sound/aoa/aoa-gpio.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Apple Onboard Audio GPIO definitions
   4  *
   5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   6  */
   7
   8 #ifndef __AOA_GPIO_H
   9 #define __AOA_GPIO_H
  10 #include <linux/workqueue.h>
  11 #include <linux/mutex.h>
  12 #include <asm/prom.h>
  13
  14 typedef void (*notify_func_t)(void *data);
  15
  16 enum notify_type {
  17         AOA_NOTIFY_HEADPHONE,
  18         AOA_NOTIFY_LINE_IN,
  19         AOA_NOTIFY_LINE_OUT,
  20 };
  21
  22 struct gpio_runtime;
  23 struct gpio_methods {
  24         /* for initialisation/de-initialisation of the GPIO layer */
  25         void (*init)(struct gpio_runtime *rt);
  26         void (*exit)(struct gpio_runtime *rt);
  27
  28         /* turn off headphone, speakers, lineout */
  29         void (*all_amps_off)(struct gpio_runtime *rt);
  30         /* turn headphone, speakers, lineout back to previous setting */
  31         void (*all_amps_restore)(struct gpio_runtime *rt);
  32
  33         void (*set_headphone)(struct gpio_runtime *rt, int on);
  34         void (*set_speakers)(struct gpio_runtime *rt, int on);
  35         void (*set_lineout)(struct gpio_runtime *rt, int on);
  36         void (*set_master)(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         int (*get_master)(struct gpio_runtime *rt);
  42
  43         void (*set_hw_reset)(struct gpio_runtime *rt, int on);
  44
  45         /* use this to be notified of any events. The notification
  46          * function is passed the data, and is called in process
  47          * context by the use of schedule_work.
  48          * The interface for it is that setting a function to NULL
  49          * removes it, and they return 0 if the operation succeeded,
  50          * and -EBUSY if the notification is already assigned by
  51          * someone else. */
  52         int (*set_notify)(struct gpio_runtime *rt,
  53                           enum notify_type type,
  54                           notify_func_t notify,
  55                           void *data);
  56         /* returns 0 if not plugged in, 1 if plugged in
  57          * or a negative error code */
  58         int (*get_detect)(struct gpio_runtime *rt,
  59                           enum notify_type type);
  60 };
  61
  62 struct gpio_notification {
  63         struct delayed_work work;
  64         notify_func_t notify;
  65         void *data;
  66         void *gpio_private;
  67         struct mutex mutex;
  68 };
  69
  70 struct gpio_runtime {
  71         /* to be assigned by fabric */
  72         struct device_node *node;
  73         /* since everyone needs this pointer anyway... */
  74         struct gpio_methods *methods;
  75         /* to be used by the gpio implementation */
  76         int implementation_private;
  77         struct gpio_notification headphone_notify;
  78         struct gpio_notification line_in_notify;
  79         struct gpio_notification line_out_notify;
  80 };
  81
  82 #endif /* __AOA_GPIO_H */