path: root/drivers/media/video/cx18/cx18-ioctl.c

/*
 *  cx18 ioctl system call
 *
 *  Derived from ivtv-ioctl.c
 *
 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
 *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
 *
 *  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 "cx18-driver.h"
#include "cx18-io.h"
#include "cx18-version.h"
#include "cx18-mailbox.h"
#include "cx18-i2c.h"
#include "cx18-queue.h"
#include "cx18-fileops.h"
#include "cx18-vbi.h"
#include "cx18-audio.h"
#include "cx18-video.h"
#include "cx18-streams.h"
#include "cx18-ioctl.h"
#include "cx18-gpio.h"
#include "cx18-controls.h"
#include "cx18-cards.h"
#include "cx18-av-core.h"
#include <media/tveeprom.h>
#include <media/v4l2-chip-ident.h>

u16 cx18_service2vbi(int type)
{
	switch (type) {
	case V4L2_SLICED_TELETEXT_B:
		return CX18_SLICED_TYPE_TELETEXT_B;
	case V4L2_SLICED_CAPTION_525:
		return CX18_SLICED_TYPE_CAPTION_525;
	case V4L2_SLICED_WSS_625:
		return CX18_SLICED_TYPE_WSS_625;
	case V4L2_SLICED_VPS:
		return CX18_SLICED_TYPE_VPS;
	default:
		return 0;
	}
}

/* Check if VBI services are allowed on the (field, line) for the video std */
static int valid_service_line(int field, int line, int is_pal)
{
	return (is_pal && line >= 6 &&
		((field == 0 && line <= 23) || (field == 1 && line <= 22))) ||
	       (!is_pal && line >= 10 && line < 22);
}

/*
 * For a (field, line, std) and inbound potential set of services for that line,
 * return the first valid service of those passed in the incoming set for that
 * line in priority order:
 * CC, VPS, or WSS over TELETEXT for well known lines
 * TELETEXT, before VPS, before CC, before WSS, for other lines
 */
static u16 select_service_from_set(int field, int line, u16 set, int is_pal)
{
	u16 valid_set = (is_pal ? V4L2_SLICED_VBI_625 : V4L2_SLICED_VBI_525);
	int i;

	set = set & valid_set;
	if (set == 0 || !valid_service_line(field, line, is_pal))
		return 0;
	if (!is_pal) {
		if (line == 21 && (set & V4L2_SLICED_CAPTION_525))
			return V4L2_SLICED_CAPTION_525;
	} else {
		if (line == 16 && field == 0 && (set & V4L2_SLICED_VPS))
			return V4L2_SLICED_VPS;
		if (line == 23 && field == 0 && (set & V4L2_SLICED_WSS_625))
			return V4L2_SLICED_WSS_625;
		if (line == 23)
			return 0;
	}
	for (i = 0; i < 32; i++) {
		if ((1 << i) & set)
			return 1 << i;
	}
	return 0;
}

/*
 * Expand the service_set of *fmt into valid service_lines for the std,
 * and clear the passed in fmt->service_set
 */
void cx18_expand_service_set(struct v4l2_sliced_vbi_format *fmt, int is_pal)
{
	u16 set = fmt->service_set;
	int f, l;

	fmt->service_set = 0;
	for (f = 0; f < 2; f++) {
		for (l = 0; l < 24; l++)
			fmt->service_lines[f][l] = select_service_from_set(f, l, set, is_pal);
	}
}

/*
 * Sanitize the service_lines in *fmt per the video std, and return 1
 * if any service_line is left as valid after santization
 */
static int check_service_set(struct v4l2_sliced_vbi_format *fmt, int is_pal)
{
	int f, l;
	u16 set = 0;