linux/drivers/media/test-drivers/vivid/vivid-rds-gen.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * vivid-rds-gen.c - rds (radio data system) generator support functions.
 *
 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/string.h>
#include <linux/videodev2.h>

#include "vivid-rds-gen.h"

static u8 vivid_get_di(const struct vivid_rds_gen *rds, unsigned grp)
{ … }

/*
 * This RDS generator creates 57 RDS groups (one group == four RDS blocks).
 * Groups 0-3, 22-25 and 44-47 (spaced 22 groups apart) are filled with a
 * standard 0B group containing the PI code and PS name.
 *
 * Groups 4-19 and 26-41 use group 2A for the radio text.
 *
 * Group 56 contains the time (group 4A).
 *
 * All remaining groups use a filler group 15B block that just repeats
 * the PI and PTY codes.
 */
void vivid_rds_generate(struct vivid_rds_gen *rds)
{ … }

void vivid_rds_gen_fill(struct vivid_rds_gen *rds, unsigned freq,
			  bool alt)
{ … }