linux/drivers/media/radio/wl128x/fmdrv_v4l2.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  FM Driver for Connectivity chip of Texas Instruments.
 *  This file provides interfaces to V4L2 subsystem.
 *
 *  This module registers with V4L2 subsystem as Radio
 *  data system interface (/dev/radio). During the registration,
 *  it will expose two set of function pointers.
 *
 *    1) File operation related API (open, close, read, write, poll...etc).
 *    2) Set of V4L2 IOCTL complaint API.
 *
 *  Copyright (C) 2011 Texas Instruments
 *  Author: Raja Mani <[email protected]>
 *  Author: Manjunatha Halli <[email protected]>
 */

#include <linux/export.h>

#include "fmdrv.h"
#include "fmdrv_v4l2.h"
#include "fmdrv_common.h"
#include "fmdrv_rx.h"
#include "fmdrv_tx.h"

static struct video_device gradio_dev;
static u8 radio_disconnected;

/* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */

/* Read RX RDS data */
static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
					size_t count, loff_t *ppos)
{ … }

/* Write TX RDS data */
static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
		size_t count, loff_t *ppos)
{ … }

static __poll_t fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
{ … }

/*
 * Handle open request for "/dev/radioX" device.
 * Start with FM RX mode as default.
 */
static int fm_v4l2_fops_open(struct file *file)
{ … }

static int fm_v4l2_fops_release(struct file *file)
{ … }

/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
		struct v4l2_capability *capability)
{ … }

static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{ … }

static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
{ … }

static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
		struct v4l2_audio *audio)
{ … }

static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
		const struct v4l2_audio *audio)
{ … }

/* Get tuner attributes. If current mode is NOT RX, return error */
static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
		struct v4l2_tuner *tuner)
{ … }

/*
 * Set tuner attributes. If current mode is NOT RX, set to RX.
 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 * Should we set other tuner attributes, too?
 */
static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
		const struct v4l2_tuner *tuner)
{ … }

/* Get tuner or modulator radio frequency */
static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
		struct v4l2_frequency *freq)
{ … }

/* Set tuner or modulator radio frequency */
static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
		const struct v4l2_frequency *freq)
{ … }

/* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
		const struct v4l2_hw_freq_seek *seek)
{ … }
/* Get modulator attributes. If mode is not TX, return no attributes. */
static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
		struct v4l2_modulator *mod)
{ … }

/* Set modulator attributes. If mode is not TX, set to TX. */
static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
		const struct v4l2_modulator *mod)
{ … }

static const struct v4l2_file_operations fm_drv_fops = …;

static const struct v4l2_ctrl_ops fm_ctrl_ops = …;
static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = …;

/* V4L2 RADIO device parent structure */
static const struct video_device fm_viddev_template = …;

int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
{ … }

void *fm_v4l2_deinit_video_device(void)
{ … }