while (line < 36) {
	itv->vbi.sliced_dec_data[line].id = 0;
	itv->vbi.sliced_dec_data[line].line = 0;
	itv->vbi.sliced_dec_data[line].field = 0;
	line++;
	}
	return line * sizeof(itv->vbi.sliced_dec_data[0]);
	}

	/* Compress raw VBI format, removes leading SAV codes and surplus space after the
	field.
	Returns new compressed size. */
	static u32 compress_raw_buf(struct ivtv itv, u8 buf, u32 size)
	{
	u32 line_size = itv->vbi.raw_decoder_line_size;
	u32 lines = itv->vbi.count;
	u8 sav1 = itv->vbi.raw_decoder_sav_odd_field;
	u8 sav2 = itv->vbi.raw_decoder_sav_even_field;
	u8 *q = buf;
	u8 *p;
	int i;

	for (i = 0; i < lines; i++) {
	p = buf + i * line_size;

	/* Look for SAV code */
	if (p[0] != 0xff \|\| p[1] \|\| p[2] \|\| (p[3] != sav1 && p[3] != sav2)) {
	break;
	}
	memcpy(q, p + 4, line_size - 4);
	q += line_size - 4;
	}
	return lines * (line_size - 4);
	}


	/* Compressed VBI format, all found sliced blocks put next to one another
	Returns new compressed size */
	static u32 compress_sliced_buf(struct ivtv itv, u32 line, u8 buf, u32 size, u8 sav)
	{
	u32 line_size = itv->vbi.sliced_decoder_line_size;
	struct v4l2_decode_vbi_line vbi;
	int i;
	unsigned lines = 0;

	/* find the first valid line */
	for (i = 0; i < size; i++, buf++) {
	if (buf[0] == 0xff && !buf[1] && !buf[2] && buf[3] == sav)
	break;
	}

	size -= i;
	if (size < line_size) {
	return line;
	}
	for (i = 0; i < size / line_size; i++) {
	u8 p = buf + i line_size;

	/* Look for SAV code */
	if (p[0] != 0xff \|\| p[1] \|\| p[2] \|\| p[3] != sav) {
	continue;
	}
	vbi.p = p + 4;
	v4l2_subdev_call(itv->sd_video, vbi, decode_vbi_line, &vbi);
	if (vbi.type && !(lines & (1 << vbi.line))) {
	lines \|= 1 << vbi.line;
	itv->vbi.sliced_data[line].id = vbi.type;
	itv->vbi.sliced_data[line].field = vbi.is_second_field;
	itv->vbi.sliced_data[line].line = vbi.line;
	memcpy(itv->vbi.sliced_data[line].data, vbi.p, 42);
	line++;
	}
	}
	return line;
	}

	void ivtv_process_vbi_data(struct ivtv itv, struct ivtv_buffer buf,
	u64 pts_stamp, int streamtype)
	{
	u8 p = (u8 ) buf->buf;
	u32 size = buf->bytesused;
	int y;

	/* Raw VBI data */
	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI && ivtv_raw_vbi(itv)) {
	u8 type;

	ivtv_buf_swap(buf);

	type = p[3];

	size = buf->bytesused = compress_raw_buf(itv, p, size);

	/* second field of the frame? */
	if (type == itv->vbi.raw_decoder_sav_even_field) {
	/* Dirty hack needed for backwards
	compatibility of old VBI software. */
	p += size - 4;
	memcpy(p, &itv->vbi.frame, 4);
	itv->vbi.frame++;
	}
	return;
	}

	/* Sliced VBI data with data insertion */
	if (streamtype == IVTV_ENC_STREAM_TYPE_VBI) {
	int lines;

	ivtv_buf_swap(buf);

	/* first field */
	lines = compress_sliced_buf(itv, 0, p, size / 2,
	itv->vbi.sliced_decoder_sav_odd_field);
	/* second field */
	/* experimentation shows that the second half does not always begin
	at the exact address. So start a bit earlier (hence 32). */
	lines = compress_sliced_buf(itv, lines, p + size / 2 - 32, size / 2 + 32,
	itv->vbi.sliced_decoder_sav_even_field);
	/* always return at least one empty line */
	if (lines == 0) {
	itv->vbi.sliced_data[0].id = 0;
	itv->vbi.sliced_data[0].line = 0;
	itv->vbi.sliced_data[0].field = 0;
	lines = 1;
	}
	buf->bytesused = size = lines * sizeof(itv->vbi.sliced_data[0]);
	memcpy(p, &itv->vbi.sliced_data[0], size);

	if (itv->vbi.insert_mpeg) {
	copy_vbi_data(itv, lines, pts_stamp);
	}
	itv->vbi.frame++;
	return;
	}

	/* Sliced VBI re-inserted from an MPEG stream */
	if (streamtype == IVTV_DEC_STREAM_TYPE_VBI) {
	/* If the size is not 4-byte aligned, then the starting address
	for the swapping is also shifted. After swapping the data the
	real start address of the VBI data is exactly 4 bytes after the
	original start. It's a bit fiddly but it works like a charm.
	Non-4-byte alignment happens when an lseek is done on the input
	mpeg file to a non-4-byte aligned position. So on arrival here
	the VBI data is also non-4-byte aligned. */
	int offset = size & 3;
	int cnt;

	if (offset) {
	p += 4 - offset;
	}
	/* Swap Buffer */
	for (y = 0; y < size; y += 4) {
	swab32s((u32 *)(p + y));
	}

	cnt = ivtv_convert_ivtv_vbi(itv, p + offset);
	memcpy(buf->buf, itv->vbi.sliced_dec_data, cnt);
	buf->bytesused = cnt;

	ivtv_write_vbi(itv, itv->vbi.sliced_dec_data,
	cnt / sizeof(itv->vbi.sliced_dec_data[0]));
	return;
	}
	}

	void ivtv_disable_cc(struct ivtv *itv)
	{
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

	clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
	ivtv_set_cc(itv, 0, &cc);
	itv->vbi.cc_payload_idx = 0;
	}


	void ivtv_vbi_work_handler(struct ivtv *itv)
	{
	struct vbi_info *vi = &itv->vbi;
	struct v4l2_sliced_vbi_data data;
	struct vbi_cc cc = { .odd = { 0x80, 0x80 }, .even = { 0x80, 0x80 } };

	/* Lock */
	if (itv->output_mode == OUT_PASSTHROUGH) {
	if (itv->is_50hz) {
	data.id = V4L2_SLICED_WSS_625;
	data.field = 0;

	if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
	ivtv_set_wss(itv, 1, data.data[0] & 0xf);
	vi->wss_missing_cnt = 0;
	} else if (vi->wss_missing_cnt == 4) {
	ivtv_set_wss(itv, 1, 0x8); /* 4x3 full format */
	} else {
	vi->wss_missing_cnt++;
	}
	}
	else {
	int mode = 0;

	data.id = V4L2_SLICED_CAPTION_525;
	data.field = 0;
	if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
	mode \|= 1;
	cc.odd[0] = data.data[0];
	cc.odd[1] = data.data[1];
	}
	data.field = 1;
	if (v4l2_subdev_call(itv->sd_video, vbi, g_vbi_data, &data) == 0) {
	mode \|= 2;
	cc.even[0] = data.data[0];
	cc.even[1] = data.data[1];
	}
	if (mode) {
	vi->cc_missing_cnt = 0;
	ivtv_set_cc(itv, mode, &cc);
	} else if (vi->cc_missing_cnt == 4) {
	ivtv_set_cc(itv, 0, &cc);
	} else {
	vi->cc_missing_cnt++;
	}
	}
	return;
	}

	if (test_and_clear_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags)) {
	ivtv_set_wss(itv, 1, vi->wss_payload & 0xf);
	}

	if (test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags)) {
	if (vi->cc_payload_idx == 0) {
	clear_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags);
	ivtv_set_cc(itv, 3, &cc);
	}
	while (vi->cc_payload_idx) {
	cc = vi->cc_payload[0];

	memmove(vi->cc_payload, vi->cc_payload + 1,
	sizeof(vi->cc_payload) - sizeof(vi->cc_payload[0]));
	vi->cc_payload_idx--;
	if (vi->cc_payload_idx && cc.odd[0] == 0x80 && cc.odd[1] == 0x80)
	continue;

	ivtv_set_cc(itv, 3, &cc);
	break;
	}
	}

	if (test_and_clear_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags)) {
	ivtv_set_vps(itv, 1);
	}
	}