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