/*
   * 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);
  	void (*set_master)(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);
  	int (*get_master)(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 */