linux/sound/aoa/aoa-gpio.h
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   1/*
   2 * Apple Onboard Audio GPIO definitions
   3 *
   4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5 *
   6 * GPL v2, can be found in COPYING.
   7 */
   8
   9#ifndef __AOA_GPIO_H
  10#define __AOA_GPIO_H
  11#include <linux/workqueue.h>
  12#include <linux/mutex.h>
  13#include <asm/prom.h>
  14
  15typedef void (*notify_func_t)(void *data);
  16
  17enum notify_type {
  18        AOA_NOTIFY_HEADPHONE,
  19        AOA_NOTIFY_LINE_IN,
  20        AOA_NOTIFY_LINE_OUT,
  21};
  22
  23struct gpio_runtime;
  24struct gpio_methods {
  25        /* for initialisation/de-initialisation of the GPIO layer */
  26        void (*init)(struct gpio_runtime *rt);
  27        void (*exit)(struct gpio_runtime *rt);
  28
  29        /* turn off headphone, speakers, lineout */
  30        void (*all_amps_off)(struct gpio_runtime *rt);
  31        /* turn headphone, speakers, lineout back to previous setting */
  32        void (*all_amps_restore)(struct gpio_runtime *rt);
  33
  34        void (*set_headphone)(struct gpio_runtime *rt, int on);
  35        void (*set_speakers)(struct gpio_runtime *rt, int on);
  36        void (*set_lineout)(struct gpio_runtime *rt, int on);
  37        void (*set_master)(struct gpio_runtime *rt, int on);
  38
  39        int (*get_headphone)(struct gpio_runtime *rt);
  40        int (*get_speakers)(struct gpio_runtime *rt);
  41        int (*get_lineout)(struct gpio_runtime *rt);
  42        int (*get_master)(struct gpio_runtime *rt);
  43
  44        void (*set_hw_reset)(struct gpio_runtime *rt, int on);
  45
  46        /* use this to be notified of any events. The notification
  47         * function is passed the data, and is called in process
  48         * context by the use of schedule_work.
  49         * The interface for it is that setting a function to NULL
  50         * removes it, and they return 0 if the operation succeeded,
  51         * and -EBUSY if the notification is already assigned by
  52         * someone else. */
  53        int (*set_notify)(struct gpio_runtime *rt,
  54                          enum notify_type type,
  55                          notify_func_t notify,
  56                          void *data);
  57        /* returns 0 if not plugged in, 1 if plugged in
  58         * or a negative error code */
  59        int (*get_detect)(struct gpio_runtime *rt,
  60                          enum notify_type type);
  61};
  62
  63struct gpio_notification {
  64        struct delayed_work work;
  65        notify_func_t notify;
  66        void *data;
  67        void *gpio_private;
  68        struct mutex mutex;
  69};
  70
  71struct gpio_runtime {
  72        /* to be assigned by fabric */
  73        struct device_node *node;
  74        /* since everyone needs this pointer anyway... */
  75        struct gpio_methods *methods;
  76        /* to be used by the gpio implementation */
  77        int implementation_private;
  78        struct gpio_notification headphone_notify;
  79        struct gpio_notification line_in_notify;
  80        struct gpio_notification line_out_notify;
  81};
  82
  83#endif /* __AOA_GPIO_H */
  84
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