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AC97 is a bus for sound usage. It enables for a AC97 AC-Link to link one controller to 0 to 4 AC97 codecs. The goal of this new implementation is to implement a device/driver model for AC97, with an automatic scan of the bus and automatic discovery of AC97 codec devices. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*
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* Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef AC97_CONTROLLER_H
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#define AC97_CONTROLLER_H
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#include <linux/device.h>
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#include <linux/list.h>
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#define AC97_BUS_MAX_CODECS 4
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#define AC97_SLOTS_AVAILABLE_ALL 0xf
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struct ac97_controller_ops;
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/**
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* struct ac97_controller - The AC97 controller of the AC-Link
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* @ops: the AC97 operations.
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* @controllers: linked list of all existing controllers.
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* @adap: the shell device ac97-%d, ie. ac97 adapter
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* @nr: the number of the shell device
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* @slots_available: the mask of accessible/scanable codecs.
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* @parent: the device providing the AC97 controller.
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* @codecs: the 4 possible AC97 codecs (NULL if none found).
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* @codecs_pdata: platform_data for each codec (NULL if no pdata).
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*
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* This structure is internal to AC97 bus, and should not be used by the
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* controllers themselves, excepting for using @dev.
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*/
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struct ac97_controller {
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const struct ac97_controller_ops *ops;
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struct list_head controllers;
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struct device adap;
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int nr;
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unsigned short slots_available;
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struct device *parent;
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struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS];
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void *codecs_pdata[AC97_BUS_MAX_CODECS];
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};
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/**
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* struct ac97_controller_ops - The AC97 operations
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* @reset: Cold reset of the AC97 AC-Link.
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* @warm_reset: Warm reset of the AC97 AC-Link.
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* @read: Read of a single AC97 register.
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* Returns the register value or a negative error code.
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* @write: Write of a single AC97 register.
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*
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* These are the basic operation an AC97 controller must provide for an AC97
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* access functions. Amongst these, all but the last 2 are mandatory.
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* The slot number is also known as the AC97 codec number, between 0 and 3.
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*/
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struct ac97_controller_ops {
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void (*reset)(struct ac97_controller *adrv);
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void (*warm_reset)(struct ac97_controller *adrv);
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int (*write)(struct ac97_controller *adrv, int slot,
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unsigned short reg, unsigned short val);
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int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg);
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};
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#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
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struct ac97_controller *snd_ac97_controller_register(
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const struct ac97_controller_ops *ops, struct device *dev,
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unsigned short slots_available, void **codecs_pdata);
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void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);
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#else
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static inline struct ac97_controller *
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snd_ac97_controller_register(const struct ac97_controller_ops *ops,
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struct device *dev,
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unsigned short slots_available,
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void **codecs_pdata)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline void
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snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
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{
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}
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#endif
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#endif
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