linux/drivers/media/test-drivers/vivid/vivid-radio-common.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * vivid-radio-common.c - common radio rx/tx support functions.
 *
 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/videodev2.h>

#include "vivid-core.h"
#include "vivid-ctrls.h"
#include "vivid-radio-common.h"
#include "vivid-rds-gen.h"

/*
 * These functions are shared between the vivid receiver and transmitter
 * since both use the same frequency bands.
 */

const struct v4l2_frequency_band vivid_radio_bands[TOT_BANDS] = …;

/*
 * Initialize the RDS generator. If we can loop, then the RDS generator
 * is set up with the values from the RDS TX controls, otherwise it
 * will fill in standard values using one of two alternates.
 */
void vivid_radio_rds_init(struct vivid_dev *dev)
{ … }

/*
 * Calculate the emulated signal quality taking into account the frequency
 * the transmitter is using.
 */
static void vivid_radio_calc_sig_qual(struct vivid_dev *dev)
{ … }

int vivid_radio_g_frequency(struct file *file, const unsigned *pfreq, struct v4l2_frequency *vf)
{ … }

int vivid_radio_s_frequency(struct file *file, unsigned *pfreq, const struct v4l2_frequency *vf)
{ … }