cregit-Linux how code gets into the kernel

Release 4.8 sound/aoa/aoa.h

Directory: sound/aoa
 * Apple Onboard Audio definitions
 * Copyright 2006 Johannes Berg <>
 * GPL v2, can be found in COPYING.

#ifndef __AOA_H

#define __AOA_H
#include <asm/prom.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/asound.h>
#include <sound/control.h>
#include "aoa-gpio.h"
#include "soundbus/soundbus.h"


struct aoa_codec {
char	name[MAX_CODEC_NAME_LEN];

struct module *owner;

	/* called when the fabric wants to init this codec.
         * Do alsa card manipulations from here. */
int (*init)(struct aoa_codec *codec);

	/* called when the fabric is done with the codec.
         * The alsa card will be cleaned up so don't bother. */
void (*exit)(struct aoa_codec *codec);

	/* May be NULL, but can be used by the fabric.
         * Refcounting is the codec driver's responsibility */
struct device_node *node;

	/* assigned by fabric before init() is called, points
         * to the soundbus device. Cannot be NULL. */
struct soundbus_dev *soundbus_dev;

	/* assigned by the fabric before init() is called, points
         * to the fabric's gpio runtime record for the relevant
         * device. */
struct gpio_runtime *gpio;

	/* assigned by the fabric before init() is called, contains
         * a codec specific bitmask of what outputs and inputs are
         * actually connected */
u32 connected;

	/* data the fabric can associate with this structure */
void *fabric_data;

	/* private! */
struct list_head list;
struct aoa_fabric *fabric;

/* return 0 on success */
extern int
aoa_codec_register(struct aoa_codec *codec);
extern void
aoa_codec_unregister(struct aoa_codec *codec);


struct aoa_fabric {

struct module *owner;

	/* once codecs register, they are passed here after.
         * They are of course not initialised, since the
         * fabric is responsible for initialising some fields
         * in the codec structure! */
int (*found_codec)(struct aoa_codec *codec);
	/* called for each codec when it is removed,
         * also in the case that aoa_fabric_unregister
         * is called and all codecs are removed
         * from this fabric.
         * Also called if found_codec returned 0 but
         * the codec couldn't initialise. */
void (*remove_codec)(struct aoa_codec *codec);
	/* If found_codec returned 0, and the codec
         * could be initialised, this is called. */
void (*attached_codec)(struct aoa_codec *codec);

/* return 0 on success, -EEXIST if another fabric is
 * registered, -EALREADY if the same fabric is registered.
 * Passing NULL can be used to test for the presence
 * of another fabric, if -EALREADY is returned there is
 * no other fabric present.
 * In the case that the function returns -EALREADY
 * and the fabric passed is not NULL, all codecs
 * that are not assigned yet are passed to the fabric
 * again for reconsideration. */
extern int
aoa_fabric_register(struct aoa_fabric *fabric, struct device *dev);

/* it is vital to call this when the fabric exits!
 * When calling, the remove_codec will be called
 * for all codecs, unless it is NULL. */
extern void
aoa_fabric_unregister(struct aoa_fabric *fabric);

/* if for some reason you want to get rid of a codec
 * before the fabric is removed, use this.
 * Note that remove_codec is called for it! */
extern void
aoa_fabric_unlink_codec(struct aoa_codec *codec);

/* alsa help methods */

struct aoa_card {
struct snd_card *alsa_card;
extern int aoa_snd_device_new(enum snd_device_type type,
	void * device_data, struct snd_device_ops * ops);
extern struct snd_card *aoa_get_card(void);
extern int aoa_snd_ctl_add(struct snd_kcontrol* control);

/* GPIO stuff */
extern struct gpio_methods *pmf_gpio_methods;
extern struct gpio_methods *ftr_gpio_methods;
/* extern struct gpio_methods *map_gpio_methods; */

#endif /* __AOA_H */

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Directory: sound/aoa
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