aoa-gpio.h

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/*
 * Apple Onboard Audio GPIO definitions
 *
 * Copyright 2006 Johannes Berg <[email protected]>
 *
 * GPL v2, can be found in COPYING.
 */

#ifndef __AOA_GPIO_H
#define __AOA_GPIO_H
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <asm/prom.h>

typedef void (*notify_func_t)(void *data);

enum notify_type {
    AOA_NOTIFY_HEADPHONE,
    AOA_NOTIFY_LINE_IN,
    AOA_NOTIFY_LINE_OUT,
};

struct gpio_runtime;
struct gpio_methods {
    /* for initialisation/de-initialisation of the GPIO layer */
    void (*init)(struct gpio_runtime *rt);
    void (*exit)(struct gpio_runtime *rt);

    /* turn off headphone, speakers, lineout */
    void (*all_amps_off)(struct gpio_runtime *rt);
    /* turn headphone, speakers, lineout back to previous setting */
    void (*all_amps_restore)(struct gpio_runtime *rt);

    void (*set_headphone)(struct gpio_runtime *rt, int on);
    void (*set_speakers)(struct gpio_runtime *rt, int on);
    void (*set_lineout)(struct gpio_runtime *rt, int on);
    void (*set_master)(struct gpio_runtime *rt, int on);

    int (*get_headphone)(struct gpio_runtime *rt);
    int (*get_speakers)(struct gpio_runtime *rt);
    int (*get_lineout)(struct gpio_runtime *rt);
    int (*get_master)(struct gpio_runtime *rt);

    void (*set_hw_reset)(struct gpio_runtime *rt, int on);

    /* use this to be notified of any events. The notification
     * function is passed the data, and is called in process
     * context by the use of schedule_work.
     * The interface for it is that setting a function to NULL
     * removes it, and they return 0 if the operation succeeded,
     * and -EBUSY if the notification is already assigned by
     * someone else. */
    int (*set_notify)(struct gpio_runtime *rt,
              enum notify_type type,
              notify_func_t notify,
              void *data);
    /* returns 0 if not plugged in, 1 if plugged in
     * or a negative error code */
    int (*get_detect)(struct gpio_runtime *rt,
              enum notify_type type);
};

struct gpio_notification {
    struct delayed_work work;
    notify_func_t notify;
    void *data;
    void *gpio_private;
    struct mutex mutex;
};

struct gpio_runtime {
    /* to be assigned by fabric */
    struct device_node *node;
    /* since everyone needs this pointer anyway... */
    struct gpio_methods *methods;
    /* to be used by the gpio implementation */
    int implementation_private;
    struct gpio_notification headphone_notify;
    struct gpio_notification line_in_notify;
    struct gpio_notification line_out_notify;
};

#endif /* __AOA_GPIO_H */