84 lines
2.6 KiB
C
Executable file
84 lines
2.6 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
|
|
*/
|
|
|
|
#ifndef AC97_CONTROLLER_H
|
|
#define AC97_CONTROLLER_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/list.h>
|
|
|
|
#define AC97_BUS_MAX_CODECS 4
|
|
#define AC97_SLOTS_AVAILABLE_ALL 0xf
|
|
|
|
struct ac97_controller_ops;
|
|
|
|
/**
|
|
* struct ac97_controller - The AC97 controller of the AC-Link
|
|
* @ops: the AC97 operations.
|
|
* @controllers: linked list of all existing controllers.
|
|
* @adap: the shell device ac97-%d, ie. ac97 adapter
|
|
* @nr: the number of the shell device
|
|
* @slots_available: the mask of accessible/scanable codecs.
|
|
* @parent: the device providing the AC97 controller.
|
|
* @codecs: the 4 possible AC97 codecs (NULL if none found).
|
|
* @codecs_pdata: platform_data for each codec (NULL if no pdata).
|
|
*
|
|
* This structure is internal to AC97 bus, and should not be used by the
|
|
* controllers themselves, excepting for using @dev.
|
|
*/
|
|
struct ac97_controller {
|
|
const struct ac97_controller_ops *ops;
|
|
struct list_head controllers;
|
|
struct device adap;
|
|
int nr;
|
|
unsigned short slots_available;
|
|
struct device *parent;
|
|
struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS];
|
|
void *codecs_pdata[AC97_BUS_MAX_CODECS];
|
|
};
|
|
|
|
/**
|
|
* struct ac97_controller_ops - The AC97 operations
|
|
* @reset: Cold reset of the AC97 AC-Link.
|
|
* @warm_reset: Warm reset of the AC97 AC-Link.
|
|
* @read: Read of a single AC97 register.
|
|
* Returns the register value or a negative error code.
|
|
* @write: Write of a single AC97 register.
|
|
*
|
|
* These are the basic operation an AC97 controller must provide for an AC97
|
|
* access functions. Amongst these, all but the last 2 are mandatory.
|
|
* The slot number is also known as the AC97 codec number, between 0 and 3.
|
|
*/
|
|
struct ac97_controller_ops {
|
|
void (*reset)(struct ac97_controller *adrv);
|
|
void (*warm_reset)(struct ac97_controller *adrv);
|
|
int (*write)(struct ac97_controller *adrv, int slot,
|
|
unsigned short reg, unsigned short val);
|
|
int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg);
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
|
|
struct ac97_controller *snd_ac97_controller_register(
|
|
const struct ac97_controller_ops *ops, struct device *dev,
|
|
unsigned short slots_available, void **codecs_pdata);
|
|
void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);
|
|
#else
|
|
static inline struct ac97_controller *
|
|
snd_ac97_controller_register(const struct ac97_controller_ops *ops,
|
|
struct device *dev,
|
|
unsigned short slots_available,
|
|
void **codecs_pdata)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void
|
|
snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif
|