include/sound/ac97/controller.h

Source file repositories/reference/linux-study-clean/include/sound/ac97/controller.h

File Facts

System
Linux kernel
Corpus path
include/sound/ac97/controller.h
Extension
.h
Size
2619 bytes
Lines
83
Domain
Driver Families
Bucket
include/sound
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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);
#else
static 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 void
snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
{
}
#endif

#endif

Annotation

Implementation Notes