LXR linux/sound/aoa/aoa-gpio.h

   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
  38        int (*get_headphone)(struct gpio_runtime *rt);
  39        int (*get_speakers)(struct gpio_runtime *rt);
  40        int (*get_lineout)(struct gpio_runtime *rt);
  41
  42        void (*set_hw_reset)(struct gpio_runtime *rt, int on);
  43
  44        /* use this to be notified of any events. The notification
  45         * function is passed the data, and is called in process
  46         * context by the use of schedule_work.
  47         * The interface for it is that setting a function to NULL
  48         * removes it, and they return 0 if the operation succeeded,
  49         * and -EBUSY if the notification is already assigned by
  50         * someone else. */
  51        int (*set_notify)(struct gpio_runtime *rt,
  52                          enum notify_type type,
  53                          notify_func_t notify,
  54                          void *data);
  55        /* returns 0 if not plugged in, 1 if plugged in
  56         * or a negative error code */
  57        int (*get_detect)(struct gpio_runtime *rt,
  58                          enum notify_type type);
  59};
  60
  61struct gpio_notification {
  62        struct delayed_work work;
  63        notify_func_t notify;
  64        void *data;
  65        void *gpio_private;
  66        struct mutex mutex;
  67};
  68
  69struct gpio_runtime {
  70        /* to be assigned by fabric */
  71        struct device_node *node;
  72        /* since everyone needs this pointer anyway... */
  73        struct gpio_methods *methods;
  74        /* to be used by the gpio implementation */
  75        int implementation_private;
  76        struct gpio_notification headphone_notify;
  77        struct gpio_notification line_in_notify;
  78        struct gpio_notification line_out_notify;
  79};
  80
  81#endif /* __AOA_GPIO_H */
  82