root/sound/aoa/aoa-gpio.h

INCLUDED FROM

/*
 * Apple Onboard Audio GPIO definitions
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * 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);

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