/* 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 snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);#elsestatic inline struct ac97_controller *snd_ac97_controller_register(const struct ac97_controller_ops *ops,			     struct device *dev,			     unsigned short slots_available){	return ERR_PTR(-ENODEV);} static inline voidsnd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl){}#endif #endif