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kernel/linux-imx6_3.14.28/include/linux/pinctrl/pinmux.h 3.83 KB
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  /*
   * Interface the pinmux subsystem
   *
   * Copyright (C) 2011 ST-Ericsson SA
   * Written on behalf of Linaro for ST-Ericsson
   * Based on bits of regulator core, gpio core and clk core
   *
   * Author: Linus Walleij <linus.walleij@linaro.org>
   *
   * License terms: GNU General Public License (GPL) version 2
   */
  #ifndef __LINUX_PINCTRL_PINMUX_H
  #define __LINUX_PINCTRL_PINMUX_H
  
  #include <linux/list.h>
  #include <linux/seq_file.h>
  #include <linux/pinctrl/pinctrl.h>
  
  #ifdef CONFIG_PINMUX
  
  struct pinctrl_dev;
  
  /**
   * struct pinmux_ops - pinmux operations, to be implemented by pin controller
   * drivers that support pinmuxing
   * @request: called by the core to see if a certain pin can be made
   *	available for muxing. This is called by the core to acquire the pins
   *	before selecting any actual mux setting across a function. The driver
   *	is allowed to answer "no" by returning a negative error code
   * @free: the reverse function of the request() callback, frees a pin after
   *	being requested
   * @get_functions_count: returns number of selectable named functions available
   *	in this pinmux driver
   * @get_function_name: return the function name of the muxing selector,
   *	called by the core to figure out which mux setting it shall map a
   *	certain device to
   * @get_function_groups: return an array of groups names (in turn
   *	referencing pins) connected to a certain function selector. The group
   *	name can be used with the generic @pinctrl_ops to retrieve the
   *	actual pins affected. The applicable groups will be returned in
   *	@groups and the number of groups in @num_groups
   * @enable: enable a certain muxing function with a certain pin group. The
   *	driver does not need to figure out whether enabling this function
   *	conflicts some other use of the pins in that group, such collisions
   *	are handled by the pinmux subsystem. The @func_selector selects a
   *	certain function whereas @group_selector selects a certain set of pins
   *	to be used. On simple controllers the latter argument may be ignored
   * @disable: disable a certain muxing selector with a certain pin group
   * @gpio_request_enable: requests and enables GPIO on a certain pin.
   *	Implement this only if you can mux every pin individually as GPIO. The
   *	affected GPIO range is passed along with an offset(pin number) into that
   *	specific GPIO range - function selectors and pin groups are orthogonal
   *	to this, the core will however make sure the pins do not collide.
   * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
   *	@gpio_request_enable
   * @gpio_set_direction: Since controllers may need different configurations
   *	depending on whether the GPIO is configured as input or output,
   *	a direction selector function may be implemented as a backing
   *	to the GPIO controllers that need pin muxing.
   */
  struct pinmux_ops {
  	int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
  	int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
  	int (*get_functions_count) (struct pinctrl_dev *pctldev);
  	const char *(*get_function_name) (struct pinctrl_dev *pctldev,
  					  unsigned selector);
  	int (*get_function_groups) (struct pinctrl_dev *pctldev,
  				  unsigned selector,
  				  const char * const **groups,
  				  unsigned * const num_groups);
  	int (*enable) (struct pinctrl_dev *pctldev, unsigned func_selector,
  		       unsigned group_selector);
  	void (*disable) (struct pinctrl_dev *pctldev, unsigned func_selector,
  			 unsigned group_selector);
  	int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
  				    struct pinctrl_gpio_range *range,
  				    unsigned offset);
  	void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
  				   struct pinctrl_gpio_range *range,
  				   unsigned offset);
  	int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
  				   struct pinctrl_gpio_range *range,
  				   unsigned offset,
  				   bool input);
  };
  
  #endif /* CONFIG_PINMUX */
  
  #endif /* __LINUX_PINCTRL_PINMUX_H */