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/* SPDX-License-Identifier: GPL-2.0-only */
* Framework for ISA radio drivers.
* This takes care of all the V4L2 scaffolding, allowing the ISA drivers
* to concentrate on the actual hardware operation.
* Copyright (C) 2012 Hans Verkuil <>
#ifndef _RADIO_ISA_H_
#define _RADIO_ISA_H_
#include <linux/isa.h>
#include <linux/pnp.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
struct radio_isa_driver;
struct radio_isa_ops;
/* Core structure for radio ISA cards */
struct radio_isa_card {
const struct radio_isa_driver *drv;
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler hdl;
struct video_device vdev;
struct mutex lock;
const struct radio_isa_ops *ops;
struct { /* mute/volume cluster */
struct v4l2_ctrl *mute;
struct v4l2_ctrl *volume;
/* I/O port */
int io;
/* Card is in stereo audio mode */
bool stereo;
/* Current frequency */
u32 freq;
struct radio_isa_ops {
/* Allocate and initialize a radio_isa_card struct */
struct radio_isa_card *(*alloc)(void);
/* Probe whether a card is present at the given port */
bool (*probe)(struct radio_isa_card *isa, int io);
/* Special card initialization can be done here, this is called after
* the standard controls are registered, but before they are setup,
* thus allowing drivers to add their own controls here. */
int (*init)(struct radio_isa_card *isa);
/* Set mute and volume. */
int (*s_mute_volume)(struct radio_isa_card *isa, bool mute, int volume);
/* Set frequency */
int (*s_frequency)(struct radio_isa_card *isa, u32 freq);
/* Set stereo/mono audio mode */
int (*s_stereo)(struct radio_isa_card *isa, bool stereo);
/* Get rxsubchans value for VIDIOC_G_TUNER */
u32 (*g_rxsubchans)(struct radio_isa_card *isa);
/* Get the signal strength for VIDIOC_G_TUNER */
u32 (*g_signal)(struct radio_isa_card *isa);
/* Top level structure needed to instantiate the cards */
struct radio_isa_driver {
struct isa_driver driver;
struct pnp_driver pnp_driver;
const struct radio_isa_ops *ops;
/* The module_param_array with the specified I/O ports */
int *io_params;
/* The module_param_array with the radio_nr values */
int *radio_nr_params;
/* Whether we should probe for possible cards */
bool probe;
/* The list of possible I/O ports */
const int *io_ports;
/* The size of that list */
int num_of_io_ports;
/* The region size to request */
unsigned region_size;
/* The name of the card */
const char *card;
/* Card can capture stereo audio */
bool has_stereo;
/* The maximum volume for the volume control. If 0, then there
is no volume control possible. */
int max_volume;
int radio_isa_match(struct device *pdev, unsigned int dev);
int radio_isa_probe(struct device *pdev, unsigned int dev);
void radio_isa_remove(struct device *pdev, unsigned int dev);
int radio_isa_pnp_probe(struct pnp_dev *dev,
const struct pnp_device_id *dev_id);
void radio_isa_pnp_remove(struct pnp_dev *dev);