102 lines · c
1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Framework for ISA radio drivers.4 * This takes care of all the V4L2 scaffolding, allowing the ISA drivers5 * to concentrate on the actual hardware operation.6 *7 * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com>8 */9 10#ifndef _RADIO_ISA_H_11#define _RADIO_ISA_H_12 13#include <linux/isa.h>14#include <linux/pnp.h>15#include <linux/videodev2.h>16#include <media/v4l2-device.h>17#include <media/v4l2-ctrls.h>18 19struct radio_isa_driver;20struct radio_isa_ops;21 22/* Core structure for radio ISA cards */23struct radio_isa_card {24 const struct radio_isa_driver *drv;25 struct v4l2_device v4l2_dev;26 struct v4l2_ctrl_handler hdl;27 struct video_device vdev;28 struct mutex lock;29 const struct radio_isa_ops *ops;30 struct { /* mute/volume cluster */31 struct v4l2_ctrl *mute;32 struct v4l2_ctrl *volume;33 };34 /* I/O port */35 int io;36 37 /* Card is in stereo audio mode */38 bool stereo;39 /* Current frequency */40 u32 freq;41};42 43struct radio_isa_ops {44 /* Allocate and initialize a radio_isa_card struct */45 struct radio_isa_card *(*alloc)(void);46 /* Probe whether a card is present at the given port */47 bool (*probe)(struct radio_isa_card *isa, int io);48 /* Special card initialization can be done here, this is called after49 * the standard controls are registered, but before they are setup,50 * thus allowing drivers to add their own controls here. */51 int (*init)(struct radio_isa_card *isa);52 /* Set mute and volume. */53 int (*s_mute_volume)(struct radio_isa_card *isa, bool mute, int volume);54 /* Set frequency */55 int (*s_frequency)(struct radio_isa_card *isa, u32 freq);56 /* Set stereo/mono audio mode */57 int (*s_stereo)(struct radio_isa_card *isa, bool stereo);58 /* Get rxsubchans value for VIDIOC_G_TUNER */59 u32 (*g_rxsubchans)(struct radio_isa_card *isa);60 /* Get the signal strength for VIDIOC_G_TUNER */61 u32 (*g_signal)(struct radio_isa_card *isa);62};63 64/* Top level structure needed to instantiate the cards */65struct radio_isa_driver {66 struct isa_driver driver;67#ifdef CONFIG_PNP68 struct pnp_driver pnp_driver;69#endif70 const struct radio_isa_ops *ops;71 /* The module_param_array with the specified I/O ports */72 int *io_params;73 /* The module_param_array with the radio_nr values */74 int *radio_nr_params;75 /* Whether we should probe for possible cards */76 bool probe;77 /* The list of possible I/O ports */78 const int *io_ports;79 /* The size of that list */80 int num_of_io_ports;81 /* The region size to request */82 unsigned region_size;83 /* The name of the card */84 const char *card;85 /* Card can capture stereo audio */86 bool has_stereo;87 /* The maximum volume for the volume control. If 0, then there88 is no volume control possible. */89 int max_volume;90};91 92int radio_isa_match(struct device *pdev, unsigned int dev);93int radio_isa_probe(struct device *pdev, unsigned int dev);94void radio_isa_remove(struct device *pdev, unsigned int dev);95#ifdef CONFIG_PNP96int radio_isa_pnp_probe(struct pnp_dev *dev,97 const struct pnp_device_id *dev_id);98void radio_isa_pnp_remove(struct pnp_dev *dev);99#endif100 101#endif102