text: /*
   * Interface the generic pinconfig portions of the pinctrl subsystem
   *
   * Copyright (C) 2011 ST-Ericsson SA
   * Written on behalf of Linaro for ST-Ericsson
   * This interface is used in the core to keep track of pins.
   *
   * Author: Linus Walleij <linus.walleij@linaro.org>
   *
   * License terms: GNU General Public License (GPL) version 2
   */
  #ifndef __LINUX_PINCTRL_PINCONF_GENERIC_H
  #define __LINUX_PINCTRL_PINCONF_GENERIC_H
  /*
   * You shouldn't even be able to compile with these enums etc unless you're
   * using generic pin config. That is why this is defined out.
   */
  #ifdef CONFIG_GENERIC_PINCONF
  
  /**
   * enum pin_config_param - possible pin configuration parameters
   * @PIN_CONFIG_BIAS_DISABLE: disable any pin bias on the pin, a
   *	transition from say pull-up to pull-down implies that you disable
   *	pull-up in the process, this setting disables all biasing.
   * @PIN_CONFIG_BIAS_HIGH_IMPEDANCE: the pin will be set to a high impedance
   *	mode, also know as "third-state" (tristate) or "high-Z" or "floating".
   *	On output pins this effectively disconnects the pin, which is useful
   *	if for example some other pin is going to drive the signal connected
   *	to it for a while. Pins used for input are usually always high
   *	impedance.
   * @PIN_CONFIG_BIAS_BUS_HOLD: the pin will be set to weakly latch so that it
   *	weakly drives the last value on a tristate bus, also known as a "bus
   *	holder", "bus keeper" or "repeater". This allows another device on the
   *	bus to change the value by driving the bus high or low and switching to
   *	tristate. The argument is ignored.
   * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
   *	impedance to VDD). If the argument is != 0 pull-up is enabled,
   *	if it is 0, pull-up is total, i.e. the pin is connected to VDD.
   * @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
   *	impedance to GROUND). If the argument is != 0 pull-down is enabled,
   *	if it is 0, pull-down is total, i.e. the pin is connected to GROUND.
   * @PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: the pin will be pulled up or down based
   *	on embedded knowledge of the controller hardware, like current mux
   *	function. The pull direction and possibly strength too will normally
   *	be decided completely inside the hardware block and not be readable
   *	from the kernel side.
   *	If the argument is != 0 pull up/down is enabled, if it is 0, the
   *	configuration is ignored. The proper way to disable it is to use
   *	@PIN_CONFIG_BIAS_DISABLE.
   * @PIN_CONFIG_DRIVE_PUSH_PULL: the pin will be driven actively high and
   *	low, this is the most typical case and is typically achieved with two
   *	active transistors on the output. Setting this config will enable
   *	push-pull mode, the argument is ignored.
   * @PIN_CONFIG_DRIVE_OPEN_DRAIN: the pin will be driven with open drain (open
   *	collector) which means it is usually wired with other output ports
   *	which are then pulled up with an external resistor. Setting this
   *	config will enable open drain mode, the argument is ignored.
   * @PIN_CONFIG_DRIVE_OPEN_SOURCE: the pin will be driven with open source
   *	(open emitter). Setting this config will enable open source mode, the
   *	argument is ignored.
   * @PIN_CONFIG_DRIVE_STRENGTH: the pin will sink or source at most the current
   *	passed as argument. The argument is in mA.
   * @PIN_CONFIG_INPUT_ENABLE: enable the pin's input.  Note that this does not
   *	affect the pin's ability to drive output.  1 enables input, 0 disables
   *	input.
   * @PIN_CONFIG_INPUT_SCHMITT_ENABLE: control schmitt-trigger mode on the pin.
   *      If the argument != 0, schmitt-trigger mode is enabled. If it's 0,
   *      schmitt-trigger mode is disabled.
   * @PIN_CONFIG_INPUT_SCHMITT: this will configure an input pin to run in
   *	schmitt-trigger mode. If the schmitt-trigger has adjustable hysteresis,
   *	the threshold value is given on a custom format as argument when
   *	setting pins to this mode.
   * @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
   *	which means it will wait for signals to settle when reading inputs. The
   *	argument gives the debounce time in usecs. Setting the
   *	argument to zero turns debouncing off.
   * @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
   *	supplies, the argument to this parameter (on a custom format) tells
   *	the driver which alternative power source to use.
   * @PIN_CONFIG_SLEW_RATE: if the pin can select slew rate, the argument to
   *	this parameter (on a custom format) tells the driver which alternative
   *	slew rate to use.
   * @PIN_CONFIG_LOW_POWER_MODE: this will configure the pin for low power
   *	operation, if several modes of operation are supported these can be
   *	passed in the argument on a custom form, else just use argument 1
   *	to indicate low power mode, argument 0 turns low power mode off.
   * @PIN_CONFIG_OUTPUT: this will configure the pin as an output. Use argument
   *	1 to indicate high level, argument 0 to indicate low level. (Please
   *	see Documentation/pinctrl.txt, section "GPIO mode pitfalls" for a
   *	discussion around this parameter.)
   * @PIN_CONFIG_END: this is the last enumerator for pin configurations, if
   *	you need to pass in custom configurations to the pin controller, use
   *	PIN_CONFIG_END+1 as the base offset.
   */
  enum pin_config_param {
  	PIN_CONFIG_BIAS_DISABLE,
  	PIN_CONFIG_BIAS_HIGH_IMPEDANCE,
  	PIN_CONFIG_BIAS_BUS_HOLD,
  	PIN_CONFIG_BIAS_PULL_UP,
  	PIN_CONFIG_BIAS_PULL_DOWN,
  	PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
  	PIN_CONFIG_DRIVE_PUSH_PULL,
  	PIN_CONFIG_DRIVE_OPEN_DRAIN,
  	PIN_CONFIG_DRIVE_OPEN_SOURCE,
  	PIN_CONFIG_DRIVE_STRENGTH,
  	PIN_CONFIG_INPUT_ENABLE,
  	PIN_CONFIG_INPUT_SCHMITT_ENABLE,
  	PIN_CONFIG_INPUT_SCHMITT,
  	PIN_CONFIG_INPUT_DEBOUNCE,
  	PIN_CONFIG_POWER_SOURCE,
  	PIN_CONFIG_SLEW_RATE,
  	PIN_CONFIG_LOW_POWER_MODE,
  	PIN_CONFIG_OUTPUT,
  	PIN_CONFIG_END = 0x7FFF,
  };
  
  /*
   * Helpful configuration macro to be used in tables etc.
   */
  #define PIN_CONF_PACKED(p, a) ((a << 16) | ((unsigned long) p & 0xffffUL))
  
  /*
   * The following inlines stuffs a configuration parameter and data value
   * into and out of an unsigned long argument, as used by the generic pin config
   * system. We put the parameter in the lower 16 bits and the argument in the
   * upper 16 bits.
   */
  
  static inline enum pin_config_param pinconf_to_config_param(unsigned long config)
  {
  	return (enum pin_config_param) (config & 0xffffUL);
  }
  
  static inline u16 pinconf_to_config_argument(unsigned long config)
  {
  	return (enum pin_config_param) ((config >> 16) & 0xffffUL);
  }
  
  static inline unsigned long pinconf_to_config_packed(enum pin_config_param param,
  						     u16 argument)
  {
  	return PIN_CONF_PACKED(param, argument);
  }
  
  #ifdef CONFIG_OF
  
  #include <linux/device.h>
  #include <linux/pinctrl/machine.h>
  struct pinctrl_dev;
  struct pinctrl_map;
  
  int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
  		struct device_node *np, struct pinctrl_map **map,
  		unsigned *reserved_maps, unsigned *num_maps,
  		enum pinctrl_map_type type);
  int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
  		struct device_node *np_config, struct pinctrl_map **map,
  		unsigned *num_maps, enum pinctrl_map_type type);
  
  static inline int pinconf_generic_dt_node_to_map_group(
  		struct pinctrl_dev *pctldev, struct device_node *np_config,
  		struct pinctrl_map **map, unsigned *num_maps)
  {
  	return pinconf_generic_dt_node_to_map(pctldev, np_config, map, num_maps,
  			PIN_MAP_TYPE_CONFIGS_GROUP);
  }
  
  static inline int pinconf_generic_dt_node_to_map_pin(
  		struct pinctrl_dev *pctldev, struct device_node *np_config,
  		struct pinctrl_map **map, unsigned *num_maps)
  {
  	return pinconf_generic_dt_node_to_map(pctldev, np_config, map, num_maps,
  			PIN_MAP_TYPE_CONFIGS_PIN);
  }
  
  #endif
  
  #endif /* CONFIG_GENERIC_PINCONF */
  
  #endif /* __LINUX_PINCTRL_PINCONF_GENERIC_H */
  