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
  15 typedef void (*notify_func_t)(void *data);
  16
  17 enum notify_type {
  18         AOA_NOTIFY_HEADPHONE,
  19         AOA_NOTIFY_LINE_IN,
  20         AOA_NOTIFY_LINE_OUT,
  21 };
  22
  23 struct gpio_runtime;
  24 struct 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
  61 struct 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
  69 struct 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 */