/*
   * Core private header for the pin control subsystem
   *
   * Copyright (C) 2011 ST-Ericsson SA
   * Written on behalf of Linaro for ST-Ericsson
   *
   * Author: Linus Walleij <linus.walleij@linaro.org>
   *
   * License terms: GNU General Public License (GPL) version 2
   */

  #include <linux/kref.h>

  #include <linux/mutex.h>
  #include <linux/radix-tree.h>

  #include <linux/pinctrl/pinconf.h>

  #include <linux/pinctrl/machine.h>

  
  struct pinctrl_gpio_range;

  /**
   * struct pinctrl_dev - pin control class device
   * @node: node to include this pin controller in the global pin controller list
   * @desc: the pin controller descriptor supplied when initializing this pin
   *	controller
   * @pin_desc_tree: each pin descriptor for this pin controller is stored in
   *	this radix tree

   * @pin_group_tree: optionally each pin group can be stored in this radix tree
   * @num_groups: optionally number of groups can be kept here

   * @pin_function_tree: optionally each function can be stored in this radix tree
   * @num_functions: optionally number of functions can be kept here

   * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
   *	ranges are added to this list at runtime

   * @dev: the device entry for this pin controller
   * @owner: module providing the pin controller, used for refcounting
   * @driver_data: driver data for drivers registering to the pin controller
   *	subsystem

   * @p: result of pinctrl_get() for this device

   * @hog_default: default state for pins hogged by this device
   * @hog_sleep: sleep state for pins hogged by this device

   * @mutex: mutex taken on each pin controller specific action

   * @device_root: debugfs root for this device

   */
  struct pinctrl_dev {
  	struct list_head node;
  	struct pinctrl_desc *desc;
  	struct radix_tree_root pin_desc_tree;

  #ifdef CONFIG_GENERIC_PINCTRL_GROUPS

  	struct radix_tree_root pin_group_tree;
  	unsigned int num_groups;

  #endif

  #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
  	struct radix_tree_root pin_function_tree;
  	unsigned int num_functions;
  #endif

  	struct list_head gpio_ranges;

  	struct device *dev;

  	struct module *owner;
  	void *driver_data;

  	struct pinctrl *p;

  	struct pinctrl_state *hog_default;
  	struct pinctrl_state *hog_sleep;

  	struct mutex mutex;

  #ifdef CONFIG_DEBUG_FS
  	struct dentry *device_root;
  #endif

  };
  
  /**
   * struct pinctrl - per-device pin control state holder
   * @node: global list node
   * @dev: the device using this pin control handle

   * @states: a list of states for this device
   * @state: the current state

   * @dt_maps: the mapping table chunks dynamically parsed from device tree for
   *	this device, if any

   * @users: reference count

   */
  struct pinctrl {
  	struct list_head node;
  	struct device *dev;

  	struct list_head states;
  	struct pinctrl_state *state;

  	struct list_head dt_maps;

  	struct kref users;

  };
  
  /**
   * struct pinctrl_state - a pinctrl state for a device

   * @node: list node for struct pinctrl's @states field

   * @name: the name of this state
   * @settings: a list of settings for this state
   */
  struct pinctrl_state {
  	struct list_head node;
  	const char *name;

  	struct list_head settings;
  };
  
  /**

   * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
   * @group: the group selector to program
   * @func: the function selector to program
   */
  struct pinctrl_setting_mux {
  	unsigned group;
  	unsigned func;
  };
  
  /**
   * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
   * @group_or_pin: the group selector or pin ID to program
   * @configs: a pointer to an array of config parameters/values to program into
   *	hardware. Each individual pin controller defines the format and meaning
   *	of config parameters.
   * @num_configs: the number of entries in array @configs
   */
  struct pinctrl_setting_configs {
  	unsigned group_or_pin;
  	unsigned long *configs;
  	unsigned num_configs;
  };
  
  /**

   * struct pinctrl_setting - an individual mux or config setting

   * @node: list node for struct pinctrl_settings's @settings field

   * @type: the type of setting

   * @pctldev: pin control device handling to be programmed. Not used for
   *   PIN_MAP_TYPE_DUMMY_STATE.

   * @dev_name: the name of the device using this state

   * @data: Data specific to the setting type

   */
  struct pinctrl_setting {
  	struct list_head node;

  	enum pinctrl_map_type type;

  	struct pinctrl_dev *pctldev;

  	const char *dev_name;

  	union {
  		struct pinctrl_setting_mux mux;
  		struct pinctrl_setting_configs configs;
  	} data;

  };
  
  /**
   * struct pin_desc - pin descriptor for each physical pin in the arch
   * @pctldev: corresponding pin control device
   * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
   *	datasheet or such

   * @dynamic_name: if the name of this pin was dynamically allocated

   * @drv_data: driver-defined per-pin data. pinctrl core does not touch this

   * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.

   *	If non-zero, this pin is claimed by @owner. This field is an integer
   *	rather than a boolean, since pinctrl_get() might process multiple
   *	mapping table entries that refer to, and hence claim, the same group
   *	or pin, and each of these will increment the @usecount.

   * @mux_owner: The name of device that called pinctrl_get().

   * @mux_setting: The most recent selected mux setting for this pin, if any.

   * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is
   *	the name of the GPIO that "owns" this pin.

   */
  struct pin_desc {
  	struct pinctrl_dev *pctldev;

  	const char *name;

  	bool dynamic_name;

  	void *drv_data;

  	/* These fields only added when supporting pinmux drivers */
  #ifdef CONFIG_PINMUX

  	unsigned mux_usecount;
  	const char *mux_owner;

  	const struct pinctrl_setting_mux *mux_setting;

  	const char *gpio_owner;

  #endif
  };

  /**

   * struct pinctrl_maps - a list item containing part of the mapping table
   * @node: mapping table list node
   * @maps: array of mapping table entries
   * @num_maps: the number of entries in @maps
   */
  struct pinctrl_maps {
  	struct list_head node;

  	const struct pinctrl_map *maps;

  	unsigned num_maps;
  };
  
  #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
  
  /**

   * struct group_desc - generic pin group descriptor
   * @name: name of the pin group
   * @pins: array of pins that belong to the group
   * @num_pins: number of pins in the group
   * @data: pin controller driver specific data
   */
  struct group_desc {
  	const char *name;
  	int *pins;
  	int num_pins;
  	void *data;
  };

  int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev);
  
  const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
  					   unsigned int group_selector);
  
  int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
  				   unsigned int group_selector,
  				   const unsigned int **pins,
  				   unsigned int *npins);
  
  struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
  					     unsigned int group_selector);
  
  int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
  			      int *gpins, int ngpins, void *data);
  
  int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
  				 unsigned int group_selector);
  
  static inline int
  pinctrl_generic_remove_last_group(struct pinctrl_dev *pctldev)
  {
  	return pinctrl_generic_remove_group(pctldev, pctldev->num_groups - 1);
  }

  #endif	/* CONFIG_GENERIC_PINCTRL_GROUPS */

  struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);

  struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);

  int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);

  const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);

  int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
  			       const char *pin_group);

  
  static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
  					    unsigned int pin)
  {
  	return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
  }

  extern struct pinctrl_gpio_range *
  pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
  					unsigned int pin);

  int pinctrl_register_map(const struct pinctrl_map *maps, unsigned num_maps,

  			 bool dup);

  void pinctrl_unregister_map(const struct pinctrl_map *map);

  extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
  extern int pinctrl_force_default(struct pinctrl_dev *pctldev);

  extern struct mutex pinctrl_maps_mutex;

  extern struct list_head pinctrl_maps;
  
  #define for_each_maps(_maps_node_, _i_, _map_) \
  	list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
  		for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
  			_i_ < _maps_node_->num_maps; \
  			_i_++, _map_ = &_maps_node_->maps[_i_])